All Lelifi tools
Every tool on the site, grouped by what it does. 1663 tools in 18 categories, all free, all running in your browser.
Automotive
- 20/4/10 Rule Calculator The 20/4/10 rule: 20% down, a 4 year loan and total car costs under 10% of income. Enter your income to see th
- BMW Monthly Payment Calculator See the monthly payment on a new BMW 3 Series, X3 or X5 after tax, down payment and trade-in, with total inter
- Brake Pad Life Calculator Free brake pad life calculator: enter your pad thickness, miles driven and driving style to estimate the miles
- CC to HP Calculator Estimate horsepower from engine cc with divisors for utility, car, turbo and race engines, plus a reverse hp t
- Capitalized Cost Calculator Work out gross and adjusted capitalized cost on a car lease, then see how the residual and term set your month
- Car Affordability Calculator See how much car you can afford with the 20/4/10 rule: 20% down, a 4-year loan and a payment under 10% of inco
- Car Depreciation Calculator See what your car will be worth after 1 to 10 years, how much value it loses each year, and the real monthly a
- Car Insurance Cost Estimator Estimate your annual premium from a base rate, then see what age, record, coverage limits and deductible do to
- Car Lease vs Buy Calculator Compare leasing and buying the same car: monthly payment, total cost after resale, mileage overage, and the ye
- Car Payment Calculator Estimate a monthly car payment from price, down payment, trade-in, sales tax, fees and APR. See total interest
- Compression Height Calculator Enter block deck height, crank stroke and rod length to get the piston compression height you need, plus deck
- Cost Per Mile to Drive Calculator Work out what your car costs per mile: fuel, insurance, maintenance, tires, registration and depreciation, tot
- Cost To Drive Calculator Work out what a single trip costs in fuel, wear and tolls. Enter the distance, your MPG and the gas price to s
- EV Charging Cost Calculator See what it costs to charge an EV at home and on public fast chargers. Enter battery size, your electric rate
- EV vs Gas Cost Calculator Compare the yearly energy cost of an EV and a gas car. Enter your miles, gas price and electricity rate to see
- Electric Vehicle Charging Cost Calculator Calculate your electric vehicle charging cost per full charge, per 100 miles, and per month. Compare home char
- Electric Vehicle Fuel Savings Calculator Compare an EV with a gas car by cost per mile, including charging losses, then see annual savings and how many
- Engine Displacement Calculator Work out engine displacement from bore, stroke and cylinder count. Get cubic inches, liters and cc, plus overb
- Engine Horsepower Calculator Calculate engine horsepower from torque and rpm or from displacement and BMEP, with gross versus net ratings,
- Engine Hours to Miles Converter Convert engine hours to equivalent miles for trucks and heavy equipment. Split idle from running hours and app
- Engine Torque Calculator Convert crank torque and rpm into horsepower, then run it through the gears to see wheel torque, thrust at the
- Fuel Cost Calculator Enter miles per year, MPG, gas price and tank size to see your yearly and monthly fuel cost, the price of a fi
- Fuel Cost Per Mile Calculator Work out your fuel cost per mile from gas price and MPG. See cents per mile, trip cost and yearly fuel spend,
- Fuel Economy Converter Convert MPG, L/100km, km/L and UK mpg in one place, and see why the scales run backwards and why 5 mpg at 20 m
- Fuel Mileage Calculator Calculate fuel mileage from miles driven and gallons used. See MPG, L/100km, cost per mile, and your yearly ga
- Gas Cost Calculator Enter trip miles, your car MPG and the local gas price to get total fuel cost, gallons burned and cost per mil
- Gas Mileage Calculator Work out real MPG from miles driven and gallons pumped. See gallons per 100 miles, cost per mile and how your
- Horsepower Calculator Turn torque and rpm into horsepower with the 5,252 formula, subtract drivetrain loss, then check the result ag
- How Much Does a Brake Job Cost? See what brake pads, pads and rotors, or a full brake job cost per axle in 2026, and why the quote moves with
- How Much Does a New Set of Tires Cost Four new tires cost $730 to $1,350 installed in 2026. See tire prices by tier, mount and balance, TPMS sensors
- How Much Does an Oil Change Cost A conventional oil change runs about $45 and full synthetic $75 to $110. Compare dealer, quick lube and DIY pr
- Kilometers per Liter Fuel Economy Calculator Convert km per liter to L/100km and US MPG, see why the two metric units run in opposite directions, and work
- Lease Mileage Calculator Check lease mileage against the annual allowance, project the turn-in odometer and price the overage fee at 0.
- Maintenance Cost Calculator Add up oil changes, tires, brakes, scheduled service and repairs by the mile, then see the yearly, monthly and
- Mileage Reimbursement Calculator and Tax Rules Guide Calculate business mileage reimbursements using official IRS standard mileage rates. Compare accountable plans
- Oil Change Interval Calculator See when your next oil change is due by miles and months, with intervals cut for short trips and towing, for c
- Out the Door Price Calculator Work out the out the door price of a car: negotiated price minus trade in, plus sales tax, doc fee and title f
- Parking Distance Calculator Parking distance calculator: enter lot size, stall dimensions and aisle width to see how many spaces fit, squa
- Power to Weight Ratio Calculator Calculate the power to weight ratio from any power and weight units and read it as W/kg, kW/kg, hp per US ton,
- Tire Diameter Calculator Free tire diameter calculator: enter a size like 225/45R17 to get sidewall height, overall diameter in inches
- Tire Pressure Calculator Free tire pressure calculator: convert PSI, kPa and bar, and adjust your door-sticker pressure for temperature
- Tire Size Calculator Decode a size like 225/45R17 into sidewall height, overall diameter, circumference and revs per mile, with loa
- Tire Size Comparison Calculator Compare any two tire sizes: sidewall, diameter, circumference and the exact speedometer error. See why a chang
- Toll Calculator Work out what a toll road costs per mile and per year: pick your road, enter your miles and see the gap betwee
- Torque Calculator Convert torque between lb-ft, lb-in and Nm, or find the torque behind any hp and rpm figure, with worked wrenc
- Towing Capacity Calculator Work out the real trailer weight your truck can handle from GCWR, GVWR, payload and tongue weight, and see whi
- Trailer Tongue Weight Calculator Free trailer tongue weight calculator: enter your loaded trailer weight and see the safe 10-15% range, plus wh
- Trailer Weight Calculator Add your trailer, cargo and tongue weight to see if your tow vehicle can safely pull the load, and how much pa
- Uber vs Drive Calculator Compare a ride fare with tip against the true cost of driving, using the 2026 IRS rate of 72.5 cents a mile pl
- Used Car Value Calculator Estimate what your used car is worth: apply a depreciation curve to the original sticker, adjust for miles, an
- Vehicle Registration Fee Calculator Estimate your annual car registration renewal by state, whether your state prices it by value, weight or age,
- Wheel Offset Calculator Convert wheel offset in millimeters to backspacing in inches, and see how a wider or differently offset wheel
Converters
- 12 Hour to 24 Hour Converter Calculator Convert 12 hour clock times to 24 hour time and back. The 12 AM and 12 PM rules, a full hour chart, and a free
- Acres to Hectares Converter Convert acres to hectares and back with the exact NIST factor: 1 acre = 0.40468564224 ha. See square feet, squ
- Acres to Linear Feet Calculator Convert acres to linear feet and perimeter. A 1-acre square has 208.71-foot sides and an 834.84-foot perimeter
- Acres to Square Feet Converter Convert acres to square feet and sq ft to acres instantly. 1 acre equals exactly 43,560 square feet. Includes
- Activation Energy Calculator Find activation energy from two rate constants and temperatures with the two point Arrhenius equation, or pred
- Air Density Calculator Find air density from temperature, pressure, humidity or altitude in kg/m3 and lb/ft3, plus density altitude a
- Amps to Watts Calculator Convert amps to watts for DC, single phase and three phase AC. Enter current, voltage and power factor to get
- Angle Converter Convert any angle between degrees, radians, gradians, turns, arcminutes, arcseconds and NATO mils, with the ex
- Angle of Depression Calculator Find the angle of depression from a height difference and a level distance, or work backward to get the height
- Angle of Elevation Calculator Enter rise and run to get the angle of elevation in degrees, plus grade percent and ramp length, with ADA, OSH
- Area Calculator Find the area of a rectangle, circle, triangle, trapezoid or parallelogram in square feet, inches, yards or me
- Area Converter Convert square feet, square meters, acres, hectares and square miles with exact factors, plus price per square
- BPM to FPS Calculator Convert beats per minute to frames per second for animation timing. Enter BPM and frames per beat, or work bac
- BPM to Hz Calculator Convert BPM to Hz and back. 120 BPM is 2 Hz, 90 BPM is 1.5 Hz, and 140 BPM is 2.3333 Hz. See beat length in mi
- BPS to Hz Calculator Convert bits per second to hertz for any modulation. Nyquist bandwidth, baud rate, roll-off examples and a bps
- BTU per Hour to Tons Converter Convert BTU per hour to tons of cooling by dividing by 12,000, with tables, square foot sizing rules, SEER2 ru
- Billions to Trillions Converter Convert billions to trillions and back: 1 trillion is 1,000 billion on the short scale, 1,000,000 billion on t
- Celsius to Fahrenheit Converter Free Celsius to Fahrenheit converter. Type °C and get °F instantly (F = C × 9/5 + 32), with a chart for 0, 20,
- Celsius to Kelvin Converter Convert Celsius to Kelvin by adding 273.15, with a chart for 0, 25, 37 and 100 °C, absolute zero at 0 K, and t
- Celsius to Rankine Converter Convert Celsius to Rankine with the exact formula: multiply by 9/5 and add 491.67. 0 °C is 491.67 °R and 100 °
- Centimeters to Inches Converter Convert centimeters to inches instantly. 1 cm = 0.3937 in. Free converter with a cm-to-inch chart and worked e
- Conversion Calculator Convert length, weight, volume, temperature and speed with exact factors: inches to cm, pounds to kg, gallons
- Coterminal Angle Calculator Find coterminal angles in degrees or radians: normalize into 0 to 360, list the nearest turns, and read the qu
- Days Until Calculator Count the days until any date, with weeks, business days and US federal holidays, then work backward to the la
- Density Calculator Find density from mass and volume, or get the weight of water, concrete, steel or aluminum in pounds, gallons
- Density Converter Convert density between kg/m3, g/cm3, kg/L, lb/ft3, lb/in3 and lb per gallon in one step, with water, air and
- Dimensional Analysis Calculator Convert length, mass, pressure, speed and more with exact NIST factors, and see every conversion ratio in the
- Diopter to mm Calculator Turn diopters into focal length in mm and inches, add stacked close-up filters, and shift a glasses prescripti
- Displacement Calculator Find displacement from speed and time, or from acceleration, in meters, miles, feet and kilometers, plus stopp
- Double Angle Calculator Get sin 2 theta, cos 2 theta and tan 2 theta from any angle in degrees or radians, or solve cos 2 theta and si
- Draw Length Calculator Estimate bow draw length from your wingspan with both standard formulas, convert to the AMO scale, and get an
- Fahrenheit to Celsius Converter Free Fahrenheit to Celsius converter. Enter °F and get °C instantly (C = (F − 32) × 5/9), with a chart for 32,
- Fahrenheit to Kelvin Converter Convert Fahrenheit to kelvin with K = (°F - 32) × 5/9 + 273.15. 32 °F is 273.15 K and 98.6 °F is 310.15 K, wit
- Fahrenheit to Rankine Converter Convert Fahrenheit to Rankine by adding 459.67. 32 °F is 491.67 °R and 212 °F is 671.67 °R, with kelvin cross
- Fahrenheit: The Scale, Its History and Its Conversions What the Fahrenheit scale is, why water freezes at 32 F and boils at 212 F, who still uses it, and the formula
- Feet to MPH Calculator Convert feet per second to mph and mph to feet per second instantly. 1 ft/s = 0.681818 mph and 60 mph = 88 ft/
- Feet to Meters Converter Convert feet to meters instantly. 1 foot = 0.3048 m exactly. Free converter with a feet-to-meter chart and wor
- Feet to kg Calculator Convert length in feet to weight in kilograms for rebar, steel pipe, wire, and beams using linear density. Sup
- GB to MB Converter Convert GB to MB instantly: 1 GB = 1,000 MB (decimal) or 1 GiB = 1,024 MiB (binary). Enter one value and see M
- GSM to MM Calculator Turn paper GSM into thickness in mm, microns, mils or points. Bulk ranges for coated, uncoated, newsprint and
- Gallons to Cubic Feet Converter Convert gallons to cubic feet and back: one cubic foot holds 7.48 US gallons, with tank volume examples and th
- Gauge to mm Calculator Convert AWG wire and sheet steel gauge numbers to millimeters, inches and square millimeters, with the exact f
- Gibbs Free Energy Calculator Enter delta H, delta S and a temperature to get delta G, the verdict on spontaneity, the crossover temperature
- Gram to Pound Converter Convert grams to pounds with the exact 453.59237 factor, plus kilograms and ounces, worked examples, and a sho
- Grams to Ounces Convert grams to ounces with the exact 28.349523125 g per ounce factor, plus troy ounces, pound and ounce brea
- Half Angle Calculator Halve any angle and get sin, cos and tan of the half angle, with the sign picked for the right quadrant and ev
- Horsepower to Kilowatts Converter Free hp to kW converter. Type mechanical horsepower and get kilowatts instantly (1 hp = 0.7457 kW), with a cha
- How Many Steps in a Mile Work out steps per mile from your height and pace. A 5 foot 7 walker takes about 2,279 steps a mile, not the 2
- IP Address Converter Convert an IPv4 address between dotted decimal, a 32-bit integer, hex, binary and IPv4-mapped IPv6, with the R
- Inch to Meter Converter Convert inches to meters with the exact 0.0254 factor, including fractional inches, feet plus inches, and mete
- Inches to Centimeters Converter Free inches to cm converter. Type any length in inches and see the exact value in centimeters instantly, plus
- Inches to Miles Convert inches to miles with the exact 63,360 factor, plus feet, yards and kilometers, worked examples and a t
- Inches to Yards Converter Convert inches to yards by dividing by 36, with cut list, sewing and garden examples plus tables from 1 inch t
- Inverting Buck-Boost Converter Calculator Size an inverting buck-boost converter: duty cycle, inductor value, peak current and switch stress, with ideal
- Katha to Square Feet Converter Convert katha to square feet and square feet to katha. Pick Bihar, West Bengal, Bangladesh, Assam, Nepal or ea
- Kelvin to Celsius Converter Convert kelvin to Celsius by subtracting 273.15, with the answer rounded the way labs, weather reports and pla
- Kelvin to Fahrenheit Converter Convert kelvin to Fahrenheit with both formulas, see the Celsius waypoint, and get reference values from liqui
- Kelvin to Rankine Converter Convert kelvin to Rankine by multiplying by 1.8. Enter any K or °R value for the other scale plus Fahrenheit a
- Kilobytes to Megabytes Converter Convert KB to MB with both the 1,000 and 1,024 scales side by side, so you can match the number your drive, ph
- Kilograms to Pounds Converter Free kg to lbs converter. Type kilograms and get pounds instantly (1 kg = 2.20462 lb), with a reference chart
- Knots to MPH Converter Free knots to mph converter. Type knots and get miles per hour instantly (1 knot = 1.15078 mph), with a chart
- Length Converter Convert meters, feet, inches, miles, kilometers, yards and nautical miles with exact factors, plus a survey fo
- Lowercase to Uppercase Converter This lowercase to uppercase converter switches text to UPPER, lower, Title Case, Sentence case or tOGGLE as yo
- MPG to L/100km Converter Free mpg to L/100km converter. Enter US mpg and get liters per 100 km instantly (L/100km = 235.214583 ÷ mpg),
- Mass Calculator Convert mass between kilograms, grams, pounds, ounces, stone and tons, see the pounds and ounces split, and ch
- Mbps to MB/s Converter Convert Mbps to MB/s in one step: divide by 8. See your real download speed, how long a file takes at that rat
- Mechanical Energy Calculator Add kinetic and potential energy in one step: ME = 0.5mv^2 + mgh, with an optional spring term. See a 2 kg obj
- Meter to Inch Converter Convert meters to inches with the exact 39.3701 factor, plus feet and inches, the nearest sixteenth, centimete
- Meter to Yard Converter Convert meters to yards with the exact 0.9144 factor. 100 m is 109.3613 yards, 10 m is 10.9361 yards, with wor
- Meters to Feet Converter Free meters to feet converter. Enter meters and get feet instantly, with a chart (1, 5, 10, 50 and 100 m) and
- Meters to Miles Convert meters to miles with the exact factor 1,609.344, plus worked examples for races, paces, cycling and od
- Metric Modulation Calculator Enter an old tempo and two note values to get the new BPM, the reduced ratio, the beat in milliseconds and the
- Mile to Meter Convert miles to meters with the exact 1,609.344 factor, plus speed in km/h and m/s, survey mile differences,
- Miles to Inches One mile is exactly 63,360 inches. Convert any mile figure to inches, feet and yards, with worked cases for fe
- Miles to Yards Converter Convert miles to yards with the exact 1,760 factor, a 0.1 to 10 mile chart, track lap counts and a clear warni
- Million to Thousand Converter Convert millions to thousands and back. One million is 1,000 thousand, so 2.5 million is 2,500 thousand. Table
- Molar Mass Calculator Type any chemical formula to get its molar mass in g/mol, the uncertainty, the percent of each element and the
- Nautical Miles to Miles Converter Free nautical miles to miles converter. Enter nautical miles and get statute miles instantly (1 nmi = 1.15078
- Newton Meters to Foot-Pounds Converter Free Nm to ft-lbs converter. Type newton meters and get foot-pounds instantly (1 N·m = 0.737562 ft·lb), with a
- Ounce to Grams Convert ounces to grams with the exact 28.349523125 factor, plus troy ounces for gold, USPS mailing limits, la
- Ounces to Pounds Converter Convert ounces to pounds with exact numbers. 16 oz make 1 lb, so 26 oz is 1.625 lb or 1 lb 10 oz, with grams,
- PSI to Bar Converter Free psi to bar converter. Type psi and get bar instantly (1 psi = 0.0689476 bar), with a chart for 1, 5, 10,
- Partial Pressure Calculator Find the partial pressure of each gas in a mixture: enter the total pressure and the shares, or moles, tempera
- Percent to Decimal Calculator Turn a percent into the decimal you multiply by: 8.25% is 0.0825, 0.5% is 0.005 and 150% is 1.5, with dollar e
- Pint to Pound Converter Convert pints to pounds by density. A US liquid pint of water weighs 1.04 lb, honey 1.48 lb, milk 1.07 lb. Swi
- Pipe Volume Calculator Enter the inside diameter and length of a pipe to get the water volume in gallons, liters and cubic feet, plus
- Population Density Calculator Divide population by land area to get people per square mile or square kilometer, plus people per acre and acr
- Pounds to Grams Converter Convert pounds to grams with the exact 453.59237 factor, plus kilograms, ounces, the nearest metric pack and t
- Pounds to Kilograms Converter Free lbs to kg converter. Enter pounds and get kilograms instantly (1 lb = 0.45359237 kg), with a chart for 1,
- Pounds to Ounces Converter Convert pounds to ounces with the exact 16 to 1 rule, plus the pounds and ounces split a scale shows, grams, k
- Pounds to Tons Converter Convert pounds to short tons, long tons and metric tonnes in one step, with exact NIST factors, Interstate tru
- Power Calculator Convert power between watts, kilowatts, horsepower, BTU per hour, tons of refrigeration and boiler horsepower,
- Power Factor Calculator Find power factor from kW and kVA or from volts and amps on single and three phase circuits, then size the kVA
- Pressure Calculator Calculate pressure three ways: force over area, depth with rho g h, or the ideal gas law, with instant results
- Pressure Converter Convert psi, bar, kPa, MPa, atm, mmHg, inHg and kg per square centimeter with exact factors, plus tire and wea
- Rankine to Celsius Converter Convert Rankine to Celsius in two steps: subtract 491.67, then multiply by 5/9. 671.67 °R is 100 °C, 0 °R is -
- Rankine to Fahrenheit Convert Rankine to Fahrenheit by subtracting 459.67, with worked examples for thermostats, ovens, freezers and
- Rankine to Kelvin Convert degrees Rankine to kelvin by dividing by 1.8, with worked examples, a fixed-point table and the temper
- Rate Constant Calculator Find the Arrhenius rate constant from A, activation energy and temperature, or solve for Ea from two rate cons
- Reference Angle Calculator Find the reference angle for any degree or radian measure, with the quadrant, the rule that was used, and the
- Scale Calculator Convert a drawing, map, or model measurement into real size. Enter a scale ratio like 1:48 or 1:24,000 and get
- Shoe Size Conversion Convert shoe sizes between US men, US women, UK, EU and centimeters using the ISO 19407 formulas, with a full
- Speed Calculator Convert mph, km/h, m/s, ft/s, knots and Mach in one step, read the speed as pace per mile and per kilometer, a
- Speed Converter for mph, km/h, m/s, ft/s, Knots and Mach Convert mph, km/h, knots, m/s, ft/s and Mach with exact NIST factors, see every unit at once, and check the ti
- Square Feet to Percentage Calculator Turn any piece of a floor plan into a percent of the whole: 120 of 1,200 square feet is 10 percent, with a tab
- Steps to Kilometers Calculator Convert steps to kilometers using your height. At 5 foot 9, 10,000 steps is about 7.27 km, and one kilometer t
- Steps to Miles Calculator Convert steps to miles and kilometers using your height and walking pace. See your stride length, steps per mi
- Stone to Pounds Converter Turn stone into pounds with the exact 14 factor, see 11 stone 4 broken down as 158 lb, a 1 to 20 stone chart,
- Stone to Pounds Converter Free stone to pounds converter. Type stones and get pounds instantly (1 stone = 14 lb), with a chart for 1, 2,
- Surface Area Calculator Find the surface area of a cube, box, sphere, cylinder, cone or pyramid in square inches, feet or meters. Tota
- Tank Volume Calculator Tank volume calculator for rectangular and cylindrical tanks: enter dimensions and a liquid depth to get gallo
- Temperature Converter Convert one temperature into Celsius, Fahrenheit, kelvin and Rankine at once, plus a mode for temperature diff
- Tons to Pounds Converter Convert tons to pounds for all three tons: 2,000 lb short, 2,240 lb long, 2,204.62 lb metric tonne. Chart, quo
- Unit Converter Convert length, weight, volume, temperature, area, speed, pressure, energy, data and time with exact NIST fact
- Unit Rate Calculator Turn two quantities into a rate per one unit, then scale it to a bigger amount or work backwards to the time a
- Volts to Joules Calculator Convert volts to joules from charge or from current and time, get capacitor energy from 0.5 C V squared, and s
- Volume Calculator Enter dimensions in inches, feet, centimeters or meters and get the volume of a box, cylinder, cone or sphere
- Water Weight Calculator Convert water volume to weight in pounds and kilograms using the density at your temperature. Gallons, liters
- Watts to Amps Calculator Turn watts into amps for DC, single phase AC and three phase AC, with power factor, plus the 125 percent rule
- Wave Speed Calculator Convert frequency and wavelength into wave speed in m/s, km/h and mph, with speeds for air, water, seawater an
- Weight Gain Calculator Plan a muscle building surplus: enter a goal weight and get daily calories, the weekly gain rate, protein targ
- Weight Watchers Points Calculator Score any food with the legacy Weight Watchers points formula: calories divided by 50, plus fat divided by 12,
- Yard to Meter Converter Convert yards to meters with the exact 1959 factor: 1 yard = 0.9144 m. Instant two way converter, a yard to me
- Yards to Inches Converter Convert yards to inches with the exact 36. Eighth yard cuts from 4.5 to 31.5 inches, fabric and carpet example
- Yards to Miles Converter Convert yards to miles and back with the exact 1,760 yard mile. Get the formula, a chart for 100 to 46,145 yar
- dBm to Watts Converter Convert dBm to watts and milliwatts with the 10^(dBm/10) formula. Chart from -20 to 50 dBm, plus the 3 dB doub
- kVA to Watts Calculator Convert kVA to watts with the power factor: 1 kVA is 1,000 W at unity. Single and three phase current, the rev
Date Time
- 1 Hour From Now 1 hour from now is the same minute on the next hour. See the 12 o'clock wrap, the 24 hour form, 3,600 seconds,
