Everyday

Everyday utilities that do not fit anywhere else: quick reference calculators for ordinary life.

202 free tools in this category. See every tool on Lelifi.

• 1 Hour Cycling Calories CalculatorOne hour on the bike spans 343 to 1,440 calories for a 180 pound rider. See the
• 1 Hour Lunch Break CalculatorClock in at 8:30 and out at 5:00 with a 1 hour unpaid lunch: 7.5 paid hours and
• 1 Million in Numbers1 million in numbers is 1,000,000, a 1 with six zeros. See the comma grouping, s
• 1 Weeks Ago From TodaySee the exact date 1 week ago from today, the weekday it fell on, the 168 hours
• 1 in 60 Rule CalculatorWork the 1 in 60 rule: enter distance flown, distance to go, and how far off tra
• 10 Day Payoff CalculatorEnter your balance, APR and payoff date to get per diem interest, the 10 day pay
• 10 Hour Shift Schedule CalculatorPlan 10-hour shifts: weekly hours for 4 on 3 off, 5 on 2 off and 2-2-3 rotations
• 10 Minutes From Now10 minutes from now is your clock plus ten minutes. See the carry rule, the 600
• 10 Months Ago From TodaySee the exact date 10 months ago from today, the weekday it fell on, the 304 day
• 10 to 1 Arm Workout CalculatorBuild a 10 to 1 arm ladder and get the exact rep count, work time, rest time, to
• 10207 2: Log Base 2 CalculatorWhat 10207 2 means in log base 2 terms: log2(10207) = 13.3173 by change of base,
• 1099 Hourly Rate CalculatorTurn a 1099 contract into an hourly rate. Enter the contract total or a salary t
• 11 Months Ago From TodaySee the exact date 11 months ago from today, the weekday it fell on, the 335 day
• 11 Weeks Ago From TodaySee the exact date 11 weeks ago from today, the weekday it landed on, the 77 day
• 12 Hour Shift Pay CalculatorWork out what a 12-hour shift pays: weekly hours, overtime past 40, hospital 8 a
• 12 Months Ago From TodaySee the exact date 12 months ago from today, the weekday it fell on, the 365 day
• 12 Weeks Ago From TodaySee the exact date 12 weeks ago from today, the weekday it fell on, the 84 day p
• 120 Minutes Ago120 minutes ago is two hours before the clock reading, with the minute digits un
• 13 Months Ago From TodayPin down the exact date 13 months ago from today, its weekday, the 396 day inter
• 13 Weeks Ago From TodaySee the exact date 13 weeks ago from today, the weekday it fell on, the 91 day s
• 15 Minutes From Now15 minutes from now is your clock plus a quarter hour. See the carry rule, the 9
• 15 Months Ago From TodayPin down the exact date 15 months ago from today, its weekday, the 457 day inter
• 15 Weeks Ago From TodaySee the exact date 15 weeks ago from today, the weekday it fell on, the full 105
• 150 Minutes Ago150 minutes ago is 2 hours 30 minutes before the clock, a 9,000 second gap. See
• 150 Minutes From Now150 minutes from now is your clock plus 2 hours 30 minutes. See the carry rule,
• 16 Months Ago From TodaySee the exact date 16 months ago from today, the weekday, the 488 day interval i
• 16 Weeks Ago From TodaySee the exact date 16 weeks ago from today, the weekday it fell on, the 112 day
• 17 Months Ago From TodaySee the exact date 17 months ago from today, the weekday it fell on, the 518 day
• 180 Minutes Ago180 minutes ago is three hours before the reading, with the minute digits unchan
• Accuracy CalculatorCalculate measurement accuracy, percent error, signed error, absolute difference
• Actual Cash Value CalculatorCalculate actual cash value from replacement cost, age and useful life, with str
• Add Times CalculatorAdd multiple time durations across days, hours, minutes, and seconds. Calculate
• Additive Inverse CalculatorFind the additive inverse of any integer, decimal, or fraction, check that the p
• Air Dry vs Dryer Cost CalculatorCompare air drying clothes with running the dryer. Enter your dryer watts, run t
• Amp to Volt CalculatorTurn amps into volts through watts or resistance. Enter current plus power or oh
• Arccos CalculatorFind the angle behind a cosine value from -1 to 1 in degrees and radians, or use
• Audiobook Speed CalculatorEnter an audiobook's length and your playback speed to see the new runtime, minu
• Baking Soda Deodorizer CalculatorBaking soda deodorizer guide and calculator: how much to use for a fridge, carpe