- 1 Month Notice Period Calculator Enter the day you hand in notice to get the last day of a one month period, the weekday it lands on, weekdays
- 1/8 Mile Time Calculator Turn an eighth mile ET and trap speed into average speed, acceleration, a quarter mile estimate and the power
- 10 Hours From Now 10 hours from now is your clock plus ten hours. See the sleep window it builds, the fasting gap it closes, the
- 10 Minutes Ago 10 minutes ago means the clock minus ten minutes, borrowing an hour when minutes run short. See the borrow rul
- 10 Weeks Ago From Today See the exact date 10 weeks ago from today, the weekday it landed on, the 70 day span in hours and seconds, an
- 11 Hours From Now 11 hours from now is your clock plus eleven hours. See the shift hours it covers, the meeting blocks it reache
- 12 Hours From Now 12 hours from now is half a day later: the minutes stay put and AM flips to PM. See the date line, the shift h
- 120 Days From Today See the exact date 120 days from today or any start date, the weekday it lands on, and 120 business days with
- 13 Hours From Now 13 hours from now is the same clock reading one hour on, with the AM or PM tag reversed. See the date roll, th
- 14 Days From Today See the exact date 14 days from today, the weekday it lands on, when 14 business days fall, and how two weeks
- 15 Hours From Now 15 hours from now is 900 minutes ahead. See the clock time, then run it backwards to find the departure a 15 h
- 16 Hours From Now 16 hours from now is 960 minutes ahead. See the clock time, the sleep window it closes, the 16:8 fast it match
- 17 Hours From Now 17 hours from now is 1,020 minutes ahead, or 70.83 percent of a day. See the arrival clock, the next date rule
- 18 Hours From Now 18 hours from now is 1,080 minutes ahead, three quarters of a day. Get the clock time, back plan a departure f
- 180 Days From Today See the exact date 180 days from today or any start date, the weekday it lands on, and 180 business days with
- 183 Day Rule Calculator Enter your days in the US for the last three years and get the weighted 183 day total, the 31 day check, and h
- 19 Hours From Now 19 hours from now is 1,140 minutes ahead, or 79.17 percent of a day. See the arrival clock, the 5 AM date rule
- 2 Hours From Now 2 hours from now is 120 minutes ahead, or 8.33 percent of a day. See the arrival clock, the 10:00 PM date rule
- 20 Hours From Now 20 hours from now is 1,200 minutes ahead, or 83.33 percent of a day. See the arrival clock, the 4 AM boundary
- 21 Days From Today See the exact date 21 days from today, the weekday it lands on, the hours and minutes, and when 21 business da
- 28 Days From Today See the exact date 28 days from today, which is always the same weekday, plus 28 business days, the week numbe
- 30 Days From Today See the exact date 30 days from today, plus 30 business days, the day of the week, the week number and how 30
- 45 Days From Today See the exact date 45 days from today or any start date, the weekday, 45 business days and the IRS 1031 rule t
- 60 Days From Today Calculator See the date 60 days from today and 60 days back, the weekday, the month and year crossings, and how many busi
- 90 Days From Today Calculator See the exact date 90 days from today, plus 90 business days, weeks and a custom count. Free date calculator,
- Add Days Calculator Add or subtract days from several start dates at once. Get the new date, weekday, ISO week, workdays and weeke
- Add Days to a Date Free date calculator: add or subtract any number of days from a date and see the result, the day of the week,
- Add Time Calculator Add hours, minutes and seconds for any list of spans, see the total in decimal hours and minutes, and get the
- Age Calculator Find your exact age in years, months, days, weeks, hours and minutes from your date of birth, plus a countdown
- Age Difference Calculator Enter two birthdays and get the exact age gap in years, months and days, plus total weeks and days apart, free
- Age to Birthday Calculator Find your birth date range from current age, or calculate exact dates and days remaining for upcoming mileston
- Anniversary Calculator Count how long you have been married in years, months and days, see the total days and the next anniversary da
- Average Time Calculator Enter several h:m:s timings and get the average, total, median, fastest and slowest, with each row converted t
- Baby Age Calculator Calculate your baby's age in months, weeks, and days. Get adjusted age for babies born early, current stage, w
- Birth Year Calculator Turn your age into a birth year, with the birthday cutoff handled, plus the generation range, Chinese zodiac a
- Birthday Countdown Calculator See exactly how many days, weeks and hours are left until your next birthday, the weekday it lands on, and the
- Business Days Calculator Count business days between two dates, excluding weekends and optional US federal holidays. Free, instant, and
- Calendar Calculator Draw any month as a full calendar grid with ISO week numbers and federal holiday marks, plus the first weekday
- Calendar Countdown Calculator Count the days, weeks and months between two dates, see how including the end date changes the total, and spli
- Chronological Age Calculator Turn a birth date and any reference date into exact chronological age in years, months and days, with total da
- Countdown Timer Calculator Set a countdown by length or by end time. See the total in seconds, the hh:mm:ss display and the exact clock t
- Cyber Monday Date Calculator Cyber Monday 2026 is November 30, four days after Thanksgiving. Get the date for any year and see why it moves
- Date Calculator Both directions of date math in one tool: years, months and days between two dates, plus total days, weeks and
- Date Countdown Calculator Count the days, weeks, weekdays and hours left until any target date, with inclusive or exclusive counting and
- Date of Birth Calculator Work out an exact age from a birth date, or turn an age back into the birth date range. Counts years, months,
- Day Counter Count the days between two dates, with or without the first day. Get calendar days, weeks, weekdays and weeken
- Day of the Week Calculator Get the weekday for any date, list every Monday in a month, or move a due date off the weekend, using publishe
- Day of the Year Type any date and get its day number out of 365 or 366, the days left in the year, the ISO week, and the date
- Days Between Dates Free days between dates calculator. Pick two dates and get the exact day count, weeks, weekdays, weekend days,
- Days Left in the Year Count the days left in the year from any date, see the day number, the weekdays and weekends still ahead, and
- Days Old Calculator Find how many days old you are from any start date, with weeks, hours, minutes and seconds plus the dates of 1
- Days Since Calculator Count the days, weeks and weekdays since any event date, with day zero rules, return window dates and the mone
- Days Together Calculator Count how long you have been together from your first date: days, weeks, months and hours, plus your next mile
- Days Until Christmas Count the days until Christmas 2026, see how many shopping Saturdays are left, and split a gift budget by week
- Days Until Easter Count the days until Easter 2027 on March 28, see Ash Wednesday and Good Friday dates, and split a holiday bud
- Days Until Fall 2027: Countdown to the September Equinox Count the days until fall 2027 on September 23, compare the September 1 and equinox start dates, and see how f
- Days Until Halloween Count the days until Halloween 2026, see the weekends left, and work out how many pounds of candy to buy for t
- Days Until My Birthday Free days-until-my-birthday calculator: enter your birth date to see the countdown in days, weeks and hours, p
- Days Until New Year's Day Find out exactly how many days, weeks, hours, and business days remain until New Year's Day. Track your year-e
- Days Until Summer Count the days until summer 2027 on June 21, compare the June 1 and solstice start dates, and see daylight hou
- Days Until Tax Deadline Free countdown to Tax Day 2027: see how many days, weeks and business days are left until April 15, plus every
- Days Until Thanksgiving Count the days until Thanksgiving, November 26 in 2026, plus Black Friday, Cyber Monday and New Year dates for
- Days Until Valentine's Day Valentine's Day 2027 lands on Sunday, February 14, which is 112 days from October 25, 2026. Count the days fro
- Doubling Time Calculator Find how long a value takes to double from its growth rate, work back from a doubling time to the rate, or see
- Easter Date Calculator Find the date of Easter for any year from 1583 to 4099, plus Ash Wednesday, Good Friday and Pentecost, with th
- Easter Date and the Computus That Sets It Easter falls on April 5 in 2026. See how the Meeus/Jones/Butcher computus fixes the date, why Orthodox Easter
- Elapsed Time Calculator Find the time between two clock readings in hours, minutes and seconds, plus total minutes, total seconds and
- Half Birthday Calculator Enter a birth date to get the exact half birthday, the weekday it lands on, a countdown in days and hours, and
- Hour Countdown Calculator Calculate remaining hours, minutes, and seconds to any target time or deadline. Track work shifts, fasting win
- Hours Calculator Work out the hours between two clock times, subtract a lunch break, get decimal hours for payroll, or add hour
- Hours Worked Calculator Enter your clock in and out times, an unpaid break and your rounding rule for paid hours, decimal hours and gr
- How Many Days Have I Been Alive? Enter your birth date and see exactly how many days you have been alive, plus hours and minutes, with leap yea
- How Many Days Until Calculator Count the days until any date, with or without today counted, plus the weeks, months, weekdays and business da
- How Many Days Until My Birthday? Answer how many days until my birthday in one click. Get the count in days, weeks and hours, the weekday, and
- Lead Time Calculator Free lead time calculator: add processing, transit and buffer days to an order date, or work backward from a d
- Leap Year Calculator Check any year against the 4, 100 and 400 rules, see the next leap year, count February 29 birthdays, and pric
- Marriage Calculator See how long you have been married: enter your wedding date and today and get the years and days, plus the day
- Military Time Converter Convert 12-hour clock times to military time and back, read them out loud, turn minutes into decimal hours for
- Month Calculator Count whole months between two dates or add and subtract months, with end-of-month clamping, total days, weeks
- Month Counter for Calendar Months and Days Count calendar months and leftover days between two dates, with end-of-month and leap year rules plus averages
- Months Between Dates Calculator Find how many months are between two dates. Get whole calendar months, a years-months-days breakdown and total
- Moon Phase Calculator See the moon phase, percentage lit and moon age for any date, plus the next new and full moon. Works for north
- New Year's Countdown Count down to midnight in your own time zone: from October 18, 2026 the new year is 75 days away, or 76 counti
- Pregnancy Countdown Calculator Track your pregnancy countdown by due date or last period. Calculate days left, gestational age, trimesters, a
- Reading Time Calculator Estimate how long a text takes to read. Paste your text or enter a word count, pick a reading speed, and get t
- Speed Distance Time Calculator Solve for distance, speed or time from the other two, convert mph, km/h, m/s and knots, and get pace in minute
- Stopwatch A free online stopwatch with start, stop, lap and reset. It reads in hours, minutes, seconds and hundredths an
- Sunrise and Sunset Calculator Get sunrise, sunset, day length and all three twilight times for any latitude and date. New York on June 21 ge
- Thanksgiving Date and Planning Calculator Find the Thanksgiving date for any year, count the days remaining, and plan turkey thawing and roasting times
- Time Calculator Add or subtract hours, minutes and seconds across several time spans. Get the total as hh:mm:ss and decimal ho
- Time Difference Calculator Find the exact hour gap between two time zones on any date, see what 9 a.m. Eastern is on their clock, and get
- Time Dilation Calculator Enter a speed and an elapsed time to get the Lorentz factor, the clock reading on the moving object, and the g
- Time Duration Calculator Enter a start and end date and time to get the exact duration in days, hours and minutes, plus the same span i
- Time Span Calculator Enter two dates and times to see one span in years, months, days, weeks, hours, minutes and seconds, plus week
- Time Until Calculator Count the time until any date and clock time. Get a live countdown in days, hours, minutes and seconds, plus t
- Time Zone Calculator Convert a local date and time between 17 world zones through UTC, with 2026 daylight saving rules for the US,
- Time to Hours Calculator Convert any stretch of time to hours: minutes, seconds, days and clock times become decimal hours, with work s
- Time to Minutes Calculator Turn 2 hours 15 minutes 30 seconds into 135.5 minutes. Convert hh:mm:ss to total minutes, decimal hours and se
- Today's Date Today's date with the weekday, the day number out of 365 or 366, the ISO week, the days left in the year, and
- Travel Time Calculator Enter distance, average speed and stops to get driving time, door to door time, arrival on both clocks and the
- Vacation Countdown Calculator Calculate days, workdays, weekends, and hours until your vacation departure. Track travel milestones, passport
- Week Calculator Count the whole weeks and leftover days between two dates, add or subtract weeks, and see the ISO week number
- Week Number 2026 Find the week number for any date in 2026. See the ISO week, the Monday and Sunday that bound it, day of year
- Week Number Calculator Find the ISO 8601 week number for any date, or the Monday to Sunday dates for any week of any year, with worki
- Weekday Calculator Find the weekday for any date, plus the day of the year, ISO week and leap year check. October 17, 2026 is a S
- Weeks Between Dates Calculator Find the weeks and days between any two dates, with working days, weekend days, fractional weeks, and inclusiv
- Weeks Calculator Count the weeks between two dates, add or subtract weeks, and see why a year is 52.1775 weeks, with 53 week ye
- Weeks Left in the Year See how many weeks are left in 2026 from any date, which ISO week you are in, the whole weeks remaining, and t
- What Day Is It? Find out what day of the week any date falls on, its day of the year, the ISO week number, the quarter and how
- What Day Was I Born? Enter a birth date to see the weekday, the day of the year, the week number, and how many days and weeks old y
- What Day Will It Be in 100 Days? Find the exact date and weekday 100 days from today or from any start date. Includes ISO week, quarter, busine
- Work Hours Calculator Enter clock-in, clock-out and unpaid lunch per day to get decimal hours, weekly totals, overtime past 40 hours
- Working Days Calculator Count the working days between two dates, skip weekends and federal holidays, then add working days to a date
- Years Ago Calculator Find the date a number of years back, or the whole years between two dates, with the weekday, the day count an
- Years Between Two Dates Calculator Free years between two dates calculator: enter any two dates and see the exact years, months and days apart, p
Design
- Aspect Ratio Calculator Enter a width and height to get the exact aspect ratio, the decimal form and the height that keeps the same sh
- Color Contrast Checker Check the contrast ratio between any two colors and see instantly whether they pass WCAG AA or AAA for normal
- Color Picker and Contrast Checker Pick a color and read it as HEX, RGB and HSL, then see its contrast ratio against white and black and whether
- Crop Factor and Equivalent Focal Length Calculator Enter a lens and a sensor size to get the crop factor, the full-frame equivalent focal length, the depth-of-fi
- Hex to RGB Converter Convert any hex color to RGB, RGBA and HSL in one step. Handles 3, 4, 6 and 8 digit codes, plus contrast again
- Image File Size Calculator Calculate an image's file size from its pixel dimensions, colour depth and compression, plus print size at 300
- Image Ratio Calculator Find any image's aspect ratio, the exact scale factor, and the pixels you get when you fit or fill a frame. Wo
- Mouse DPI Calculator Convert mouse DPI and in-game sensitivity into eDPI and cm per 360 turn. 800 DPI at 0.35 is 280 eDPI and 148.4
- PPI Calculator Enter a screen resolution and diagonal to get pixels per inch, dot pitch in millimeters, and the viewing dista
- Pixels to Print Size Calculator Convert pixels to inches at any DPI: see the print size a file covers, the DPI left after enlarging, and the p
- Portrait Aspect Ratio Calculator Convert any width or height into portrait aspect ratios: 4:5, 2:3, 3:4, 5:7 and 9:16 pixel sizes for Instagram
- RGB to Hex Converter Turn any RGB color into a hex code, with optional alpha, 3 digit shorthand and channel percentages. Rounding,
Developer
- Binary to Octal Converter Convert any binary number to octal instantly, with decimal and hex shown too. The converter groups bits in thr
- Password Generator Generate strong random passwords with your choice of length, letters, numbers and symbols. Uses your browser's
- QR Code Generator Create a QR code for any URL, text, phone number, email or Wi-Fi login. Choose the size, colors and error corr
Ecommerce
- Airbnb Host Fee Calculator See what Airbnb takes from a booking: 15.5% single fee or 3% split fee, the cleaning fee hit, your net payout
- Amazon FBA Fee Calculator Estimate Amazon FBA fees per unit on the 2026 rate card: fulfillment, referral and storage, with dimensional w
- Big Cartel Fee Calculator Add your Big Cartel plan fee to card processing and see the real monthly cut: 2.9% plus 30 cents on Stripe, ne
- Book Printing Cost Calculator Estimate book printing cost from page count, trim size, binding and paper stock, then compare print on demand
- CBM and Chargeable Weight Calculator Turn carton sizes into CBM, then compare actual and volumetric weight to see whether air or LCL ocean freight
- Carat Cost Calculator Estimate diamond cost from carat weight, price per carat, shape, setting, grading, and sales tax. See price pe
- Cash App Fee Calculator See exactly what Cash App takes: 2.6% plus $0.15 on business payments, 3% on Tap to Pay, and 0.5% to 2.5% on i
- Commission Calculator Work out commission on any sale with a flat rate or a tier, split it between reps, and see the clawback when a
- Cost of Goods Sold Calculator Enter opening stock, purchases, freight, labor and ending inventory to get cost of goods sold, gross profit, g
- Craft Cost Calculator Add up materials, labor, overhead, packaging, and marketplace fees to price handmade items. Get a retail price
- Custom Banner Cost Calculator Calculate custom banner printing costs across vinyl, mesh, and fabric. Estimate finishing, grommets, pole pock
- Depop Fee Calculator Free Depop fee calculator: US sellers pay 0% selling fee plus 3.3% + $0.45 processing. Add Boost and your cost
- Dimensional Shipping Weight Calculator Enter box dimensions and actual weight to see dimensional weight at the 139 divisor, the billable weight and w
- DoorDash Driver Pay Calculator Add up base pay, tips and Peak Pay, subtract gas at your mpg and price, and see real DoorDash earnings per hou
- Etsy Fee Calculator Free Etsy fee calculator: enter your price and see listing fee, 6.5% transaction fee, 3% + $0.25 payment proce
- Facebook Marketplace Fee Calculator Free Facebook Marketplace fee calculator: local sales are free, shipped checkout orders cost 5% with a $0.40 m
- Facebook Marketplace Price Calculator Work out what to list an item for on Facebook Marketplace. Enter your cost, target profit and the discount buy
- Fiverr Fee Calculator Fiverr keeps 20% of every order and your payout method takes $0 to $3 more. Enter a gig price to see your real
- Flip Profit Calculator Bought for $40 and sold for $95? Work out the real profit after platform fees, shipping, packaging and returns
- Garage Sale Price Calculator Price garage sale items by category and condition. Enter what each cost new to get a sticker price, your walk
- Gumroad Fee Calculator Free Gumroad fee calculator: see the 10% + $0.50 direct-sale fee, card processing on top, the 30% Discover rat
- Instacart Shopper Pay Calculator Add up batch pay, tips and mileage for an Instacart day, then subtract vehicle cost at the IRS rate to see wha
- Laser Engraving Price Calculator Price a laser engraving job from machine time, material, setup and target margin. See cost per piece, a defens
- Markdown Calculator Work out a retail markdown: $79.99 cut 25% sells for $59.99. Get the sale price, dollars off and total markdow
- Media Mail Cost Calculator Calculate official USPS Media Mail postage rates by weight up to 70 lbs. Compare book rates, check size limits
- Mercari Fee Calculator Free Mercari fee calculator: the 10% selling fee applies to the item price plus buyer-paid shipping. See your
- Pallet Cost Calculator Calculate landed pallet cost from unit price, freight, core deposits and repairs, then see cost per trip and t
- Patreon Fee Calculator: Net Creator Payout Patreon fee calculator for creators: 10%, 8%, 12% and 5% platform fees, 2.9% + $0.30 processing, micropayment
- PayPal Fee Calculator Free PayPal fee calculator for US sellers: see the 2.99% + $0.49 goods and services fee, Checkout, invoicing a
- Percentage Off Price Calculator Find the sale price and dollar savings from any percent off discount. See stacked coupon math, sales tax total
- Poshmark Fee Calculator Free Poshmark fee calculator: Poshmark takes a flat $2.95 under $15 and 20% at $15 or more. See your fee, net
- Printify Profit & Margin Calculator Calculate accurate print-on-demand profits and margins for Printify across Etsy, Shopify, and eBay including p
- Real Estate Commission Calculator See the total commission, each agent's share and the seller's net. A 5.5% commission on a $400,000 sale is $22
- Rental Commission Calculator Calculate residential and commercial rental commissions, broker splits, and total lease values with customizab
- Resale Price Calculator Price used items by condition and platform fee: see the list price, the fee, the shipping you absorb, and the
- Resale Value Calculator See what a used item fetches: enter what you paid, pick the condition, and get the asking price, the fee, the
- Restocking Fee Calculator Calculate a restocking fee and your real refund: fee percent, minimums, caps, sales tax, return shipping, plus
- Sale Price Calculator Work out a sale price from any discount, stack a second discount and add sales tax. See what you pay and what
- Sales Commission Calculator Calculate flat, tiered and base-plus-commission pay: a 10,000 sale at 8% returns 800, and 5% and 10% tiers pay
- Shopify Fee Calculator Free Shopify fee calculator: see your Shopify Payments card rate, any third-party transaction fee, the monthly
- StockX Fee Calculator Free StockX fee calculator: enter your sale price and Seller Level to see the 9% to 7% transaction fee, 3% pro
- Stripe Fee Calculator Free Stripe fee calculator: see the 2.9% + $0.30 domestic card fee, international, manually entered and curren
- Substack Fee Calculator See what Substack and Stripe take from each paid subscription, what you keep at $5, $8 or $50 a month, and why
- TikTok Shop Fee Calculator Free TikTok Shop fee calculator: pick your category to see the referral fee, per-order transaction fee, affili
- Upwork Fee Calculator Work out your net take-home on Upwork. Enter your contract amount to see the 10% service fee, withdrawal fees
- Used Item Price Calculator Price a used phone, table or tool from what it cost new: age-based depreciation, condition and extras, a comps
- Vinted Fee Calculator Free Vinted fee calculator: see the 5% + $0.70 Vinted fee the buyer pays, your full payout, your profit, and w
- Walmart Seller Fee Calculator Free Walmart Marketplace fee calculator: pick your category to see the referral fee, optional WFS fulfillment
- Whatnot Fee Calculator Free Whatnot fee calculator: see the 8% seller commission (4% for coins) plus 2.9% + $0.30 payment processing
- eBay Fee Calculator Free eBay fee calculator: see the final value fee for your category and store level, the per-order fee, and yo
- eBay Price Calculator Free eBay price calculator: enter your cost and price to see the 13.6% final value fee, the per-order fee, you
Everyday
- 1 Hour Cycling Calories Calculator One hour on the bike spans 343 to 1,440 calories for a 180 pound rider. See the 2024 Compendium METs, weight s
- 1 Hour Lunch Break Calculator Clock in at 8:30 and out at 5:00 with a 1 hour unpaid lunch: 7.5 paid hours and $150.00 a day at $20 an hour.
- 1 Million in Numbers 1 million in numbers is 1,000,000, a 1 with six zeros. See the comma grouping, scientific notation, and what a
- 1 Weeks Ago From Today See the exact date 1 week ago from today, the weekday it fell on, the 168 hours it holds, and how a clock chan
- 1 in 60 Rule Calculator Work the 1 in 60 rule: enter distance flown, distance to go, and how far off track you are to get track error,
- 10 Day Payoff Calculator Enter your balance, APR and payoff date to get per diem interest, the 10 day payoff total, and what each day o
- 10 Hour Shift Schedule Calculator Plan 10-hour shifts: weekly hours for 4 on 3 off, 5 on 2 off and 2-2-3 rotations, overtime past 40 hours, week
- 10 Minutes From Now 10 minutes from now is your clock plus ten minutes. See the carry rule, the 600 second form, the midnight case
- 10 Months Ago From Today See the exact date 10 months ago from today, the weekday it fell on, the 304 day span in hours and seconds, an
- 10 to 1 Arm Workout Calculator Build a 10 to 1 arm ladder and get the exact rep count, work time, rest time, total session length, and a calo
- 10207 2: Log Base 2 Calculator What 10207 2 means in log base 2 terms: log2(10207) = 13.3173 by change of base, with worked steps, a bits tab
- 1099 Hourly Rate Calculator Turn a 1099 contract into an hourly rate. Enter the contract total or a salary target, hours and weeks, and se
- 11 Months Ago From Today See the exact date 11 months ago from today, the weekday it fell on, the 335 day span in hours and seconds, an
- 11 Weeks Ago From Today See the exact date 11 weeks ago from today, the weekday it landed on, the 77 day span in hours and seconds, an
- 12 Hour Shift Pay Calculator Work out what a 12-hour shift pays: weekly hours, overtime past 40, hospital 8 and 80 rules, shift differentia
- 12 Months Ago From Today See the exact date 12 months ago from today, the weekday it fell on, the 365 day span in hours and seconds, an
- 12 Weeks Ago From Today See the exact date 12 weeks ago from today, the weekday it fell on, the 84 day phase in hours and seconds, and
- 120 Minutes Ago 120 minutes ago is two hours before the clock reading, with the minute digits unchanged. See the date roll at
- 13 Months Ago From Today Pin down the exact date 13 months ago from today, its weekday, the 396 day interval in hours and seconds, plus
- 13 Weeks Ago From Today See the exact date 13 weeks ago from today, the weekday it fell on, the 91 day stretch in hours and seconds, a
- 15 Minutes From Now 15 minutes from now is your clock plus a quarter hour. See the carry rule, the 900 second form, quarter hour b
- 15 Months Ago From Today Pin down the exact date 15 months ago from today, its weekday, the 457 day interval in hours and seconds, plus
- 15 Weeks Ago From Today See the exact date 15 weeks ago from today, the weekday it fell on, the full 105 day phase in hours and second
- 150 Minutes Ago 150 minutes ago is 2 hours 30 minutes before the clock, a 9,000 second gap. See the borrow rule, unpaid meal m
- 150 Minutes From Now 150 minutes from now is your clock plus 2 hours 30 minutes. See the carry rule, the 9,000 second form, midnigh
- 16 Months Ago From Today See the exact date 16 months ago from today, the weekday, the 488 day interval in hours and seconds, and how t
- 16 Weeks Ago From Today See the exact date 16 weeks ago from today, the weekday it fell on, the 112 day phase in hours and seconds, an
- 17 Months Ago From Today See the exact date 17 months ago from today, the weekday it fell on, the 518 day interval in hours and seconds
- 180 Minutes Ago 180 minutes ago is three hours before the reading, with the minute digits unchanged. See the date roll before
- Accuracy Calculator Calculate measurement accuracy, percent error, signed error, absolute difference, and percent difference from
- Actual Cash Value Calculator Calculate actual cash value from replacement cost, age and useful life, with straight-line and declining-balan
- Add Times Calculator Add multiple time durations across days, hours, minutes, and seconds. Calculate total elapsed duration, decima
- Additive Inverse Calculator Find the additive inverse of any integer, decimal, or fraction, check that the pair sums to zero, and compare
- Air Dry vs Dryer Cost Calculator Compare air drying clothes with running the dryer. Enter your dryer watts, run time and electricity rate to se
- Amp to Volt Calculator Turn amps into volts through watts or resistance. Enter current plus power or ohms and get the voltage, the im
- Arccos Calculator Find the angle behind a cosine value from -1 to 1 in degrees and radians, or use adjacent and hypotenuse sides
- Audiobook Speed Calculator Enter an audiobook's length and your playback speed to see the new runtime, minutes saved, and daily listening
- Baking Soda Deodorizer Calculator Baking soda deodorizer guide and calculator: how much to use for a fridge, carpet, trash can, shoes or drain,
- Big Number Calculator Add, subtract, multiply and divide numbers with dozens of digits and keep every digit, then read each result i
- Birthday Calculator Enter a birth date to get your exact age, the weekday you were born, your next birthday's weekday, the date of
- Bond Order Calculator Calculate bond order from bonding and antibonding electron counts, get fractional resonance values, and check
- Bow FPS Calculator Estimate real arrow speed from an IBO or ATA rating. Adjust for draw length, draw weight, arrow grains and str
- Bra Size Calculator Enter underbust and bust measurements to get your US band and cup, sister sizes, and the same size in UK, EU,
- Buoyancy Calculator Find the buoyant force in fresh water, sea water or any fluid, plus the float or sink call, the submerged frac
- CBM Calculator Turn carton dimensions into total CBM, cubic feet and liters, then see the share of a 20 or 40 foot container
- Cash Back Calculator Cash back calculator: add up rewards by spending category, subtract the annual fee, spread a sign-up bonus and
- Cash on Cash Return Calculator Work out cash on cash return from your down payment, closing costs and rehab budget, then compare the financed
- Ceiling Fan Size Calculator Ceiling fan size calculator: enter your room size and ceiling height to get the blade span, minimum CFM, downr
- Chebyshev's Theorem Calculator Enter a mean, a standard deviation and k to get the guaranteed share inside that band, the cap outside it, and
- Cofactor Determinant Calculator Expand a 2x2, 3x3 or 4x4 determinant by cofactors and see every minor, sign and term, with the totals for all
- Constant of Proportionality Calculator Enter one pair of x and y values to get the constant of proportionality k, the equation y = kx, and prediction
- Consumer Surplus Calculator Enter the top price buyers would pay, the market price and the quantity to get the consumer surplus, total spe
- Coulomb's Law Calculator Use the Coulomb's law calculator to get the force between two charges in newtons. Worked cases: 0.14 N at 8 cm
- Coulombs to Microcoulombs Convert coulombs to microcoulombs in one step: enter charge in C, mC, µC or nC and read every SI prefix, with
- Coulombs to Millicoulombs Convert coulombs to millicoulombs and back, with the mAh bridge: battery charge, coulomb counting, capacitor e
- Coulombs to Nanocoulombs Convert coulombs to nanocoulombs with the exact factor of 10^9, plus worked examples, a table of common charge
- Coulombs to Picocoulombs Convert coulombs to picocoulombs with the exact 10^12 factor, worked examples, a conversion table and the elec
- Crossed Cylinder Calculator Combine two cylinder lenses at any axes. The calculator returns the resultant cylinder, its axis and the induc
- Days Ago Calculator Find the date 1,000, 90 or 30 days ago with its weekday, or count days between two dates. Whole calendar days,
- Deadweight Loss Calculator Enter the price and quantity before and after a tax to get the deadweight loss triangle, the number of trades
- Degrees to Radians Convert degrees to radians in one step: type an angle and get radians, the multiple of pi, milliradians and gr
- Dice Roller Roll d4, d6, d8, d10, d12, d20 or d100 dice online. Set the count, add a modifier, and watch the session log t
- Dilution Calculator Solve C1V1 = C2V2 for stock volume, batch size or strength, turn a 1:N label into percent, and see exactly how
- Dish Soap per Gallon Calculator Calculate how much dish soap to add per gallon for plant spray, window washing, hand dishwashing, and floors w
- Dish Soap to Water Ratio Calculator Free dish soap to water ratio calculator: get the exact soap and water amounts for spray cleaners, mopping, de
- Dishwasher Detergent Calculator Work out how much dishwasher detergent each load needs from your water hardness, plus loads per container and
- Distance Calculator Get the straight-line distance between two coordinates in miles, kilometers and nautical miles, with the beari
- Dock Water Allowance Calculator Calculate Dock Water Allowance (DWA), FWA, and permissible dock draft for vessels loading in brackish or fresh
- Drip Rate Calculator Turn IV volume, drop factor and minutes into drops per minute and mL per hour, or work back from a drip rate t
- Dryer Cost Calculator See what a load of laundry costs to dry. Enter your dryer's watts, the cycle time and your electricity rate to
- ERA Calculator Enter earned runs and innings pitched to get ERA to two decimals, plus the 7-inning softball version, with the
- Efficiency Calculator Turn useful output and energy input into an efficiency percentage, then see what the wasted kilowatt-hours cos
- Employee Cost Calculator Enter an hourly wage, hours and benefit costs to get the full annual cost of one employee, with 2026 payroll t
- Endpoint Calculator Give the midpoint and one endpoint to get the other end in 2D or 3D, plus the segment length, slope, line equa
- Enthalpy Calculator Find the enthalpy change for heating, cooling, melting, boiling or condensing: enter a mass and a substance an
- Entropy Calculator Find the entropy change for heating, cooling, melting, boiling or gas expansion. Enter a mass or moles and get
- Equilibrium Constant Calculator Compute Kc from equilibrium concentrations, convert Kp with (RT)^delta n, solve the ICE quadratic for x and tu
- Expected Value Calculator Enter each outcome's chance and net value to get the expected value per try, the result over 10, 100 and 1,000
- Feed Per Tooth Calculator Turn spindle RPM, flute count and table feed into feed per tooth in inches and millimeters, plus surface speed
- Feed Rate Calculator Calculate milling feed rate in IPM and mm/min from RPM, chip load and flute count, plus a reverse SFM to RPM p
- Feet Per Second Calculator Convert feet per second to mph, km/h, m/s, and knots with exact NIST factors, plus pace per mile and distance
- Finance Calculator Free finance calculator: enter take-home pay and monthly bills to see money left over, your savings rate and h
- Flow Rate Calculator Convert any flow into GPM, L/min, L/s, m3/h and CFM from a volume and a fill time, or get flow from pipe diame
- Formal Charge Calculator Find the formal charge on any atom from its valence electrons, lone pairs and bonds, with worked checks for wa
- Furnace Cost Calculator Estimate what a furnace costs to buy, install and run. Compare natural gas, propane, oil and electric heat at
- GI Bill Monthly Housing Allowance Calculator Estimate Post-9/11 GI Bill MHA from your campus ZIP BAH rate, benefit tier and rate of pursuit, with the 2026
- Garden Yield Calculator Estimate how many pounds of vegetables your garden will produce. Enter the crop and number of plants to see ex
- Gold Cost per Pound Calculator Work out gold cost per pound from any spot price, with troy ounce conversion, karat purity and dealer premium,
- Graduation Gift Calculator Wondering how much cash to put in a graduation card? Get an amount by relationship, degree and cost of living,
- Grass Cutting Estimate Calculator Estimate lawn mowing and grass cutting costs. Price a yard in square feet or acres by grass height, cutting fr
- Grocery Delivery Tip Calculator Set a fair tip for grocery delivery: 15 to 20 percent of the order, extra for heavy loads, with totals, splits
- Grocery Split Calculator Split a grocery receipt between two people: shared items down the middle, personal items to each person, and t
- HCF Cost Calculator Convert HCF to gallons and dollars. See how 12 HCF prices out at $359 with tiered rates, sewer charges and fix
- Hair Stylist Tip Calculator Work out a hair stylist tip in seconds: 15% to 20% on a $65 cut is $9.75 to $13.00, plus $3 to $5 for a shampo
- Heron's Formula Calculator Find a triangle's area from three sides with Area = sqrt(s(s-a)(s-b)(s-c)), s = (a+b+c)/2. Checks the triangle
- House Price Change Calculator Work out how much a home gained or lost since you bought it, the annualized return, and how your result compar
- How Much Fabric Softener Per Load Use 60 ml (4 tbsp) of conventional softener for a medium load, 30 ml for small, 90 ml for large. See yearly bo
- How Much Floor Cleaner Per Gallon Turn any floor cleaner label ratio into ounces, cups and tablespoons per gallon, plus the quart and gallon con
- How Much to Give for a Wedding Most guests give $150, siblings and best friends give $250 or more, and coworkers land near $100. See the rang
- How to Remove Stains: The Guide By Stain Type Stain removal by type: cold water for protein stains like blood, the 30 minute soak, dish soap for grease, and
- Hydroseeding Cost Calculator Price hydroseeding by the square foot with seed, mulch and prep adders, then see the cost per 1,000 square fee
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Finance
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- Florida Overtime Calculator Calculate Florida overtime pay under state and FLSA wage laws. Compute weekly time-and-a-half earnings, bonus
- Florida Sales Tax Calculator Florida sales tax calculator by county: enter a price and your county to see the 6 percent state tax, the coun
- Freight Class Calculator Turn pallet dimensions and weight into pounds per cubic foot, then read the 2025 NMFC density scale to get fre
- Future Salary Calculator Calculate your future salary based on annual raises, inflation, and years of growth. Project nominal pay, real
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- GDP Calculator GDP calculator: convert nominal GDP to real GDP with the price deflator, find the growth rate and output per p
- GDP Price Index Calculator Compute the GDP price index, implicit price deflator, real GDP, and annualized inflation rate across economic
- GDP per Capita Calculator Divide GDP by population to get output per person, then convert to purchasing power dollars, per household, mo
- Gender Wage Gap Calculator The 2023 gender wage gap: women earned 83.6 cents on the dollar, a 16.4 percent gap on $1,202 median weekly pa
- Gift Tax Calculator See how much of a 2026 gift the $19,000 annual exclusion covers, what has to go on Form 709, and whether any g
- Gold to Silver Price Ratio Calculator Enter the gold price and the silver price to get the gold to silver ratio, its inverse and the swap math. See
- Grocery Budget for a Family of 4 See what a family of 4 should spend on groceries in 2026: USDA food plan costs run 1,024.90 to 1,682.90 a mont
- Gross Rent Multiplier Calculator Get the gross rent multiplier, months of rent and gross yield from price and rent, then add vacancy and operat
- Growth Rate Calculator Enter a starting value, an ending value and the number of periods to get total growth percent, the average cha
- HELOC Monthly Payment Calculator Calculate your HELOC monthly payment during the draw and repayment periods. See payment shock jumps, interest
- Home Equity Loan Monthly Payment Calculator Work out the monthly payment on a fixed rate home equity loan, with total interest, the first payment split an
- Hourly Pay Calculator Enter a gross paycheck, hours, overtime and tips to back out your real hourly rate, the overtime premium, a ti
- Hourly to Salary Calculator Turn an hourly wage into a yearly salary with overtime and unpaid weeks. See monthly, biweekly and weekly pay,
- House Loan Monthly Payment Calculator A $400,000 house with 10 percent down costs $3,030.44 a month. Enter price, rate, tax and insurance to see pri
- How Long to Save Calculator Enter a savings goal, what you have now, and your monthly deposit to see how many months and years it takes to
- How Much Car Insurance Do I Need? Size your car insurance liability limits, deductible and physical damage coverage to your savings and see what
- How Much Does a Wedding Cost? See what a US wedding costs in 2026: $34,200 on average, $292 per guest, with venue and catering at 53 percent
- How Much House Can I Afford See how much house you can afford. Enter your income, debts, down payment and rate to get a home price from th
- How Much Rent Can I Afford? Enter your income and debts to see how much rent you can afford: the 30% rule, the 40% debt ceiling and what i
- How Much Should I Have in Savings By Age? Savings benchmarks by age: retirement salary multiples from 1x at 30 to 8x at 60, plus the 3 to 6 month emerge
- How Much Should I Spend on Groceries Per Month? USDA's July 2026 food plans put a family of four at $1,024.90 to $1,682.90 a month. Build your own number by h
- How Much to Save for College Per Month Work backward from a college target: a 100000 dollar goal costs 251 dollars a month from birth, 786 a month if
- How Much to Spend on an Engagement Ring The two months salary rule was an ad campaign, not a budget. Build a ring budget from your own take-home pay a
- How Much to Tip Free tip calculator: enter your bill and tip percentage to see the tip, the total and the per-person split, pl
- IRR Calculator Enter an investment and its yearly cash flows to get the internal rate of return. This free IRR calculator ann
- Income Based Rent Split Calculator Split rent by what each roommate earns: enter incomes and the rent to see each person's proportional share ver
- Income Elasticity of Demand Calculator Calculate income elasticity of demand from two incomes and two quantities, with the midpoint method, a normal
- Increase Price by Percentage Calculator Raise any price by a percentage and see the new price, dollar increase and gross margin. Includes a break-even
- Indirect Costs Calculator Turn an indirect cost pool and an allocation base into an overhead rate, then apply it to a job. Includes two
- Inflation Calculator Free US inflation calculator: enter an amount and two years to see what that money is worth today, using offic
- Interest Calculator Find simple and compound interest on any balance, or work backward to the rate a savings target needs. See the
- Interest Rate Calculator Solve the interest rate behind a monthly payment, then add points and fees to see the true yearly cost of each
- Internet Bill Split Calculator Split an internet bill between roommates in seconds: see the equal share, a prorated share for time away, and
- Investment Calculator Free investment calculator: add a starting amount, monthly contribution, return and years to see your future b
- Itemized Bill Split Calculator Split a restaurant bill fairly: each person pays their own items plus a fair share of tax and tip, worked out
- Laundry Cost Per Load Calculator See what one load of laundry costs. Enter your energy and water rates, detergent and machine type to get the c
- Line of Credit Monthly Payment Calculator Calculate line of credit monthly payments. Interest-only draw, fixed percentage, and amortizing repayment form
- Liquor Cost Percentage Calculator Calculate bar pour cost percentage, drink recipe portion costs, bottle yields, and beverage margins using Corn
- Loan Calculator Compare two personal loan offers side by side: monthly payment, total interest, the real APR after an originat
- Machinery Cost Calculator Estimate what a tractor, combine or excavator costs to own and run. Enter price, life, hours and fuel use to g
- Maintenance Fee Calculator Calculate condo and co-op maintenance fees. Operating vs. reserve split, square footage or equal allocation, f
- Margin Calculator Turn cost and price into gross margin, markup and net profit. See why a $100 cost sold at $150 is a 33% margin
- Markup Calculator Free markup calculator: enter your cost and markup to see the selling price, profit per unit and gross margin,
- Mileage Deduction Calculator Work out your 2026 mileage deduction at the IRS rate for business, medical, moving or charity miles, and see w
- Minimum Payment Calculator See how long a card takes to clear if you pay only the minimum, the interest you hand over, and what an extra
- Mobile Home Monthly Payment Calculator Estimate a mobile home payment with loan principal, interest, lot rent, taxes and insurance. A $95,000 home at
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- Monthly Loan Payments Calculator Calculate monthly loan payments, total interest, and payoff schedules for personal, auto, and home improvement
- Monthly Payment Formula Calculator Calculate loan payments using the standard amortization formula. Learn the derivation, periodic interest rate
- Monthly Salary to Hourly Pay Calculator Turn a monthly salary into an hourly wage. See how 2,080 paid hours, unpaid weeks and overtime at 1.5 times th
- Monthly to Annual Cost Calculator Convert monthly expenses to annual, weekly, and daily costs. Calculate cumulative multi-year spending and comp
- Mortgage Calculator Free mortgage calculator: enter the price, down payment, rate and term to get your monthly payment, total inte
- Motorcycle Monthly Payment Calculator Estimate monthly motorcycle loan payments with APR, terms from 12 to 72 months, down payment, trade-in, and ta
- Mover Tip Calculator Enter the bill, crew size and hours to see a fair mover tip three ways: percent, per mover per hour and flat p
- Nanny Cost Calculator Estimate nanny cost from the hourly rate, weekly hours, overtime and employer payroll taxes, with 2026 thresho
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- New York Sales Tax Calculator Add New York sales tax to any price: pick your county or city, from the 4% state rate to 8.875% in New York Ci
- Occupancy Cost Calculator Annual occupancy cost from base rent, operating expenses, utilities, parking, and services, plus cost per squa
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- Overtime Calculator Enter your hourly rate and hours worked to see your time-and-a-half overtime pay, double-time hours and the re
- PVIFA Calculator Find the present value interest factor of an annuity for any rate and term, with a full table, worked examples
- Part Time Hourly to Salary Calculator Enter a part time hourly rate, weekly hours and paid weeks to see weekly, monthly and yearly pay, plus what th
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- Pay Off a $5,000 Credit Card See how long a $5,000 credit card balance takes to clear at your APR and payment, what minimum payments cost,
- Pay Raise Calculator Free pay raise calculator: see your new salary and what the raise adds per year, month, paycheck and hour, whe
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- Pennies to Dollars Calculator Enter a pile of pennies and get the dollar amount, plus coin rolls, coin weight and stack height, with a rever
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- Percent Increase Calculator Free percent increase calculator: enter an original value and a new value to get the percentage increase or de
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- Reverse Sales Tax Calculator Enter the total you paid and the sales tax rate to back out the price before tax and the tax itself, with work
- Salary Calculator Compare two salary offers on total pay: base, bonus, 401(k) match, health coverage and PTO, then see the real
- Salary Increase Calculator Turn a raise into a new salary, a yearly increase and the change per paycheck. Enter a percent or a dollar amo
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- Sales Tax Calculator Add sales tax to any price or reverse a tax inclusive total back to its pre tax amount, with combined rates, s
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- Save $1,000 in 30 Days Calculator See the daily and weekly amount that gets you to $1,000 in 30 days, compare flat, ramp up and front loaded sch
- Savings Goal Calculator Enter a goal, what you have saved and a monthly deposit to see how many months it takes, what interest adds, a
- Savings Interest Rate Calculator See what a 4.00% savings rate pays: APY of 4.07%, inflation-adjusted gain on $10,000, and the FDIC national ra
- Second Story Addition Cost Calculator Estimate a second story addition in 2026: shell, structural reinforcement, stairs, bath, HVAC, design fees and
- Self-Employment Tax Calculator Estimate self-employment tax on your 1099 or business profit: 15.3% for Social Security and Medicare, plus the
- Seller Cost Calculator Work out what you keep when selling a home: agent commission, seller closing costs, concessions, repairs, and
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- Social Security Monthly Payment Calculator Estimate your monthly Social Security check for any claiming age 62 to 70. Enter your PIA, apply official redu
- Speaker Fee Calculator Estimate what a keynote speaker costs an event and what the speaker keeps after travel, hotel, per diem and 20
- Spin-Off Cost Basis Calculator Allocate stock cost basis after a corporate spin-off using IRS relative fair market value rules. Compute paren
- Stacked Discount Calculator Two discounts of 20% and 25% give 40% off, not 45%. Stack percent-off codes, coupons and sales tax in the righ
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- Startup Cost Calculator Add up the real cost of opening a shop: LLC filing, licenses, equipment, first inventory, months of runway and
- Stock Average Cost Calculator Stock average cost calculator: add each lot and commission to see your average cost per share, break-even pric
- Streaming Cost Calculator Add up what your streaming plans cost. See the monthly and yearly total, the ad-free premium, and what an annu
- Student Loan Calculator Free student loan calculator: enter your balance, rate and term to see the monthly payment, the total interest
- Subscription Cost Calculator Add up to five subscriptions on any billing cycle to see the monthly and yearly total, plus what a 5% price in
- Subscription Cost per Year Find the true yearly cost of any subscription. Enter the price and billing cycle to see annual, monthly, weekl
- TSP Monthly Payment Calculator Work out your TSP loan payment from balance, term, and the G Fund rate. See monthly and biweekly deductions, t
- Take-Home Pay Calculator Turn a gross salary into real take-home pay using the 2026 federal brackets, FICA and your state rate, with mo
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- Tax Refund Estimator See whether you get a refund or owe money: enter income, federal tax withheld and children to compare your 202
- Texas Sales Tax Calculator Enter a price and pick the local rate to see the 6.25 percent Texas state tax, the local add on up to 8.25 per
- Time Card Calculator Free time card calculator: enter your daily hours and hourly rate to get total hours, overtime at time and a h
- Time and a Half Calculator Free time and a half calculator: enter your hourly rate and overtime hours to see your 1.5x overtime pay and t
- Tip Calculator With Tax See the tip on the pre-tax and post-tax amount side by side, the dollar gap between them, and what each person
- Tip Jar Split Calculator Split a pooled tip jar by hours worked or by weighted role. Enter the pool, card fee and each person's hours t
- Toyota Monthly Payment Calculator Work out the monthly payment on a new Toyota after trade-in, down payment, sales tax, doc fees and APR, and se
- Trip Gas Price Calculator Work out fuel cost for any road trip from miles, MPG and the pump price, with fill-up counts, cost per person
- Turnover Cost Calculator See what one resignation costs in recruiting, HR time, lost output, training and ramp-up, then turn it into a
- US Pay Gap Calculator Compare any salary against the 2024 BLS median pay for full-time men and women, and see the gap by race, age a
- Upfront Cost Calculator Add up cash due on day one: down payment, tax, fees, prepaid insurance, setup and a reserve. Compare a low dow
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- VA Monthly Payment Calculator Estimate a VA loan payment with the 2026 funding fee, taxes, insurance and HOA. See why there is no monthly mo
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- Variable Cost Ratio Calculator Divide variable costs by net sales to get your variable cost ratio, contribution margin, break-even sales and
- Vehicle Monthly Payment Calculator Work out a vehicle loan payment from price, trade-in, down payment, sales tax and fees. See the payment, total
- WACC Calculator Build WACC from market values, a CAPM cost of equity and the after-tax cost of debt, with the 21 percent feder
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- Wedding Gift Calculator Estimate a wedding gift amount by relationship, head count, travel cost, and budget, with presets, event split
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- Weekly Pay to Annual Salary Calculator Convert your weekly pay to annual salary across 52-week, 50-week, monthly, and hourly rates. Includes 2026 IRS
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- Yield on Cost Calculator Find your dividend yield on cost from purchase price, current dividend and growth. See the 10 year projection
- Yield to Maturity Calculator Enter a bond's price, coupon and years to get the exact YTM by bisection, plus current yield, coupon income, c
- Zillow Monthly Payment Calculator Rebuild a Zillow-style house payment: principal, interest, tax, insurance, HOA and PMI. See the full breakdown
- kWh to Cost Calculator Convert kilowatt-hours (kWh) to electricity cost using current utility rates. Estimate monthly bills and appli
Gaming
- Custom Dice Roller Roll any dice notation like 2d6+3 and see the odds: full range, average, standard deviation and the chance of
- D100 Dice Roller Roll 1 to 20 d100 dice with a modifier and target. Every face is exactly 1%, and the odds line shows your chan
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- Minecraft Circle Generator See the block count, row profile and outline for any Minecraft circle diameter. A 15 block circle needs 40 out
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- Poker Odds Calculator Turn your outs into equity with the rule of 2 and 4, compare it with the pot odds you are offered, and see the
- Twitch Bits to USD Convert Twitch Bits to real dollars. See exactly what a streamer receives per Bit ($0.01), what viewers pay fo
- eDPI Calculator Convert DPI and in-game sensitivity into eDPI, cm per 360 turn and a matching sensitivity at a new DPI. 800 DP
Health
- 10-Year ASCVD Calculator Calculate your 10-year ASCVD risk using the ACC/AHA pooled cohort equations. See your risk band, statin guidan
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- 10-Year CVD Risk Calculator Estimate 10-year cardiovascular risk from total cholesterol, HDL, blood pressure and smoking, and see where yo
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- 10-Year Cardiovascular Risk Calculator Enter age, sex, race, cholesterol and blood pressure to get your 10-year heart attack and stroke risk, plus ho
- 10-Year Fracture Risk Calculator Answer the FRAX style questions for a low, moderate or high 10-year fracture band, plus a note on when a bone
- 10-Year Heart Risk Calculator A blood pressure and lifestyle self check for 10-year heart risk, scored from age, BP, smoking, diabetes, BMI
- 10-Year Risk Calculator Score nine factors with the ACC/AHA pooled cohort equations, read your 10-year ASCVD band, and see what quitti
- 10-Year Stroke Risk Calculator Score your 10-year stroke risk with the Framingham point tables: age, blood pressure, diabetes, smoking, atria
- 10-Years ASCVD Risk Calculator Run the 2013 pooled cohort equations step by step: age, cholesterol, HDL, blood pressure, smoking, diabetes, t
- 6-Minute Walk Test Calculator Enter your six-minute walk distance in meters to see the percent predicted for your age, sex, height and weigh
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- BAC Calculator Estimate blood alcohol content from your weight, sex, drinks and hours using the Widmark formula, and see how
- BMI Calculator Enter height and weight in pounds or kilos to get your BMI, your CDC category, the healthy weight range for th
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- BMI Calculator for Women BMI calculator for women with CDC categories, healthy weight ranges by height, waist circumference risk check,
- BMI Calculator kg Metric BMI calculator in kilograms and meters using the WHO formula. Get your index, category, and healthy wei
- BMI Chart for Adults Find your BMI on a height and weight chart, see the CDC adult categories, the healthy weight range for your he
- BMI Prime Calculator Free BMI Prime calculator: enter your height and weight to get your BMI, your BMI prime and your category, plu
- BMI Weight Loss Calculator Find your current BMI, the weight in the healthy range for your height, and how many pounds to lose at a stead
- BMI in Pregnancy Calculator Find your pre-pregnancy BMI and the weight gain range that goes with it, plus where you sit at your current we
- BMR Calculator Estimate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict and Katch-McArdle, see how far the three d
- BMR Katch-McArdle Calculator Estimate BMR from lean body mass with the Katch-McArdle formula, see how a body fat error shifts the result, a
- BSA Calculator Free body surface area calculator: enter height and weight to get BSA in square metres using the Mosteller, Du
- BUN to Creatinine Ratio Calculator Divide BUN by creatinine to get the ratio, see whether it sits in the usual 10:1 to 20:1 band, and read what a
- Baby Vaccine Schedule See which shots a baby gets at 2, 4, 6, 12, 15 and 18 months, how combination shots cut the needle count, and
- Bench Press Calculator Estimate your bench press one rep max from reps at a lighter weight, see where you rank by bodyweight and age,
- Blood Pressure Category Calculator Enter a systolic and diastolic reading to see which of the five AHA categories it falls in, which number decid
- Blood Sugar to A1C Calculator Convert an average blood sugar to an estimated A1C, or turn an A1C into average glucose in mg/dL or mmol/L. Fr
- Blood Type Calculator Enter both parents' blood types and Rh factors to see every blood type their child could have, the chance of e
- Blood Type Compatibility Chart Check blood type compatibility for red cells and plasma: pick a recipient and donor to see if they match, plus
- Body Fat Calculator Estimate body fat with a tape measure using the U.S. Navy formula for men and women, then see fat mass, lean m
- Body Fat Calculator for Women Estimate your body fat percentage with a tape measure using the U.S. Navy formula for women, plus fat mass, le
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- Body Surface Area Calculator Work out body surface area from height and weight with four published formulas, then turn a mg per m2 order in
- Body Water Calculator Estimate total body water in liters from weight, height, age and sex with the Watson equation, plus a body fat
- Botox Cost Calculator Estimate Botox costs by treatment area, units needed, and provider rate. Calculate single session and annual m
- Breastfeeding Calorie Calculator Breastfeeding burns extra calories every day. Enter your baby's age and how much you nurse to see the calories
- Calorie Calculator Find the calories you need each day to lose, hold or gain weight. Mifflin-St Jeor math, protein and carb grams
- Calorie Deficit Calculator Work out your calorie deficit: enter your stats to get TDEE, a safe daily deficit, and the date you would hit
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- Calories Burned Calculator Estimate calories burned for 15 activities by weight and minutes, with MET values, gross and net calories, and
- Calories Burned Running Calculator Find the calories burned running by weight, distance and pace. 3 miles at a 10 minute pace burns 341 calories
- Calories to Joules Converter Convert calories to joules with the exact 4.184 J factor, see kcal to kJ for food labels, and check portions f
- Carbohydrate Calculator Enter your daily calories and carb percentage to get carbohydrate grams. See how 4 calories per gram turns any
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- Child BMI Percentile Calculator Work out your child's BMI percentile for age and sex using CDC growth data, with the healthy weight range for
- Cholesterol Ratio Calculator Enter a lipid panel and get the total to HDL ratio, LDL to HDL, triglycerides to HDL, non-HDL and HDL share, w
- Conception Date Calculator Work out when conception likely happened from a due date or a last period. A January 5, 2026 period with a 28
- Cost of Smoking Calculator Add up what smoking costs a pack a day, a decade and a working lifetime, including the money you would have if
- Desk Height Calculator Enter your height to get the desk height for sitting and standing, plus chair, keyboard and monitor heights in
- Due Date Calculator Enter the first day of your last period and your cycle length to get an estimated due date, your gestational a
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- Harris-Benedict Calculator Calculate BMR with the 1918 Harris-Benedict equation and the 1984 revision, in pounds or kilograms, plus the a
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- Heart Rate Zone Calculator Calculate your 5 aerobic training heart rate zones using the Tanaka, Gellish, or Karvonen formulas with restin
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- How Far Along Am I? Free pregnancy calculator: enter your last period or due date to see how many weeks and days pregnant you are
- How Long Does It Take to Lose 10 Pounds? A 500 calorie daily deficit takes 35,000 / 500 = 70 days, about 10 weeks, to lose 10 pounds. See the math, the
- How Many Calories in a Beer? A 12 oz regular beer has about 153 calories, and most come from alcohol. Enter size, ABV and carbs to see calo
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- Incidence Rate Calculator Convert new cases into an incidence rate per 1,000 or 100,000 person-years, or per 100,000 population per year
- Joules to Calories Converter Convert joules to calories by dividing by 4.184 and food Calories by 4,184, with kJ to kcal label steps, gym e
- Lean Body Mass Calculator Get lean body mass from height and weight with the Boer equation, plus James and Hume, fat mass, implied body
- Macro Calculator Get daily protein, fat and carb grams from your weight, height, age and goal. Uses 4 calories per gram for pro
- Maintenance Calorie Calculator Find the daily calories that hold your weight steady: Mifflin-St Jeor BMR, activity factors, and a 2 to 4 week
- Max Heart Rate Calculator Compare 220 minus age with the Tanaka, Nes and Gulati formulas for maximum heart rate, with the 10 beat error
- Navy Body Fat Calculator Estimate body fat with the Navy circumference method, run the 2026 waist-to-height screen, and see how far you
- One Rep Max Calculator Estimate your one rep max from a 3 to 10 rep set with the Epley, Brzycki, Lander and O'Conner formulas, then t
- Ovulation Calculator Enter your last period and cycle length to get your ovulation date, your six-day fertile window and your next
- Period Calculator Enter the first day of your last period and your cycle length to get your next period dates, when it ends, and
- Pregnancy Calculator Enter a last period, conception date, IVF transfer or scan to get your due date, your weeks today and every da
- Pregnancy Week Calculator Work out your pregnancy week and day from the first day of your last period, or work backward from a due date,
- Pregnancy Weight Gain Calculator Enter your pre-pregnancy weight, height and week to see the recommended gain range for your BMI, your target a
- Protein Calculator Enter your weight in pounds to get a daily protein target in grams, grams per pound, a per meal split, and how
- Protein Intake Calculator Find your daily protein target in grams from body weight and training level, with a calorie check and grams pe
- Push-Ups Calorie Calculator See calories burned doing push-ups: enter weight and minutes to get the burn at moderate and vigorous effort,
- Quit Smoking Savings Calculator See what cigarettes cost you a week, a year and over ten years, then check the CDC health timeline that starts
- RMR Calculator Estimate resting metabolic rate three ways: Mifflin-St Jeor, Harris-Benedict revised and the Cunningham equati
- Rucking Calorie Calculator Estimate calories burned rucking from body weight, pack weight, speed, grade and surface, with calories per mi
- Running Pace Calculator Convert running pace between min per mile and min per km, see your finish time for any distance, and read the
- Shot Cost Calculator Estimate what vaccines cost with and without insurance: flu, shingles, HPV, Tdap and COVID at 2026 pharmacy pr
- Sleep Calculator Set bedtime, alarm and minutes to fall asleep, then see the hours you get against the CDC range for your age,
- Sleep Cycle Calculator Free sleep cycle calculator: enter your wake-up time or bedtime for the best times to sleep, based on 90-minut
- Sleep Debt Calculator Add up the sleep you have missed over the last week or month, see it as a share of what you needed, and get th
- Steps to Calories Calculator Convert steps to calories by body weight and walking pace. See calories per step, minutes walked, miles covere
- Sunscreen Calculator Work out sunscreen by the ounce: 1 ounce per adult per application, reapplied every 2 hours, so a family of fo
- TDEE Calculator Work out your total daily energy expenditure from BMR and an activity multiplier, then see the calorie target
- Target Heart Rate Calculator Find your Karvonen target heart rate zone, compare it with a plain percentage of maximum, and see all five tra
- VO2 Max Calculator Estimate VO2 max from a Cooper 12-minute run, a 1.5-mile time, a Rockport walk or your resting heart rate, wit
- Waist to Height Ratio Calculator Divide your waist by your height to get your ratio, the risk band, and the waist size that puts you at 0.5. Wo
- Waist-to-Hip Ratio Calculator Free waist-to-hip ratio calculator: enter your waist and hip measurements in inches or cm to get your WHR and
- Walking Calorie Calculator See how many calories a walk burns from your weight, pace and minutes. A 180 pound adult burns 141 calories in
- Water Intake Calculator Get a daily water target from your weight, exercise minutes and climate, split into food and drinks, with cups
- Weight Loss Calculator Turn a goal weight into a plan: pounds to lose, BMI now and at goal, the daily calorie target for your pace, t
- Zone 2 Heart Rate Calculator Zone 2 heart rate calculator: get your aerobic base zone in bpm on the percent of maximum scale and the heart
Home Improvement
- ADU Cost Calculator Calculate accessory dwelling unit construction costs for detached suites, garage conversions, and additions wi
- Acreage Calculator Turn length and width in feet, yards or meters into acres, square feet and hectares. Lot examples, odd shapes
- Aggregate Cost Calculator Estimate the cost of gravel, crushed stone, or sand by converting project dimensions into cubic yards, tons, a
- Air Conditioner Room Size & BTU Calculator Calculate the exact air conditioner BTU rating needed for your room size based on square footage, ceiling heig
- Aluminum Fence Cost Calculator Calculate aluminum fence installation costs by linear feet, height, and grade. Compare materials, contractor l
- Asphalt Calculator Turn length, width and compacted thickness into tons of hot mix asphalt, cubic yards, coverage per ton and the
- Awning Cost Calculator Estimate installed awning cost for retractable, stationary, and window styles. Price fabric, aluminum, motoriz
- Bathtub vs Shower Footprint Calculator Compare a bathtub and a shower by floor space. Enter both footprints to see the square feet each one uses and
- Bleach Dilution Calculator Mix the right bleach solution for any job: ounces, tablespoons and cups per gallon for 200, 1,000 and 5,000 pp
- Block Mortar Calculator Find out how many 80 lb bags of mortar a block wall needs. 100 standard 8x8x16 blocks take about 8 bags at a 3
- Board Footage Calculator Turn thickness, width, length and piece count into board feet, add a waste allowance and see the cost. Uses dr
- Board and Batten Layout Calculator Enter wall width, batten width and a target gap to get the batten count, the exact gap between boards, and how
- Board and Batten Siding Calculator Board and batten siding calculator: get board and batten counts, linear feet, house wrap rolls, and nail estim
- Board on Board Fence Calculator Work out boards, posts and rails for a board-on-board fence. Enter the run length, board size and overlap to g
- Borax Ant Killer Calculator Mix borax ant bait at a safe, low concentration. Enter the batch size you want and get exact borax, sugar and
- Brick Calculator Work out how many bricks a wall needs from its length, height, brick size, mortar joint and waste. See bricks
- Cabinet Door Calculator Size cabinet doors for any opening: enter width, height, overlay and door count to get the exact door size in
- Carpet Calculator Free carpet calculator: enter your room sizes to get square feet, square yards and roll length, with a waste a
- Carpet Removal Cost Calculator Estimate carpet and padding removal costs by square foot, attachment type, stairs and disposal. Get low, avera
- Carpet Shampoo Dilution Calculator Carpet shampoo dilution calculator: enter your machine tank size and cleaning area to get the exact ounces of
- Carport Cost Calculator Estimate carport cost by size, material, foundation, roof style, labor, and permit. See low, average, and high
- Ceiling Paint Calculator Ceiling paint calculator: enter your room's length and width to see the square footage and how many gallons of
- Cement Pad Cost Calculator Price a concrete pad for an AC unit, generator, hot tub or shed: volume in cubic yards, concrete, gravel base,
- Clapboard and Lap Siding Calculator Count clapboard or lap siding boards for any wall: enter size, openings, exposure and waste to get boards, cou
- Cleaning Solution Dilution Calculator Pick the job, the bottle size and your concentrate price to get the ounces of cleaner and water for a 1:10, 1:
- Compost Calculator Work out your compost carbon to nitrogen ratio. Add your greens and browns and see what to add to hit 30 to 1
- Concrete Block Calculator Enter wall size, openings and block type to get the concrete blocks you need, plus a 5% to 10% waste allowance
- Concrete Block Fill Calculator Estimate grout volume and 80 or 60 lb bags for concrete block core fill. Full or partial grouting, waste allow
- Concrete Calculator Enter length, width and thickness to get cubic feet, cubic yards and the count of 80, 60 or 40 lb bags to buy,
- Concrete Driveway Cost Calculator Estimate a poured concrete driveway: $6 to $18 a square foot by finish, plus tear-out, base and drainage lines
- Concrete Reinforcing Mesh Calculator Work out how many sheets or rolls of concrete reinforcing mesh a slab needs, with a 10% lap allowance and the
- Countersink Depth Calculator Find the exact countersink depth for any flat head screw. Enter head and pilot diameter, pick 82 or 90 degrees
- Cubic Yard Calculator Convert length, width and thickness into cubic yards in one step, then see how many 80 pound bags or 2 cubic f
- Curtain Cost Calculator Work out fabric yardage and the full cost of custom curtains: face fabric, lining, sewing labor, rods, and ins
- DIY Shed Cost Calculator Estimate DIY shed cost by size: 120 square feet at $55 per square foot is $6,600 in materials, plus foundation
- DIY Weed Killer Calculator Mix vinegar, salt and dish soap for the exact area you need to spray, see the finished acid strength, and chec
- Dawn Powerwash Recipe Calculator DIY Dawn Powerwash refill recipe: enter your bottle size and get the exact tablespoons of Dawn, rubbing alcoho
- Deck Board Spacing Calculator Calculate deck board spacing, uniform gap size, and board count. Plan for wood shrinkage, composite expansion,
- Deck Refinishing Cost Calculator Compare sanding and re-staining, new wood boards and a composite swap. Get the cost per square foot, a 15 year
- Deck Stain Calculator Free deck stain calculator: enter your deck size, coats and stain type to get the gallons of stain you need, p
- Dehumidifier Size Calculator Size a dehumidifier by square feet, dampness and temperature. See the pints per day you need, the gallons it p
- Demolition Estimate Calculator Estimate demolition cost per square foot for light, standard and heavy structures, plus debris hauling, permit
- Dishwasher Cost Calculator See what each dishwasher load costs. Enter your energy use, water use and electricity rate to get the cost per
- Door Header Size Calculator Size a door header from the rough opening: add 2 inches for shims and 3 for jack studs, then match the span to
- Doorway Clearance Calculator Check a doorway against ADA clear-width rules. Enter the door size, threshold and approach to see the clear op
- Drywall Calculator Work out drywall sheets, joint compound, tape and screws for any room. A 12 by 14 room with an 8 foot ceiling
- Energy Cost Calculator Compare electricity, natural gas, propane and heating oil in dollars per MMBtu, total your yearly energy bill,
- Epoxy Flooring Cost Calculator Calculate garage and basement epoxy flooring costs per square foot, including concrete prep, coatings, labor r
- Excavation Cost Calculator Estimate excavation cost by cubic yard: dig volume, soil hauling off site, imported backfill and permits, with
- Exterior Paint Calculator Free exterior paint calculator: enter your house perimeter and wall height to get the gallons for the siding,
- Fence Calculator Enter the run length, height and picket layout to get the posts, pickets, rails and concrete bags you need, pl
- Fence Post Depth Calculator Fence post depth calculator and guide: the one third rule, the 6 inch frost line margin, and the concrete bags
- Fence Stain Calculator Free fence stain calculator: enter your fence length, height, coats and stain coverage to see exactly how many
- Firewood Calculator Work out how many cords of firewood you need to heat your home all winter. Enter your square footage, climate
- First Frost Date by ZIP Enter your ZIP or USDA hardiness zone to estimate your first fall frost date, with the 50 and 10 percent odds
- Floor Joist Calculator Check floor joist spans from the 2021 IRC table: 2x8 to 2x12 at 16 or 24 inch centers, and see if your 13 or 1
- Floor Replacement Cost Calculator Price a floor replacement by material, room size, tear-out and subfloor prep. See installed cost per square fo
- Flooring Calculator Measure your room, add the right waste factor, and see the square feet to order, how many boxes to buy, and wh
- Framing Calculator Count studs at 16 or 24 inches on center, add corners and openings, and turn 72 feet of plate into 5 boards of
- French Drain Calculator Size a French drain before you dig: enter trench length, width and depth to get soil out, gravel needed in bag
- Furnace Size Calculator Work out what size furnace your house needs. Enter square footage, DOE climate zone and insulation to get outp
- Furniture Fit Calculator Check whether a sofa, dresser or fridge fits through your door. Enter the opening and the item size to get the
- Gambrel Roof Calculator Estimate gambrel roof area, shingle bundles, underlayment, rafter lengths and cost from building width, both s
- Generator Power and Sizing Calculator Generator sizing calculator: total running and starting watts for your outage load, a suggested generator clas
- Generator Size Calculator Add up running watts, size the surge for your biggest motor, and get the generator wattage to buy, with 25% he
- Grass Seed Calculator Work out how many pounds of grass seed your lawn needs for new seeding or overseeding, by grass type, with bag
- Gravel Calculator Enter your area, depth and stone type to get cubic yards, tons, bag counts and cost, with a compaction allowan
- Grout Calculator Enter tile size, joint width and depth, and square footage to see how many pounds of grout your tile project n
- HVAC Operating Cost Calculator Estimate what your air conditioner and furnace cost to run per hour, month and year. Enter tonnage, SEER2, AFU
- Heat Pump Operating Cost Calculator Calculate annual heating and cooling costs for a heat pump. Compare HSPF2 and SEER2 ratings, electric rates, a
- Herbicide Mixing Calculator Turn a label rate and spray volume into the exact herbicide per gallon, the product and water for your area, a
- Home Battery Storage Cost Calculator Calculate home battery storage costs including LFP vs NMC chemistry, inverter balance of system, labor, and th
- Hot Tub Cost Calculator Add up the real cost of a hot tub: the $6,000 purchase, about $80 a month for electricity and chemicals, and w
- House Demolition Cost Calculator Estimate house demolition costs by square footage, foundation type, abatement and debris hauling. See what a t
- How Many Solar Panels Do I Need? Solar panel calculator: enter yearly kWh, panel wattage and sun hours to see how many panels you need, the sys
- How Much Paint for a Room Enter your room size, coats and openings to see exactly how many gallons of paint to buy, plus a cost estimate
- Insulation Calculator Find out how much insulation to add to your attic. Enter your area, climate zone and material to get the R-val
- Irrigation System Cost Calculator Price a lawn sprinkler system by zone. A 5 zone system on 6,000 square feet runs $4,365 installed, plus $729 a
- LED Savings Calculator See what swapping to LED bulbs saves you a year, how many months until the bulbs pay for themselves, and the C
- Laundry Detergent Calculator Work out how much laundry detergent one load needs from your washer type, load size, soil level, water hardnes
- Lawn Fertilizer Calculator: NPK Rates and Spreader Settings Calculate exact fertilizer bag weight, nitrogen application rates, and spreader settings for your lawn area ba
- Lawn Mowing Calculator Price a lawn cut in seconds: enter square footage, add slope and obstacle time, and compare the season cost of
- Leaky Faucet Drip Calculator Count your drips per minute and see the gallons a leaky faucet wastes a day and a year, plus what the water an
- Lumber Weight Calculator Estimate lumber weight by species, size and moisture: how much a 2x4 or a whole stack weighs, with board feet
- Marble Flooring Cost Calculator Estimate marble flooring costs per square foot, including stone materials, setting labor, waste, and subfloor
- Material Cost Calculator Price a materials list with a waste factor, box or bundle rounding, sales tax and delivery, then see the all i
- Metal Roof Cost Calculator Price a metal roof in seconds: enter your roof area, pick corrugated or standing seam, and see the installed c
- Mulch Calculator Enter bed size, shape and depth to get cubic feet, cubic yards, bags of mulch and the cost, with a coverage ta
- Mulch Depth Calculator Mulch calculator: enter your bed size and depth to see cubic feet, cubic yards, bags needed and the cost, with
- Mural Cost Calculator Estimate a painted mural by wall size, detail level, surface prep, design fee, lift rental, and sealant. See p
- Nitrogen Fertilizer Calculator Work out how much fertilizer to spread on your lawn. Enter the area, the nitrogen rate per 1,000 square feet a
- Overseeding Calculator Overseeding calculator: enter your lawn size and grass type to get the pounds of grass seed you need, plus how
- Paint Cost Calculator Paint cost calculator: enter your room size, number of coats and price per gallon to see how many gallons of p
- Paint Coverage Calculator Find out how many gallons of paint a room needs. Enter the walls, subtract doors and windows, add a second coa
- Patio Cover Cost Calculator Estimate patio cover costs across aluminum, wood, and vinyl materials. Compare square foot pricing, attached s
- Paver Calculator Enter your patio size and paver dimensions to see how many pavers you need, including cutting waste by pattern
- Paver Layout Pattern Calculator Estimate pavers, pattern waste, area, and base materials for herringbone, running bond, basketweave, and Frenc
- Pea Gravel Calculator Work out how much pea gravel your project needs. Enter length, width and depth to get cubic yards, tons, bags
- Plywood Calculator Work out how many 4x8 plywood sheets your floor, wall or shed needs: area divided by sheet size plus a 10 perc
- Pool Removal Cost Calculator Estimate pool removal costs for partial fill-in or complete demolition. Compare excavation, backfill, hauling,
- Pool Shock Calculator Work out how much pool shock to add: enter gallons and chlorine readings to get the cal-hypo, dichlor or liqui
- Pool Volume Calculator Enter your pool's length, width and shallow and deep end depths to get gallons, liters, surface area, refill t
- Post Hole Concrete Calculator Post hole concrete calculator: enter hole diameter, depth and post size to see cubic feet of concrete and how
- Potting Soil Calculator Find out how much potting soil your pots and planters need. Enter the size and get dry quarts, cubic feet and
- Propane Tank Life Calculator Enter your tank size, fill level and appliance BTU rating to see how many hours of grilling or heating you get
- Propane vs Electric Heat Cost Compare propane and electric heating costs in dollars per million BTU. Enter your fuel prices and efficiency t
- Rafter Length Calculator Enter the building span and roof pitch to get the common rafter length with the run, rise and pitch factor sho
- Raised Bed Soil Calculator Find the cubic feet of soil a raised bed needs from its length, width and depth, plus how many 2 cubic foot ba
- Rebar Material Calculator Count rebar for a concrete slab: enter size and grid spacing to get bar counts, total feet, 20 foot sticks, we
- Rebar Weight Calculator Total rebar weight from bar size, length and count: 1.043 lb per foot for #5, waste and lap allowance, cost pe
- Retaining Wall Calculator Size a block retaining wall from its length and height: block count, gravel behind the wall, geogrid area and
- Rewire Cost Calculator Estimate a whole house rewire by square foot, with the panel upgrade, new circuits, wall repair and permit fee
- River Rock Calculator Enter your bed size and depth to get the cubic yards, cubic feet, tons and bags of river rock you need, with a
- Roof Pitch Calculator Free roof pitch calculator. Enter rise and run, a pitch, or an angle to get the X:12 pitch, degrees, slope per
- Roofing Calculator Turn your roof footprint into shingle squares and bundles: enter length, width and pitch, and see roof surface
- Roofing Labor Cost Per Square Calculator Estimate roofing labor per square. Crew hours times a loaded rate from BLS roofer wages with pitch multipliers
- Room Size Calculator Turn length and width into square feet, then get paint gallons and cooling BTU for the same room. Handles L-sh
- Round Pool Volume Calculator Enter your round pool's diameter and shallow and deep end depths to get its volume in gallons, plus the real d
- Roundup Mixing Calculator Work out how much glyphosate concentrate goes in your sprayer. Enter your label rate and tank size to get ounc
- Sand Calculator Enter length, width and depth to get sand volume in cubic feet and yards, weight in pounds and tons, 50 lb bag
- Sandbox Sand Calculator Work out how many pounds or bags of play sand your sandbox needs. Enter the length, width and depth to get the
- Seed Germination Time Chart Free seed germination chart: days to sprout, the soil temperature each vegetable wants and when to start seeds
- Seed Starting Date Calculator Seed starting date calculator: enter your last frost date and pick a crop to see the exact day to start seeds
- Septic System Cost Calculator Estimate the installed cost of a new septic system: tank, drain field sized by soil and bedrooms, permits, sit
- Shower Cost Calculator Shower cost calculator: see what one shower costs in water and heat, with monthly and yearly totals for electr
- Sod Calculator Work out how many square yards and pallets of sod your lawn needs, with a waste allowance, editable pallet cov
- Sod Weight Calculator Estimate sod weight in pounds and tons from your lawn size, with rolls, slabs and pallets, using extension fig
- Sod vs Seed Calculator Compare the cost of sod and grass seed for your lawn. Enter the square footage, sod price and seed rate to see
- Space Heater Cost Calculator See what a 1,500 watt space heater costs per hour, day and month at your electric rate, plus a table comparing
- Spray Foam Insulation Cost Calculator Estimate spray foam insulation cost from square footage, depth and foam type. Open-cell and closed-cell board
- Sprinkler Run Time Calculator Work out how long to run each sprinkler zone. Enter your precipitation rate and how much water your lawn needs
- Square Foot Garden Calculator Plan a square foot garden bed: enter your bed size and crop to get plants per square, total plants, and how mu
- Square Footage Calculator Work out square feet for a room, an L shape, a circle or a triangle, add a waste factor, then convert to squar
- Square Inches Calculator Find square inches from length and width, convert to square feet or centimeters, and size furnace filters, pan
- Stair Calculator Turn a total rise into equal risers and treads, get the total run, stringer length and stair angle, and check
- Stair Calculator Enter your total rise to get the number of steps, exact riser height, tread depth and total run, checked again
- Stud Spacing Calculator Count the studs a wall needs at 16 or 24 inches on center, add corners and openings, and price the 2x4 boards
- Sunroom Cost Calculator Estimate a sunroom addition by size and type, add foundation, HVAC, electrical and permit costs, then see the
- Tile Adhesive Calculator Work out how much thinset mortar you need for a tile job. Enter the area, trowel notch and bag size to get the
- Tile Calculator Enter the room and tile size to get how many tiles and boxes to buy, with a grout joint and waste for straight
- Tree Height Calculator Estimate tree height without climbing: use the shadow ratio or the 45 degree angle method with your own measur
- Tree Removal Cost Calculator Estimate tree removal cost by height, trunk diameter, and hazard level. See stump grinding, log hauling, and p
- Wall Area Calculator Add up wall square footage for any room, subtract doors and windows, and include a gable triangle. Get the exa
- Wallpaper Calculator Enter room size, ceiling height and pattern repeat to get the number of wallpaper rolls, the usable coverage p
- Washer Load Size Calculator Convert washer drum size in cubic feet to pounds of dry laundry, see the 80 percent fill limit, and find how m
- Water Heater Size Calculator Work out what size water heater your home needs. Enter your household size and hot water habits to get the fir
- Welding Cost Calculator Price a weld per foot from deposited metal, filler, gas, power, labor hours and overhead. Compare MIG, TIG and
- When to Aerate Lawn When should you aerate your lawn? Get month windows for cool-season and warm-season grass, hole counts per squ
- When to Apply Fertilizer When to apply fertilizer: nitrogen rates and month by month feeding windows for cool season and warm season la
- When to Plant Tomatoes by Zone Find when to plant tomatoes by zone and last frost date. Get safe transplant windows, the 60 degree soil rule,
- Whole House Fan Size Calculator Work out what size whole house fan you need. Enter your home size and ceiling height to get the CFM, the attic
- Window AC Size Calculator Find the right window air conditioner size. Enter your room's square footage and sun exposure to get the BTUs
Kids School
- ACT Score Calculator Calculate your ACT composite score, superscore, and STEM average. Convert section scores, explore SAT concorda
- ACT Score Calculator Turn English, math and reading scores into an ACT composite. See the rounding, the legacy four section score a
- Back to School Budget Calculator Build a per student back to school budget by grade, split the school list from the home shopping, and see what
- Back to School Countdown Count the days, weeks and weekdays until the first day of school, plus the dates to start shopping, book physi
- College Cost Calculator Add tuition, housing, books and fees, then grow each year to see the real four-year total and how far in-state
- College GPA Calculator Enter each course, its credit hours and your letter grade to see your term GPA weighted by credits, plus what
- Cumulative GPA Calculator Free cumulative GPA calculator: add this term's grades and credits to your current GPA and see your new cumula
- Exam Score Calculator Turn question points into an exam percentage and letter grade, then see what a flat, square root or half-misse
- Final Grade Calculator Find the score you need on your final: enter your current grade, the exam weight and your target, and see the
- Final Grade Calculator: Score Needed on the Final Enter your current grade, the final exam weight and the grade you want, and see the exact score you need, plus
- GPA Calculator Add each course, its grade and its credits to get your GPA on the 4.0 scale, plus the grades you need next ter
- GPA to Letter Grade Calculator Turn a 4.0 scale GPA into a letter grade: see the band for A through F, what A- and B+ are worth, and how scho
- GPA to Percentage Converter Convert any GPA to a percentage on the 4.0, 5.0 and 10.0 scales. See the letter band, the piecewise and linear
- Grade Calculator Turn your scores into a course grade: points earned, points possible, percent, letter grade and grade points,
- Grading Scale Chart Free grading scale chart: turn a percentage or points score into a letter grade, GPA points and the next grade
- Graduation Year Calculator Free graduation year calculator: enter your grade and school year to see the exact year you will graduate high
- High School GPA Calculator Calculate high school GPA from letter grades and credits. Weighted and unweighted scales, AP and honors bonuse
- High School GPA Calculator Calculate your high school GPA on the 4.0 scale: enter grades and credits for unweighted GPA, or add AP and ho
- Homework Time Calculator Free homework time calculator: add up assignments, reading pages and writing length to see how long tonight's
- How Does Grading on a Bell Curve Work? See how a bell curve turns raw scores into z-scores and percentiles, with a worked 85 out of a class averaging
- How Many Questions Can I Miss? Free test score calculator: enter how many questions are on the quiz and the grade you need, and see exactly h
- Lexile to Grade Level Convert a Lexile score to a grade level band, see why one score spans 2 or 3 grades, and get the independent r
- Percentage to GPA Calculator Turn any class percentage into a GPA on the 4.0 scale in one click. See the letter grade, honors and AP weight
- Reading Level Converter Convert reading levels between Lexile, Fountas & Pinnell (A, Z), DRA, Accelerated Reader and grade level with
- Roman Numeral Converter Convert numbers from 1 to 3999 into Roman numerals and decode Roman strings, with subtractive pairs, examples,
- SAT Score Calculator Convert SAT raw scores to scaled section scores from 200 to 800, add them for a 400 to 1600 total, and build a
- Scatter Plot Calculator Plot paired X and Y values, inspect the pattern, and calculate Pearson correlation with this browser-based sca
- Scientific Notation Converter Convert numbers to scientific, engineering, and E notation, or calculate with two values in this browser-based
- Semester Grade Calculator Calculate your weighted semester grade from quarters and final exam scores. Find what exam grade you need to e
- Semester Grade Calculator Enter each category weight and score to get your semester grade, then see the exact final exam score you need
- Standard Deviation Calculator Calculate sample or population standard deviation from a list of numbers, with the mean, variance, squared dev
- Test Grade Calculator Turn a raw test score into a percentage and a letter grade. Handles any question count, weighted points, blank
- Test Score Calculator Turn 43 out of 50 into 86%, see the letter grade, and combine weighted categories like homework, quizzes and a
- Unweighted GPA Calculator Free unweighted GPA calculator: enter your letter grades and credit hours to get your GPA on the standard 4.0
- Weighted GPA Calculator Add your courses, grades and credits to see weighted and unweighted GPA side by side, with AP and honors bonus
- What Does It Mean to Grade on a Curve? Grading on a curve redistributes class scores instead of changing right answers. See how the bell curve works,
- What Grade Do I Need on the Final? Find the exact score you need on a final, quiz or exam to hit your target grade. Enter your current grade and
- Words per Minute Calculator Divide words by minutes to get reading or typing words per minute, with grade level fluency benchmarks and net
Kitchen
- Air Fryer Conversion Calculator Convert conventional oven recipes for an air fryer. Adjust baking temperature, calculate reduced cooking time,
- Air Fryer Time and Temperature Calculator Convert an oven recipe to your air fryer in one step. Drop the temperature 25 F and cut the time by 20%, then
- Air Fryer to Oven Converter Air fryer to oven converter: turn any air fryer temperature and time into the oven setting, add 25°F and about
- Alcohol Dilution Calculator Work out how much water to add to bring spirits down to a target strength. Uses C1V1 = C2V2 and converts proof
- BBQ Grill Size Calculator Work out the grate area a cookout needs: 72 square inches per adult, 60% of that per child, then the grill siz
- BBQ Party Calculator Enter adults, children and party hours to get the raw meat, sides, buns, drinks and ice a cookout needs, plus
- Baby Milk Intake Calculator Work out how much breast milk or formula a baby needs by weight and age: daily ounces, ounces per feeding, fee
- Baking Powder Substitute Calculator Out of baking powder? Use 1/4 tsp baking soda plus 1/2 tsp cream of tartar for every teaspoon. Enter what the
- Bread Hydration Calculator Enter flour and water weights to get exact hydration, baker's percentage and dough weight, plus the water need
- Bread Machine Recipe Ratio Calculator Scale any basic bread machine loaf: about 5 parts flour to 3 parts water, with yeast, salt and sugar amounts a
- Bread Spread Calculator: Butter and Cream Cheese Work out how much butter or cream cheese a bread table needs. Enter guests and slices per person to get grams,
- Brine Calculator Free brine calculator: work out exactly how much salt and water a wet brine or dry brine needs, in grams, cups
- Brown Sugar Cups to Grams Convert cups of brown sugar to grams and back. One packed cup is about 213 grams, with a quick chart for 1/4,
- Brown Sugar Substitute Calculator Out of brown sugar? Get exact substitutes: white sugar plus molasses, honey, maple syrup or coconut sugar, wit
- Butter Calculator Convert butter between sticks, cups, tablespoons, grams and ounces, see calories from USDA data and count how
- Butter Stick to Grams Converter One US stick of butter is 113 grams, 1/2 cup or 8 tablespoons. Convert sticks, cups, tablespoons and blocks to
- Buttermilk Substitute Calculator Make buttermilk at home: 1 tablespoon of lemon juice or vinegar per cup of milk, rested 5 minutes. Yogurt and
- Cake Flour Substitute Calculator Out of cake flour? Make it from all-purpose flour and cornstarch: use 1 cup of flour minus 2 tablespoons, plus
- Cake Pricing Calculator Price a cake from real cost: ingredients, packaging, overhead, your hours, profit margin and platform fees. Se
- Candy Temperature Chart Candy temperature chart with every stage from thread to hard crack in Fahrenheit and Celsius, plus altitude an
- Chicken Thigh Cooking Time Calculator Free chicken thigh cooking time calculator: pick your cut and method to get the exact oven, air fryer or grill
- Chocolate Chips Cups to Grams Converter Convert cups of chocolate chips to grams, ounces and tablespoons, or go from grams back to cups. Regular, mini
- Cocoa Powder Cups to Grams Convert cocoa powder from cups to grams and back. One US cup is about 86 grams, but a scooped cup can hit 96.
- Coffee to Water Ratio Calculator Pick a ratio and a cup size to get the exact coffee dose in grams and tablespoons. A 12 oz cup at 1:16 needs 2
- Convection Oven Conversion Calculator Convert any recipe for a convection oven: drop the temperature 25°F and shorten the bake about 20%, with a ful
- Cookie Cost Calculator Calculate exact cookie batch costs, per-unit ingredient expenses, baker labor, packaging, overhead, and profit
- Cooking Conversion Calculator Convert cups, tablespoons, milliliters and grams for any recipe: 1 cup is 236.588 mL, and flour, sugar and hon
- Cornstarch Substitute Best cornstarch substitutes and the exact ratio for each: all-purpose flour at 2 times, arrowroot and potato s
- Cream Cheese Substitute Need a cream cheese swap? Enter how much the recipe needs and see the exact amount of Greek yogurt, ricotta, c
- Cupcake Cost Calculator Cost out a batch of cupcakes with 2026 average prices: ingredients, labor, oven power, packaging, waste, and t
- Cups to Quarts Converter Convert cups to quarts and back in one step. One US quart is 4 cups, 32 fl oz or 946 mL, and the converter als
- Dry to Cooked Pasta Calculator Convert dry pasta weight to cooked ounces, grams and cups by shape. 8 oz of dry spaghetti becomes 17.6 oz, or
- Egg Boiling Time Calculator Egg boiling time calculator: pick egg size, start temperature and doneness to get exact minutes for soft, jamm
- Egg Freezing Calculator How to freeze raw eggs: whites, yolks and whole eggs keep 12 months at 0°F, plus the salt or sugar ratio that
- Egg Substitute Calculator Free egg substitute calculator: see how much flax, chia, applesauce, banana or aquafaba replaces 1 egg, 2 eggs
- Flour Cups to Grams Converter Convert cups of flour to grams and back. One cup of all-purpose flour is 125 grams, and scooping instead of sp
- Fluid Ounces to Pounds Conversion Convert fluid ounces to pounds by liquid: 16 fl oz of water is 1.04 lb, honey 1.48 lb and vegetable oil 0.96 l
- Food Cost Percentage Calculator Calculate restaurant food cost percentage, menu pricing, portion cost, and gross profit margin with inventory
- Food Freezer Storage Chart Free freezer storage chart: look up how long beef, chicken, fish, soups and leftovers stay good in the fridge
- Food Safety Temperature Chart Safe minimum internal cooking temperatures for chicken, beef, pork, fish, eggs and leftovers, in °F and °C, wi
- Fraction to Cups Converter Free fraction to cups converter. Enter any fraction of a cup and see the exact tablespoons, teaspoons and mill
- Freezer Burn Guide How long food keeps in the freezer and when freezer burn sets in. Pick a food, enter the months stored and see
- Fresh to Dry Herb Conversion Calculator Swap fresh herbs for dried without wrecking dinner. Enter a fresh amount and get the dried or ground equivalen
- Fridge Temperature Checker Check your fridge and freezer temperatures against the USDA safety limits, and see how long food stays safe wh
- Grams to Calories Calculator Turn protein, carb and fat grams into calories with the 4-4-9 Atwater factors, then run the math backward from
- Grams to Fluid Ounces Converter Convert grams to US fluid ounces by liquid: 100 g of water is 3.38 fl oz, but honey and oil differ. Pick the l
- Grams to Moles Calculator Turn grams into moles and back with a molar mass table for salt, sugar, baking soda and more, plus millimoles,
- Grams to Tablespoons Calculator Convert grams to tablespoons for flour, sugar, butter, and 10 ingredients. See exact USDA densities like 14.18
- Grams to Tablespoons Converter Convert grams to tablespoons by ingredient: water is 15 g per tbsp, flour 7.8, honey 21.25. See why density ch
- Grams to Teaspoons Converter Convert grams to teaspoons the right way: pick the ingredient, because salt is 5.9 g per teaspoon and sugar 4.
- Green Bean Casserole for 20 Green bean casserole for 20 people: see how many cans of soup, cups of milk, cups of beans and cans of fried o
- Half Recipe Calculator Half recipe calculator: enter any ingredient amount to scale a recipe down, cups, tablespoons, grams and more,
- Half of 1/2 Cup (and Every Other Measurement) Half of 1/2 cup is 1/4 cup, or 4 tablespoons. Halve, third or quarter any recipe amount and see it in cups, ta
- Half of 1/3 Cup Half of 1/3 cup is 1/6 cup, which is 2 tablespoons plus 2 teaspoons. Halve, double or third any recipe amount
- Half of 1/4 Cup Half of 1/4 cup is 2 tablespoons, 6 teaspoons, 1 fluid ounce or 29.57 mL. Halve, third or double any cup measu
- Half of 2/3 Cup Half of 2/3 cup is 1/3 cup, which is 5 tablespoons plus 1 teaspoon, or 16 teaspoons. Enter any recipe amount a
- Ham Cooking Time Calculator Free ham cooking time calculator: enter your ham's weight and type to get minutes per pound, the right oven te
- Ham Size Calculator Enter your guest count and get the ham size to buy in pounds and kg, with bone-in and boneless amounts per per
- Honey Grams to Tablespoons Convert honey grams to tablespoons, teaspoons and cups. One tablespoon of honey weighs about 21 grams, so 250
- How Long Can Food Sit Out? Perishable food can sit out 2 hours at room temperature, or 1 hour above 90 F. Enter your time and temperature
- How Long Does Ground Beef Last? Ground beef lasts 1 to 2 days in the fridge and 3 to 4 months in the freezer. Check the storage times, safe th
- How Long Does Rice Last? How long does rice last? See fridge, freezer and pantry shelf life for cooked and dry rice, plus a use-by date
- How Long Is Chicken Good in the Fridge? Raw chicken keeps 1 to 2 days in the fridge and cooked chicken 3 to 4 days at 40 degrees or below. Check any d
- How Long to Bake a Potato A medium 12 oz russet takes 50 to 60 minutes at 400 F. Get bake times by potato size and oven temperature, plu
- How Many Chicken Wings Per Person? Plan 4 to 6 wings per person as an appetizer and 8 to 12 as a main dish. Get the piece count, the pounds to bu
- How Many Cups in a Gallon? One US gallon holds 16 cups, 4 quarts, 8 pints or 128 fluid ounces. Convert gallons to cups for recipes, punch
- How Many Cups in a Pound Cups per pound for flour, sugar, butter and 15 more ingredients, with the gram weights behind each number and
- How Many Cups in a Quart? One US quart equals exactly 4 cups. Convert quarts, cups, pints, fluid ounces and milliliters with a free calc
- How Many Ounces in a Cup One cup is 8 fluid ounces, but a cup of flour weighs 4.4 oz and honey 12 oz. Convert cups, fluid ounces, table
- How Many Pizzas for 20 People? Twenty adults need about 8 large pizzas. See the slice math, how kids and side dishes change the count, and wh
- How Many Servings Are in a Cake? A standard 8 inch round cake serves 20 party slices or 24 wedding slices. See full servings by tier size, shap
- How Many Tablespoons in a Cup One US cup equals 16 tablespoons or 48 teaspoons. Convert any cup fraction to tablespoons, compare metric and
- How Much Coffee Per Cup Get the exact grams, tablespoons and scoops for your mug size and brew method, plus the caffeine in each cup a
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- How Much Turkey Per Person Work out turkey weight for your table: 1 pound per person for a whole bird, 1.5 with leftovers, half a pound f
- Instant Pot to Slow Cooker Converter Convert a slow cooker recipe to Instant Pot pressure time, or turn pressure minutes back into slow cooker hour
- Leftover Reheating Time Calculator Reheating leftovers: get a safe target temperature of 165°F and estimated times for the microwave, oven, stove
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- MG to Teaspoon Converter Convert milligrams to teaspoons by ingredient: salt 6,080 mg, sugar 4,170 mg and flour 2,600 mg per level teas
- Mashed Potatoes Per Person Calculator Plan mashed potatoes for any crowd: about 0.5 lb of potatoes per person, plus butter and milk amounts worked o
- Meat Cooking Time Calculator Free meat cooking time calculator: pick beef, pork, lamb or poultry, enter the weight, and get minutes per pou
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- Milk Substitute for Baking Out of milk? Enter the cups your recipe needs and see the exact amount of buttermilk, yogurt, evaporated milk
- Molasses Substitute Out of molasses? Enter the amount you need and get the exact swap in brown sugar, dark corn syrup, honey, mapl
- Oil to Butter Converter Convert oil to butter and butter to oil in cups, tablespoons or teaspoons. Butter is about 80% fat, so 3/4 cup
- Oven to Air Fryer Converter Convert any oven recipe to the air fryer: lower the temperature by 25 F and the time by 20 percent, with categ
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- Pizza Calculator Count adults and kids, get the number of pizzas to order at any size, based on 3 slices per adult and 2 per ch
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- Plate Cost Calculator Add ingredient pack prices, yields and a Q factor to get plate cost, food cost percentage and the menu price t
- Powdered Sugar Cups to Grams Convert powdered sugar from cups to grams and back. One cup of confectioners' sugar is about 120 grams, so 1/2
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- Self-Rising Flour Substitute Make self-rising flour at home: each cup is 1 cup all-purpose flour, 1 1/2 teaspoons baking powder and 1/2 tea
- Slow Cooker to Oven Converter Convert slow cooker recipes to conventional oven bake times and temperatures. Calculate Dutch oven braising ti
- Sodium in Salt How much sodium is in salt by type and amount: one level teaspoon of table salt has about 2,358 mg of sodium,
- Sour Cream Substitute Calculator Out of sour cream? Enter how much your recipe needs and get the exact amount of Greek yogurt, buttermilk, cott
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- Steak Cook Time Calculator Enter steak thickness and target doneness to get total grill minutes, the internal temperature to pull it at,
- Stuffing Per Person Calculator Free stuffing per person calculator: enter your guest count and portion size to get the cups of stuffing, boxe
- Sugar Cups to Grams Converter Convert cups of sugar to grams for granulated, brown, powdered and raw sugar. Cup to gram chart, per tablespoo
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- Turkey Cooking Time Calculator Get USDA based turkey roasting hours at 325 F, stuffed or unstuffed, plus the 165 F pull temp, the rest time a
- Turkey Size Calculator Enter your head count to get the turkey size to buy, plus the USDA oven window at 325 F, the fridge thaw count
- Turkey Thawing Time Calculator Enter your turkey's weight to get USDA-based thawing times: about 24 hours per 4 to 5 lb in the fridge, or 30
- Uncooked to Cooked Rice Calculator Enter dry rice in grams or cups and get the cooked weight, cooked cups, and calories, from USDA FoodData Centr
- Vanilla Extract Substitute No vanilla extract? Get the exact swap for vanilla bean, bean paste, powder, imitation vanilla, maple syrup an
- What Is Half of 3/4 Cup? Half of 3/4 cup is 6 tablespoons, or 1/4 cup plus 2 tablespoons. Halve, third or double any recipe amount and
- Yeast Converter: Fresh, Active Dry and Instant Yeast Convert fresh cake yeast, active dry yeast and instant yeast by grams, teaspoons and packets, with water tempe
- cc to Grams Converter Convert cc to grams for flour, sugar, honey, butter and more. One volume, one density per ingredient, plus the
- mL to Tablespoon Converter Convert milliliters to tablespoons in one step: the US tablespoon is 14.79 mL, the Australian one is 20 mL, an
Math
- 0.125 as a Fraction 0.125 as a fraction is 125/1000, which cancels to 1/8. See the slot weights, the 1/8 inch bit chart, metric su
- 0.2 as a Fraction 0.2 as a fraction is 2/10, which shrinks to 1/5. See the tenths column, the 20 percent link, a 50/30/20 saving
- 0.25 as a Fraction 0.25 as a fraction is 25/100, which cuts to 1/4. See the hundredths column, the 25 cent coin, quarter cup meas
- 0.375 as a Fraction 0.375 as a fraction is 375/1000, which strips to 3/8. See Euclid's divisions, the sixteenth grid, 3/8 wrench a
- 1/10 as a Decimal 1/10 is 0.1 as a decimal and 10 percent. See the long division, the place value, the tenths table, and why the
- 1/10 as a Percent 1/10 as a percent is 10 percent. See the division step, a tenths conversion table, and worked examples for dis
- 1/16 as a Decimal 1/16 as a decimal is 0.0625, the shortest mark on a standard inch ruler. See the long division, all sixteen ma
- 1/16 as a Percent 1/16 as a percent is 6.25 percent. See the division, a sixteenths table, price and tape measure examples, and
- 1/5 as a Decimal 1/5 is 0.2 as a decimal and 20 percent. See the long division, the fifths table, the tip and down payment exam
- 1/6 as a Decimal 1/6 as a decimal is 0.1666 with the 6 repeating. See the long division, a sixths table, rounding rules and wha
- 1/6 as a Percent 1/6 is 16.67 percent, rounded from 16.666... See the long division, a rounding table, every sixth in one table
- 1/7 as a Decimal 1/7 as a decimal is 0.142857, and the six digits repeat forever. See the long division, every seventh, roundin
- 1/8 as a Decimal 1/8 as a decimal is 0.125, a terminating decimal because 8 is a power of 2. See both conversion methods, an ei
- 1/8 as a Percent 1/8 as a percent is 12.5 percent. See the three steps, an eighths table, what 12.5 percent off costs at the re
- 1/9 as a Decimal 1/9 as a decimal is 0.111... with the 1 repeating forever. See the long division, the ninths family, rounding
- 1/9 as a Percent 1/9 as a percent is 11.11%, rounded from 11.1111... percent. See the division, the ninths ladder, worked money
- 11/16 as a Decimal 11/16 as a decimal is 0.6875, exact in four digits. See the long division, the sixteenths table, the 17.4625 m
- 13/16 as a Decimal 13/16 as a decimal is 0.8125, an exact four place decimal. See the long division, the sixteenths table, millim
- 15/16 as a Decimal 15/16 as a decimal is 0.9375, an exact four place answer. See the long division, the sixteenths table, the 93.
- 18 Electron Rule Calculator Pick a metal, set its oxidation state and ligands, and get the d electron count plus the total valence electro
- 2 Sample Z Test Calculator Free 2 sample z test calculator. Enter two means, standard deviations and sample sizes to get the z statistic,
- 2/5 as a Decimal 2/5 as a decimal is 0.4, a decimal that stops. See the one step division, the fifths family, 40 percent, money
- 2/5 as a Percent 2/5 as a percent is 40%, an exact conversion with no rounding. See the division, the fifths ladder, and worked
- 2/7 as a Decimal 2/7 as a decimal is 0.285714 with the six digits repeating forever. See the long division, the rounding ladder
- 2/7 as a Percent 2/7 as a percent is 28.57%, rounded from 28.571428 percent. See the division, the 142857 block, the rounding l
- 2/9 as a Decimal 2/9 as a decimal is 0.2222 repeating, written 0.2 with a bar. See the division, the exact and rounded forms, a
- 2/9 as a Percent 2/9 as a percent is 22.22%. See the division, the repeating decimal 0.222..., two ninths of common amounts, an
- 30-60-90 Triangle Calculator Solve any 30-60-90 triangle from one known side. Enter the short leg, long leg or hypotenuse and get the other
- 45-45-90 Triangle Calculator Solve any 45-45-90 right triangle from one side. Enter a leg or the hypotenuse and get the other sides, the ar
- Absolute Change Calculator Measure the change between two numbers with the new minus old rule. Get the signed result, the size of the mov
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- Angle Between Two Vectors Calculator Find the angle between two 2D or 3D vectors. The calculator returns the dot product, both magnitudes, the cosi
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- Angular Velocity Calculator Convert rpm to rad/s and back, get turns per second and period, and turn spin into rim speed with v = r x omeg
- Arc Length Calculator Enter a radius and a central angle to get the arc length, the chord, the sector area and the share of the circ
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- Arctan: Series, Identities and Exact Values Arctan beyond the button: the Gregory series, the 90 degree complement identity, the addition rule, and Machin
- Area of a Sector Calculator Enter a radius and a central angle in degrees or radians to get the sector area, the arc, the chord, the segme
- Atoms to Moles Calculator Convert a particle count to moles or moles to atoms with the exact Avogadro constant. Works from grams too, an
- Average Calculator Paste a list of numbers to get the mean, median, sum, count, range and a weighted average when some values cou
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- Average Velocity Calculator Find average velocity from distance and time in mph, km/h, m/s or ft/s, split a trip into legs, and see why av
- Base Calculator Convert numbers between base 2 to 36, read place values, and add, subtract or multiply in any base with the ca
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- Binary Calculator Add, subtract, multiply or divide binary numbers and convert between binary, decimal, hex and octal, with the
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- Central Limit Theorem Calculator Find the standard error, the z-score of a sample mean and the chance of landing above it, plus the sample size
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- Characteristic Polynomial Calculator Find the characteristic polynomial and eigenvalues of a 2x2, 3x3 or 4x4 matrix, with trace, determinant and Ca
- Charles's Law Calculator Solve Charles's law for any missing volume or temperature, with Kelvin conversion built in, plus worked balloo
- Chemistry Solve any dilution by filling in three of four values. Moles, molarity and the C1 V1 = C2 V2 equation, with wo
- Circle Calculator Circle calculator: enter a radius, diameter, circumference or area and get the other three, plus ring area, th
- Circumference Calculator Find a circle's circumference from its radius, diameter, or area, or work backward to the radius. Includes tir
- Circumference to Diameter Calculator Convert any circumference to its diameter by dividing by pi, with tape error ranges, unit tables and worked ex
- Class Width Calculator Enter the smallest and largest values and the number of classes. Get the range, the rounded-up class width and
- Coefficient of Determination Calculator Paste paired x and y data to get R squared, the correlation r, the least squares line, and a plain reading of
- Coefficient of Friction Calculator Find the coefficient of friction from a push test or an incline angle, get the friction force for a known mu,
- Coefficient of Variation Calculator Turn a mean and standard deviation into a coefficient of variation, compare relative spread of two data sets,
- Completing the Square Calculator Enter a, b and c to rewrite any quadratic in completed square form, read off the vertex and both roots, and fo
- Confidence Interval Calculator Build a confidence interval for a mean from raw data or a summary, for a share from a count, and work out the
- Convolution Calculator Compute the discrete convolution of two sequences step by step: every output, the n + m - 1 length rule and a
- Cosecant Calculator Get csc for any angle in degrees, radians or pi form, turn a sine value or two triangle sides into cosecant, a
- Cosine Calculator Get cos(x) in degrees or radians, solve a triangle with the law of cosines from three sides or two sides and a
- Cotangent Calculator Get the cotangent for any angle in degrees or radians, from a tangent, sine or cosine value, or from two trian
- Cross Product Calculator Enter two 3D vectors to get the cross product components, its magnitude, the angle between them, a unit normal
- Cube Root Calculator Enter any number to get its cube root as a decimal, plus the simplified radical form. Handles negatives, perfe
- Decimal to Fraction Calculator Convert a decimal to a fraction in lowest terms, with mixed numbers, repeating decimals and rounding to the ne
- Decimal to Octal Converter Convert decimal to octal by repeated division by 8, with a worked ladder, a chart from 0 to 512, fraction step
- Decimal to Percent Converter Convert any decimal to a percent by moving the point two places: 0.375 is 37.5 percent, and 6.25 percent is 0.
- Degrees of Freedom Calculator Find degrees of freedom for t tests, chi square, ANOVA and regression. See why 25 observations give df 24 and
- Dew Point Calculator Enter air temperature and relative humidity to get the dew point in Fahrenheit and Celsius, plus the spread, t
- Dividing Exponents Calculator Divide powers in one step: x^a over x^b equals x^(a-b). Calculator plus worked examples with negative exponent
- Dot Product Calculator Compute the dot product from components or from magnitudes and an angle: get magnitudes, the angle, the projec
- Electric Field Calculator Find the electric field from a point charge with E = k q / r squared, in N/C or V/m, and the force on a test c
- Empirical Probability Calculator Turn counts into an empirical probability: enter successes and trials to get the decimal, percent, reduced fra
- Empirical Rule Calculator Enter a mean and standard deviation to get the 68, 95 and 99.7 percent bands, the share outside each one, and
- Equation of a Line Calculator Find the equation of a line from two points, a point and a slope, or a slope and an intercept. Get both interc
- Equilateral Triangle Calculator Type one side, height, area, perimeter or radius to get the rest of an equilateral triangle: height, area, inr
- Equivalent Fractions Calculator Simplify any fraction, list its equivalent forms, check two fractions with cross products and find the least c
- Escape Velocity Calculator Calculate escape velocity from Earth, the Moon, Mars or any body, in km/s and mph, with orbital speed, surface
- Exponent Calculator Raise any base to any power, including negative and fractional exponents, and see the answer in scientific not
- Exponent Rules Calculator Apply all five laws of exponents to two powers at once: product, quotient, power of a power, zero and negative
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- FPE Calculator Turn grains and feet per second into foot-pounds of energy, get joules and momentum, and see the hunting thres
- Factorial Calculator Get n factorial exactly for any whole number up to 1000, plus digit count, trailing zeros, Stirling estimate,
- Factorial Calculator Factorial calculator for any n up to 170: get the exact value of n!, the digit count, trailing zeros and the l
- Fibonacci Calculator Generate Fibonacci numbers up to F(1000) exactly, with the running sum, digit counts and how close the ratio o
- Force Calculator Find force, mass or acceleration with F = ma, in newtons, pounds-force, kilograms-force and dynes, plus g-forc
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- Fraction Simplifier Type a fraction to reduce it to lowest terms and see the greatest common factor, the division steps, the mixed
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- Frequency Calculator Calculate frequency in hertz from cycles and time, then convert the result to period and angular frequency wit
- Friction Calculator Get friction force from a load and a coefficient, plus ramp hold and slide angles, push angle effects, sliding
- GCF Calculator Find the greatest common factor of two or three whole numbers, with the prime factors, the Euclidean steps and
- Gear Ratio Calculator Enter the tooth counts to get the gear ratio, output rpm and torque multiplication, then size a compound train
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- Golden Ratio Calculator Enter one length to get the golden ratio split, size a rectangle at 1.618, or check how far any width and heig
- Half-Life Calculator Find the amount left after any number of half-lives, the decay constant, the time to 1 percent left, or the ha
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- Hex Calculator Convert hex to decimal and binary, add, subtract, multiply or divide in base 16, and read any value as an 8, 1
- Horizontal Projectile Motion Calculator Get fall time, range, impact speed and landing angle for a level launch. Uses g = 9.80665 m/s2, with worked ex
- IQ Percentile Calculator Turn an IQ score into a percentile, with the z score, the share of people above it, the 1 in N rarity and the
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- Instantaneous Velocity Calculator Find the velocity at one instant from two close position readings, or from v = v0 + at. Answers in m/s, km/h,
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- Log Base 2 Calculator Find log base 2 of any positive number, with the change of base steps shown, the matching bit count and the ne
- Log Calculator Log calculator for any base: enter a number and a base to get log base b of x, with the base 10, base e and ba
- Magnitude of Acceleration Calculator Compute the magnitude of acceleration from vector components ax, ay and az, or from a velocity change over tim
- Margin of Error Calculator Turn a sample size and a percentage into a margin of error at 90, 95 or 99 percent, plus the sample size a tar
- Marks Percentage Calculator Turn marks into a percentage for one paper or three weighted papers, see the US letter grade and the CBSE grad
- Mass Percent Calculator Free mass percent calculator: enter the solute and solution mass to get percent by mass, grams per 100 g and p
- Matrix Transpose Calculator Paste a matrix and get its transpose instantly: rows become columns, a 2 x 3 matrix turns 3 x 2, with the (AB)
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- Mixed Number Calculator Add, subtract, multiply or divide mixed numbers and get the answer as a mixed number, an improper fraction and
- Molality Calculator Find molality in mol/kg from solute mass, molar mass and solvent mass, then get the freezing point, boiling po
- Molarity Calculator Find molarity from mass, volume and molar mass, work out the grams a target solution needs, and dilute a stock
- Mole Fraction Calculator Enter moles or grams for each component and get the mole fraction, mole percent, mass percent and partial pres
- Mole Ratio Calculator Turn a balanced equation's coefficients into moles and grams, with mole fraction, partial pressure and a limit
- Momentum Calculator Free momentum calculator: multiply mass by velocity to get momentum in kg m/s, with worked numbers for cars, b
- Multiplying Exponents Calculator Multiply powers with the same base by adding exponents, including negative and fractional powers, with a direc
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- Negative Exponents Calculator Calculate negative exponents as reciprocals, check zero and fractional powers, and see clear examples such as
- Normal Distribution Calculator Calculate normal distribution probabilities, z scores, percentiles, and ranges from a mean and standard deviat
- Normal Force Calculator Find the normal force on flat ground, a slope, an accelerating lift or under an extra push. Get the weight com
- On Base Percentage Calculator Work out on-base percentage from hits, walks, hit-by-pitches, at-bats and sacrifice flies, with the official M
- Outlier Calculator Paste a list of numbers to find outliers by interquartile fences, z-scores, the modified z-score and the Grubb
- P Value Calculator Turn a z score or a t score into a one-tailed and two-tailed p value, see the call at 0.05, and learn what the
- PPM Calculator Turn milligrams per liter, milligrams per kilogram or a diluted stock into parts per million, parts per billio
- PPM Converter Convert ppm to percent, ppb, mg/L and mg/kg, or run any of them back to ppm, with EPA drinking water limits an
- Pascal's Triangle Calculator Draw the first rows of Pascal's triangle, look up any cell C(n, k) with the working, and check row sums, diago
- Percent Decrease Calculator Enter old and new values to get the percent decrease, the dollar drop, the share that remains and the rebound
- Percent Error Calculator Compare a measured value with an accepted value to get percent error, the signed difference and percent differ
- Percent Off Calculator Find the sale price and the dollars saved from any percent off, then check the price per ounce after the disco
- Percent Yield Calculator Turn the limiting reactant into a theoretical yield in grams, then compare your actual product weight to get t
- Percent of Sales Calculator Find what percent of sales a cost, price or profit represents, then project the same ratio onto forecast sales
- Percent to Fraction Calculator Turn any percent into its simplest fraction, including repeating decimals like 33.333 percent, with the decima
- Percentage Calculator Work out a percent of a number, one number as a percent of another, percent change and the original value befo
- Percentage Calculator and Guide Learn what a percentage is, convert decimals, fractions and percents, and solve six percent problems. 18% of 2
- Percentage Change Calculator Find the percent change between two numbers. $24.99 to $31.49 is up 26.01%, $89 to $71 is down 20.22%. Handles
- Percentage Decrease Calculator Enter a starting value and a lower value to see the percent decrease, the size of the drop, the share left and
- Percentage Difference Calculator Compare pair of figures and get the percentage difference, using the midpoint of both quantities as the denomi
- Percentage of a Percentage Calculator Enter a base and two rates to get a percentage of a percentage, the combined percent, each stage and the missi
- Percentile Calculator Paste a list of numbers to get the percentile rank of any score and the value at the 10th, 25th, 50th, 75th or
- Perimeter Calculator Pick a shape, enter the sides or radius, and get the perimeter in feet, meters or inches, with the formula and
- Physics Calculator Calculate kinetic energy, momentum, distance, and an average force estimate from mass, velocity, and time with
- Pie Chart Calculator Enter up to six slice values and get the percent share and central angle of every slice, the total, the larges
- Point-Slope Form Calculator Enter a point and a slope to get the point-slope form, slope-intercept form and standard form of the line at o
- Poisson Distribution Calculator Poisson distribution calculator: enter a rate and a count to get P(X = k), P(X at most k), and P(X at least k)
- Polygon Calculator Regular polygon calculator: enter the number of sides and side length for area, perimeter, interior angles, ap
- Pooled Variance Calculator Combine two sample variances by degrees of freedom: sp^2 = ((n1-1)s1^2 + (n2-1)s2^2) / (n1+n2-2), with pooled
- Prime Factorization Calculator Factor any integer up to a trillion into primes with full trial division steps, plus divisor count, divisor su
- Probability Calculator Find the chance of A, B, both or either, plus conditional probability, odds and binomial results for repeated
- Probability Calculator Find the chance of A, B, both or either, plus conditional probability, odds and binomial results for repeated
- Pythagorean Theorem Calculator Solve a right triangle from any two sides: missing side, area, perimeter, angles and the 3D diagonal, with the
- Quadratic Equation Calculator Solve a quadratic equation to find real or complex roots, the discriminant, vertex, axis, factored form, and s
- Quadratic Formula Calculator Solve ax^2 + bx + c = 0 with both roots, the discriminant, the vertex and the factored form, including complex
- Quartile Calculator Enter a list of numbers to get Q1, the median, Q3, the interquartile range and any outliers, with the position
- Ratio Calculator Solve the missing number in A : B = C : D by cross multiplication, simplify a ratio to lowest terms, or split
- Ratio to Fraction Calculator Turn a ratio like 3:16 into both fractions at once: the share of the whole, 3/19, and the part-to-part value,
- Ratio to Percentage Calculator Turn any A to B ratio into a percentage. See the share of the whole and the A over B comparison, with fuel mix
- Relative Frequency Calculator Turn counts into relative frequencies as decimals and percents, with cumulative columns and joint, marginal an
- Remainder Calculator Divide two numbers and get the quotient, the remainder, the decimal answer and both sign conventions, with a c
- Resultant Force Calculator Combine two forces at an angle, or add a third, to get the resultant in newtons, its direction, the equilibran
- Reynolds Number Calculator Get the Reynolds number from density, velocity, length and viscosity, with unit conversion and the laminar, tr
- Right Triangle Calculator Solve a right triangle from any two sides, or one side and an angle. Get the third side, both angles, area, pe
- Root Calculator Calculate square roots, cube roots and nth roots with signed answers, exact formulas and clear worked examples
- Rounding Calculator Round numbers to decimal places or significant figures and compare half-up, ties-to-even, down, up, and toward
- SOHCAHTOA Calculator Use SOHCAHTOA to solve a right triangle from two sides or one side and an angle. Find missing legs, hypotenuse
- Scientific Calculator Free online scientific calculator that reads a full expression: powers, roots, logs, factorials and trig in de
- Scientific Notation Calculator Convert any number to scientific, engineering and E notation, see the coefficient and exponent, and multiply,
- Secant Calculator Get sec(x) for any angle in degrees or radians, see the cosine it comes from, and check the angles where secan
- Second Derivative Calculator Type a function and a point to get f'(x) and f''(x). See both derivative formulas, the value at your point, an
- Sine Calculator Find the sine of any angle in degrees or radians, with the cosecant included, plus key values, worked examples
- Slope Calculator Find the slope between two points with the angle, distance, line equation, percent grade, roof pitch and a che
- Slope Intercept Form Calculator Turn two points into slope intercept form: get m, b and the equation y = m x + b, with worked examples and the
- Slope Percentage Calculator Turn rise and run into a percent grade, then read it as degrees, a 1:N ratio and feet of climb per mile. Handy
- Slugging Percentage Calculator Turn at-bats, singles, doubles, triples and home runs into total bases and slugging percentage, with 2025 MLB
- Specific Heat Calculator Work out the heat energy a material absorbs or releases from its mass, specific heat and temperature change, i
- Spring Constant Calculator Find a spring constant from a force and a stretch. Get k in N/m, N/cm and lbf/in, the energy stored, and the c
- Square Root Calculator Get any square root as a decimal or a simplified radical. Perfect square checks, Newton's method steps and nea
- Square Root Curve Calculator Turn a raw test score into its square root curve grade with 10 x sqrt(raw), see the boost in points, or work b
- Standard Deviation Calculator Enter a list of numbers to get the mean, variance and standard deviation, using either the n or n-1 divisor, p
- Standard Error Calculator Find the standard error of a mean, a share or a difference between means, with a confidence interval and the s
- Standard Form Calculator Convert between Ax + By = C and y = mx + b, and read the slope, x intercept and y intercept straight off the s
- Standard Form to Slope Intercept Form Turn Ax + By = C into y = mx + b with slope, intercept and every step shown. Handles vertical lines, fractions
- Statistics Calculator Paste a data set to get the mean, median, mode, quartiles, IQR, sample and population standard deviation, outl
- Sum of Squares Calculator Add up squared values or squared deviations for any list of numbers, with sample and population variance and s
- T Table (Student's t Distribution) Read a t table in two steps: pick the degrees of freedom row, then the tail column. Look up 90, 95 and 99 perc
- Tangent Calculator Find the tangent of any angle in degrees or radians, with cotangent and grade included, plus worked examples a
- Terminal Velocity Calculator Find the terminal velocity of a falling object from its mass, area and drag coefficient, with air density by a
- Time to Decimal Calculator Turn hours and minutes into decimal hours for payroll. Converts 7:45 to 7.75, applies quarter hour or 0.1 hour
- Triangle Calculator Solve any triangle from three sides, two sides and the included angle, or two angles and one side. Get every s
- Trigonometry Calculator Get sine, cosine, tangent, secant, cosecant and cotangent for any angle in degrees or radians, plus the quadra
- Types of Chemical Reactions Learn the five types of chemical reactions, balance four worked examples atom by atom, and sort any equation w
- Unit Circle Calculator Enter any angle in degrees or radians to get sine, cosine, tangent, the quadrant, the reference angle, the exa
- Unit Vector Calculator Normalize any 2D or 3D vector. Enter (3, 4) and get (0.6000, 0.8000), with the magnitude, direction angles, a
- Variance Calculator Enter a data set and get the mean, sum of squares, sample variance, population variance and standard deviation
- Vector Addition Calculator Add two or three vectors by magnitude and angle and get the resultant magnitude, direction and quadrant, with
- Vector Magnitude Calculator Get the length of a 2D or 3D vector from its x, y and z components, plus the unit vector and the three directi
- Vector Projection Calculator Project vector v onto u: get the scalar projection, the vector projection, the angle and the perpendicular lef
- Velocity Calculator Enter two positions and two times to get average velocity in m/s, km/h, mph, ft/s and knots, with the sign, th
- Water Velocity Calculator Water velocity from flow and pipe size: GPM to fps and m/s, Schedule 40 inside diameters, the 4 to 8 fps targe
- Wavelength Calculator Convert frequency to wavelength and back for light and sound, with the speed for each medium, photon energy in
- Weight Loss Percentage Calculator Enter a start weight and a current weight to see the percent of body weight lost, the pounds left to a percent
- Weighted Average Calculator Enter up to five values with their weights to get the weighted average, the plain average, and the score you s
- Winning Percentage Calculator Work out a win percentage from wins, losses and ties. 10-6-1 is .618 in the NFL while 10-7 is .588. Also gives
- Z Score Calculator Enter a score, the mean and the standard deviation to get the z score, the percentile, and the share of values
- ppm to mg/L Converter Convert ppm to mg/L and back with the density correction that decides the answer. Includes lab report math, EP
Pets
- Aquarium Glass Thickness Calculator Estimate side and bottom glass thickness from water depth and tank length, compare acrylic, and see the safety
- Aquarium Heater Size Calculator Find the right aquarium heater wattage. Enter tank size, target and room temperature, and the calculator retur
- Aquarium Salt Calculator Work out how much aquarium salt to add to a freshwater tank. Pick the dose, enter gallons, and get tablespoons
- Aquarium Tank Weight Calculator Add up the real weight of a fish tank: water at 8.34 lb a gallon, glass, sand and rock. See the total and the
- Aquarium Volume Calculator Convert tank dimensions in inches to gallons, then subtract substrate, rock and the gap above the water line t
- Aquarium Water Change Calculator Find the right aquarium water change. Enter your nitrate reading and tank size, and get the percent to change,
- Benadryl for Dogs Dosage Calculator Benadryl for dogs dosage chart: enter your dog's weight to see diphenhydramine dose in mg, tablets or liquid.
- Bird Age Calculator Calculate your pet bird's age in human years across budgies, cockatiels, conures, macaws, and parrots. Discove
- Cat Age Calculator Enter your cat's birthday to get the exact age in years, months and days, the human-age equivalent, the life s
- Cat BMI Calculator Score your cat on the 9-point body condition scale to see its ideal weight, the pounds of excess fat, and the
- Cat Calorie Calculator How many calories does your cat need each day. Enter weight and life stage for kcal per day, food amount, and
- Cat Feeding Calculator Enter your cat's weight and life stage to get daily calories, cups of dry food, cans of wet food and the neute
- Cat Food Calculator Enter your cat's weight and food to see daily calories, cups of dry food or cans of wet food, cost per month a
- Cat Life Stages Calculator Enter your cat's age to get its life stage, human-age equivalent and what changes in care. Kitten to 1, young
- Cat Litter Calculator Work out how many litter boxes your cats need, how many pounds of litter to buy each month, and what a full ye
- Cat Medication Safety Checker Check how much of a human pain reliever a cat swallowed in mg per kg, and see why acetaminophen and ibuprofen
- Cat Pregnancy Calculator Estimate your cat's kittening due date from the breeding date. See the 60 to 67 day window, ultrasound day, X-
- Cat Quality of Life Calculator Score your cat on the seven HHHHHMM categories, see the total out of 70, and compare it with your last check s
- Cat Years to Human Years Calculator Convert cat years to human years with the standard formula, 15 for the first year, 24 by the second, then abou
- Dog Age Calculator Convert dog years to human years by size: 15 in year one, 24 by year two, then 4 to 7 per year. A 10-year-old
- Dog Ate Raisins: Toxicity Risk Calculator Estimate the raisin dose per kilogram for your dog's weight, see why there is no safe amount, and get the ASPC
- Dog BMI and Body Condition Calculator Enter your dog's weight and body condition score to get its ideal weight, the pounds of excess fat, and why ve
- Dog Boarding Cost Calculator Estimate dog boarding cost by nights, nightly rate, number of dogs and add-ons, with multi-dog discounts, so y
- Dog Calorie Calculator Free dog calorie calculator: enter your dog's weight, age and activity level to see the calories and cups of f
- Dog Crate Size Calculator Free dog crate size calculator: measure your dog's length, height and width and get the crate dimensions and s
- Dog Food Calculator Work out how many cups to feed your dog from its weight, life stage and the bag's calories per cup, plus how l
- Dog Harness Size Guide and Calculator Dog harness size guide: measure chest girth and neck instead of guessing by weight, get a size band, a girth r
- Dog Heat Cycle Calculator Find the next heat cycle and fertile window. Enter the last heat start date and breed size to see stages, ovul
- Dog Life Expectancy Calculator Enter your dog's weight and age to see the typical lifespan range for its size band and how many years are lik
- Dog Medicine Dosage Calculator Estimate a dog medicine dose by weight for Benadryl, Pepcid and Dramamine, with tablets per dose and daily tot
- Dog Pregnancy Calculator Enter the breeding date to estimate your dog's whelping due date, the 58-68 day window and key milestones. A p
- Dog Treat Calculator Work out how many treats your dog can have in a day. Pick a treat, enter weight, and get the max number of tre
- Dog Walking Calories Calculator See how many calories you burn walking your dog. Enter your weight, walk length and pace to get a per-walk and
- Dog Water Intake Calculator Free dog water intake calculator: enter your dog's weight, activity and weather to see how many ounces and cup
- Dog Years to Human Years: Size and Breed Age Calculator Calculate your dog's true physiological age in human years using modern veterinary life-stage milestones and e
- First Time Dog Owner Cost Calculator Budget your first dog: see the 3,221 dollar first year, the 1,200 to 2,000 dollar yearly cost by size, and the
- Fish Tank Size Calculator Calculate fish tank size in gallons and litres from inches: rim capacity, real water after gravel and rock, an
- Fish Tank Stocking Calculator Find out how many fish your tank can hold. Enter the tank size, filtration and fish type to get the safe inche
- Flea and Tick Treatment Cost Calculator Flea and tick treatment cost calculator: pick a product, pet size and number of pets to see the yearly bill, p
- Guinea Pig Age Calculator Convert your pet guinea pig's age into human years using a veterinary life stage chart. See dietary milestones
- Horse Gestation Calculator Enter a breeding date to see the average foaling date at 340 days plus the full 320 to 370 day window, so you
- How Big Will My Puppy Get? Enter your puppy's weight and age to estimate adult weight from AKC growth-chart percentages, with size-class
- How Much Chocolate Is Toxic to Dogs? Enter your dog's weight and the chocolate eaten to estimate the dose per pound against the 9 and 18 mg per lb
- Litter Box Size Calculator Find the smallest litter box your cat should have and how many boxes you need. Enter your cat's body length an
- Most Intelligent Dog Breeds and Working Intelligence Guide Compare canine intelligence rankings across six working tiers. Discover learning speeds, repetition rates, and
- Omega-3 for Dogs Dose fish oil by EPA and DHA content, not capsule size: enter your dog's weight to see a daily EPA + DHA targe
- Pet Age Calculator Convert your dog or cat age to human years. Pick the species, age and size to see the human equivalent and you
- Pet Medication Dosage Calculator Turn a vet's mg/kg dose into milligrams, tablets or milliliters for a dog or cat, and see why human pain relie
- Pet Sitter Rates See what pet sitters charge: national averages of $21.80 per drop-in and $55.45 per overnight day, plus extra-
- Puppy Feeding Calculator Work out how many cups a puppy needs a day from its age, current weight and expected adult size, plus meals pe
- Puppy Weight Calculator Enter the age in months, current weight and expected adult weight to see the weight range for that month, the
- Puppy Weight Chart Estimate how big your puppy will get: enter its age and weight, pick the breed size, and see the projected adu
- Rabbit Cage Size Calculator Enter your rabbit's adult weight to get the minimum cage length, floor area, and exercise pen size experts rec
- Spay or Neuter a Cat: Age, Cost and Recovery When to spay or neuter your cat, what the surgery costs from 50 to 500 dollars, and what the 10 to 14 day reco
Tech
- Amp-Hour Calculator Turn current in amps and run time in hours into battery capacity in amp-hours, then add pack voltage for watt-
- Amps to kVA Calculator Convert amps and volts to kVA for single phase or three phase power. See kW, kVAR and the 125 percent current
- Audio File Size Calculator: WAV, MP3 and Storage Time Calculate audio file size for uncompressed WAV or compressed MP3 from sample rate, bit depth, channels and dur
- Bandwidth Calculator Convert Mbps to MB/s, add up what each person and device needs at once, and see whether your plan has the head
- Battery Charge Time Calculator Enter battery mAh, voltage and charger watts to see how long a full charge takes, with a 10% efficiency loss b
- Battery Life Calculator Turn mAh and current draw into real runtime, then see how much capacity 500 charge cycles take away. Includes
- Bits to Bytes Converter Convert bits to bytes and every size up to terabytes. See kB vs KiB, MB vs MiB, and how long a file takes to d
- CFM Calculator Find CFM from room volume and air changes, duct size and velocity, or a sensible heat load, with cubic meters
- Capacitance Enter any two of charge, voltage, capacitance or stored energy and get the other two. The farad and the parall
- Capacitor Calculator Enter capacitance and voltage to get stored charge in coulombs and energy in joules, plus capacitive reactance
- Current Calculator Current in amps from volts and ohms, watts and volts, or watts and ohms, plus milliamps, microamps and paralle
- Data Transfer Calculator Enter the gigabytes and the route to see a realistic transfer time, the delivered speed, the per file cost and
- Data Usage Calculator Estimate your monthly data usage. Enter hours of video, music, gaming, calls, and browsing per day to see how
- Download Time Calculator See how long a download takes from file size and speed. Handles the megabits to megabytes 8x gap, real-world t
- Downtime Cost Calculator Work out what an hour of downtime costs: lost gross profit, idle labor and overhead per hour, plus restart, sc
- Electric Charge Calculator Convert current and time into charge in coulombs, amp-hours and electrons, plus the charge and energy a capaci
- Electric Potential Calculator Find the electric potential at a distance from a point charge with V = kQ/r. A 1 microcoulomb charge at 1 metr
- Electricity Calculator Divide your bill total by your kWh to get the price each kilowatt hour costs, then price any appliance at that
- Electricity Cost Calculator Turn watts and hours into a real bill. See what any appliance costs per hour, month and year at your price per
- How Many Hours of Video Per GB See how many hours of video fit on any card or drive. At 8 Mbps 1080p uses 3.6 GB per hour, while 4K at 45 Mbp
- How Many Photos Can I Store? Work out how many photos and videos fit on your phone, SD card or cloud plan. Enter storage, photo size and vi
- How Many Songs Fit Calculator How many songs fit calculator: pick your storage size and audio bitrate to see the file size per song, how man
- How Much Data Does Gaming Use Per Hour? Online gaming uses about 100 MB an hour, downloads run 50 to 150 GB, and cloud gaming hits 9 GB an hour. See y
- IP Subnet Calculator Work out the subnet for any IPv4 address and prefix: network, broadcast, mask, wildcard, host range and usable
- Internet Speed Calculator Work out how long a download takes: enter the file size and your connection speed to get minutes and seconds,
- KV to RPM Calculator This KV to RPM calculator turns KV and pack voltage into no-load RPM, loaded RPM, gearbox output speed, ESC sw
- LED Resistor Calculator Size a current limiting resistor for any LED: enter supply volts, forward volts and current to get ohms, the n
- MB to GB Converter Convert megabytes to gigabytes instantly. Enter any amount in MB and see the GB total in both decimal (1,000 M
- Mbps Converter Convert Mbps to MB/s, Gbps and Kbps, then see how long a 1 GB file takes in practice. One division by 8 explai
- Mbps to Gbps Converter Convert Mbps to Gbps by dividing by 1,000. See the same speed in MB/s, how long a file takes at 1 Gbps or 2.5
- Netflix Data Usage Calculator Calculate how much data Netflix uses per hour and per month across SD, HD, and 4K. Compare streaming hours aga
- Ohm's Law What Ohm's law means, where the V = I x R triangle comes from, when the rule holds and fails, and worked examp
- Ohm's Law Calculator Enter any two of voltage, current, resistance or power and get the other two, with the formula shown, the heat
- Parallel Resistance Calculator Parallel resistance calculator: combine up to five resistors into one equivalent value, with the reciprocal fo
- Peak Voltage Calculator Convert peak voltage from RMS or peak to peak for sine, triangle and square waves, with rectified average, for
- Peak to Peak Voltage Calculator Convert peak to peak voltage from RMS or peak for sine, triangle and square waves, with the 2.828 sine factor,
- Phone Charging Time Calculator Free phone charging time calculator: enter your battery size, current charge and charger watts to see how long
- Phone Screen Size Calculator Turn a phone's diagonal and resolution into real width, height, area and pixel density. See how much bigger 6.
- Pixel Ruler Turn screen pixels into inches and centimeters. Calibrate with a bank card, then see how zoom and pixel densit
- Pixels Per Inch Calculator Enter resolution and screen size to get pixels per inch, dot pitch and the PPI your viewing distance needs. Se
- Projector Calculator Enter screen size, throw ratio and room light to get image width, throw distance and the lumens a projector ne
- Resistance Calculator Find resistance three ways: from voltage and current with R = V/I, from series resistors that add, or from a c
- Screen Resolution Calculator Free screen resolution calculator: enter any resolution and screen size to get pixel density (PPI), aspect rat
- Screen Size Calculator Measure a screen's width and height and get the diagonal in inches, area, aspect ratio, PPI and viewing distan
- Screen Size Comparison Calculator Compare two screen sizes by real width, height and area, see how 16:9 and 21:9 differ, and check pixel density
- Series Resistance Calculator Add resistors in series to get the total resistance, then with an optional supply voltage see the current and
- Storage Converter Convert between bytes, KB, MB, GB, TB and PB in both decimal (1000) and binary (1024) units, and see why a 1 T
- Streaming Bitrate Calculator Twitch and YouTube bitrate guide: recommended kbps for 720p to 4K at 30 and 60 fps, upload speed needed, and t
- Streaming Data Usage Calculator Work out how many GB your streaming uses each month: video, music, calls and gaming, checked against your data
- TV Size and Viewing Distance Calculator Enter your screen size and resolution to get the recommended viewing distance in feet, plus the THX and SMPTE
- Upload Time Calculator Find out how long a file will take to upload: enter the file size and your upload speed in Mbps, and get the t
- VA to kVA Calculator Divide volt-amps by 1,000 to get kVA, then read the amps, kW and kvar behind the number at your voltage, phase
- VA to kW Calculator Convert volt-amps to kilowatts with a power factor you choose: kW = VA x PF / 1000. UPS, transformer and circu
- Video File Size Calculator Enter a clip length, video and audio bitrate to get the file size in MB and GB, how many minutes fit on a card
- Voltage Calculator Calculate voltage three ways: V = I x R, V = P / I and the square root of P x R, with household 120 and 240 V
- Voltage Divider Calculator Work out the output of a two resistor voltage divider, with and without a load, plus the current and the power
- Voltage Drop Calculator Find the voltage drop on a copper or aluminum run in single or three phase circuits, and see which wire gauge
- Wh to mAh Calculator Turn watt-hours into milliamp-hours at any voltage. 74 Wh at 3.7 V is 20,000 mAh, the same pack at 5 V is 14,8
- Wire Ampacity Calculator Find wire ampacity for 14 AWG to 4/0 copper or aluminum at 60, 75 or 90 C, then apply NEC 2023 ambient and bun
- Wire Size Calculator Pick copper wire size from load amps and run length: NEC ampacity, voltage drop at 120 and 240 volts, 3 percen
- kVA to VA Calculator Convert kVA to volt-amps and back, see the amps behind any kVA at your voltage, and size a breaker, UPS or tra
- kVA to kW Calculator Convert kVA to kW with the power factor, work back from kW to kVA, and see the amps for single or three phase
- kW to kVA Calculator Divide kilowatts by the power factor to get kVA: 100 kW at 0.8 pf is 125 kVA, plus the amps at 480 volts three
- kW to kWh Calculator Convert kW to kWh with hours of use, plus the monthly and yearly cost at 18.16 cents per kWh. A 2 kW heater fo
- kWh to kW Calculator Convert kilowatt-hours to average kilowatts over any period, and kW back to kWh. Worked examples for bills, EV
- mAh to Hours Calculator Convert a battery's mAh rating and your device's draw into runtime in hours, plus watt-hours for airline and p
- mAh to Wh Calculator Convert milliamp hours to watt hours at any voltage, see why voltage changes the answer, and check power banks
Text
- Case Converter Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and mo
- Numbers to Words Converter Convert numbers to words in one step: dollars and cents, plain words, or check format for amounts up to 999 tr
- Reading Level Calculator Paste any text to get its Flesch-Kincaid grade, reading ease, Gunning Fog and SMOG scores, plus word, sentence
- Text to Speech Time Calculator Estimate how long text to speech or narration takes: enter word count and speaking rate to get minutes and sec
- Word Counter Count words, characters, sentences and paragraphs as you type, with reading time, speaking time and the most f
Travel
- Baggage Weight Calculator Check your checked bag against 11 US airline weight limits in pounds and kilos, and see the typical overweight
- Best Time to Fly Calculator Find the cheapest day and time to fly. Enter your fare, planned day and flexibility to see the best departure
- Carry-On Size Calculator Check your bag against each airline's carry-on limit in inches and linear inches, with wheels and handles coun
- Check-In Time Calculator Check-in time calculator: enter your flight time and how you are getting to the airport to see when to leave,
- Cross Exchange Rate Calculator Turn two dollar quotes into a cross rate, then see what a spread on each leg costs. 100,000 yen becomes 613.33
- Currency Converter Convert an amount with the real rate you get, then see what the bank spread and fixed fee cost in dollars, so
- Drive Time Calculator Turn miles into hours with a realistic average speed for highway and city miles, then add fuel and rest stops
- Driving Time Calculator Free driving time calculator: enter your distance, average speed and rest stops to get total trip time, arriva
- Flight Carbon Calculator Estimate the CO2 a flight produces from its distance and your cabin class, per passenger or for the whole part
- Flight Duration Calculator Estimate how long a flight takes from the great-circle distance and cruise speed. Pick two airports for flight
- Flight Emissions Calculator Estimate the CO2 a flight emits per passenger from distance, cabin class and aircraft size, and see how much n
- Flight Time Calculator Turn a scheduled block time into real time in the air, wheels up, and the local arrival clock after the time z
- Gas Split Calculator Split fuel costs by headcount or by miles ridden, add a wear allowance for the car owner, and see exactly what
- Hotel Cost Calculator Calculate total hotel stay costs with nightly room rates, occupancy taxes, resort fees, parking charges, and i
- Hotel Tip Calculator Work out hotel tips by night and by bag: $2 to $5 for housekeeping, $1 to $2 a bag, plus valet and concierge,
- How Much Cash to Bring on Vacation Work out vacation cash from trip length, travelers and daily spending, then add an emergency reserve and ATM f
- How Much to Budget Per Day in Europe Daily budget ranges for Europe by region and travel style, from $100 a day in Central Europe to $260 in Switze
- How Much to Tip at an All Inclusive Resort Budget tips per person per day at an all inclusive resort, see who gets what, and check which resorts ban tipp
- International Data Plan Calculator Compare a $12 a day roaming pass with a travel eSIM: enter trip days and daily data to see both totals, cost p
- Jet Lag Calculator See how many days jet lag will last for your route, your body clock time on arrival, and the exact light and m
- Luggage Size Calculator Check any bag against airline carry-on and checked limits. Enter length, width and height to see linear inches
- Luggage Weight Calculator Luggage weight calculator: enter each bag's weight to see the total, how many pounds over the airline limit yo
- Packing List Generator Enter trip days, weather and laundry access to get exact counts for tops, bottoms, socks and shoes, plus packe
- Parking Cost Calculator Work out what a parking stay costs with an hourly rate and a daily cap, then see whether a monthly pass beats
- Passport Photo Size Calculator Calculate passport photo dimensions in millimeters, inches, and pixels for the US, UK, Canada, and Europe at 3
- Road Trip Budget Calculator Road trip budget calculator: enter your miles, MPG, gas price, nights and food to see the total cost of your t
- Road Trip Cost Calculator Calculate driving route expenses including gas, highway tolls, hotel stays, food, and maintenance wear. Split
- Travel Budget Calculator Free travel budget calculator: add flights, lodging, food, activities and a buffer to see your trip total, the
- Travel Tip Calculator Work out the tip on a bill abroad: pick a percentage, split it between travelers, convert it to US dollars, an
- Trip Cost Calculator Add flights, baggage, hotels, food, local transit and tickets for any trip, then see the total, the cost per p
- Trip Expense Splitter Track who paid what on a group trip, split shared costs evenly, keep personal spending out, and convert foreig
- Vacation Food Budget Calculator Vacation food budget calculator: see per person and family totals for cooking, mixed or restaurant trips, buil
- Visa and Passport Photo Size Calculator Check visa and passport photo sizes for the US, Schengen, UK, Canada and China. Convert 2x2 in or 35x45 mm to
- What to Pack Calculator Tell it your trip length, destination and whether you can do laundry, and get a packing list with real quantit