• Big Number CalculatorAdd, subtract, multiply and divide numbers with dozens of digits and keep every
• Birthday CalculatorEnter a birth date to get your exact age, the weekday you were born, your next b
• Bond Order CalculatorCalculate bond order from bonding and antibonding electron counts, get fractiona
• Bow FPS CalculatorEstimate real arrow speed from an IBO or ATA rating. Adjust for draw length, dra
• Bra Size CalculatorEnter underbust and bust measurements to get your US band and cup, sister sizes,
• Buoyancy CalculatorFind the buoyant force in fresh water, sea water or any fluid, plus the float or
• CBM CalculatorTurn carton dimensions into total CBM, cubic feet and liters, then see the share
• Cash Back CalculatorCash back calculator: add up rewards by spending category, subtract the annual f
• Cash on Cash Return CalculatorWork out cash on cash return from your down payment, closing costs and rehab bud
• Ceiling Fan Size CalculatorCeiling fan size calculator: enter your room size and ceiling height to get the
• Chebyshev's Theorem CalculatorEnter a mean, a standard deviation and k to get the guaranteed share inside that
• Cofactor Determinant CalculatorExpand a 2x2, 3x3 or 4x4 determinant by cofactors and see every minor, sign and
• Constant of Proportionality CalculatorEnter one pair of x and y values to get the constant of proportionality k, the e
• Consumer Surplus CalculatorEnter the top price buyers would pay, the market price and the quantity to get t
• Coulomb's Law CalculatorUse the Coulomb's law calculator to get the force between two charges in newtons
• Coulombs to MicrocoulombsConvert coulombs to microcoulombs in one step: enter charge in C, mC, µC or nC a
• Coulombs to MillicoulombsConvert coulombs to millicoulombs and back, with the mAh bridge: battery charge,
• Coulombs to NanocoulombsConvert coulombs to nanocoulombs with the exact factor of 10^9, plus worked exam
• Coulombs to PicocoulombsConvert coulombs to picocoulombs with the exact 10^12 factor, worked examples, a
• Crossed Cylinder CalculatorCombine two cylinder lenses at any axes. The calculator returns the resultant cy
• Days Ago CalculatorFind the date 1,000, 90 or 30 days ago with its weekday, or count days between t
• Deadweight Loss CalculatorEnter the price and quantity before and after a tax to get the deadweight loss t
• Degrees to RadiansConvert degrees to radians in one step: type an angle and get radians, the multi
• Dice RollerRoll d4, d6, d8, d10, d12, d20 or d100 dice online. Set the count, add a modifie
• Dilution CalculatorSolve C1V1 = C2V2 for stock volume, batch size or strength, turn a 1:N label int
• Dish Soap per Gallon CalculatorCalculate how much dish soap to add per gallon for plant spray, window washing,
• Dish Soap to Water Ratio CalculatorFree dish soap to water ratio calculator: get the exact soap and water amounts f
• Dishwasher Detergent CalculatorWork out how much dishwasher detergent each load needs from your water hardness,
• Distance CalculatorGet the straight-line distance between two coordinates in miles, kilometers and
• Dock Water Allowance CalculatorCalculate Dock Water Allowance (DWA), FWA, and permissible dock draft for vessel
• Drip Rate CalculatorTurn IV volume, drop factor and minutes into drops per minute and mL per hour, o
• Dryer Cost CalculatorSee what a load of laundry costs to dry. Enter your dryer's watts, the cycle tim
• ERA CalculatorEnter earned runs and innings pitched to get ERA to two decimals, plus the 7-inn
• Efficiency CalculatorTurn useful output and energy input into an efficiency percentage, then see what
• Employee Cost CalculatorEnter an hourly wage, hours and benefit costs to get the full annual cost of one
• Endpoint CalculatorGive the midpoint and one endpoint to get the other end in 2D or 3D, plus the se
• Enthalpy CalculatorFind the enthalpy change for heating, cooling, melting, boiling or condensing: e
• Entropy CalculatorFind the entropy change for heating, cooling, melting, boiling or gas expansion.
• Equilibrium Constant CalculatorCompute Kc from equilibrium concentrations, convert Kp with (RT)^delta n, solve
• Expected Value CalculatorEnter each outcome's chance and net value to get the expected value per try, the
• Feed Per Tooth CalculatorTurn spindle RPM, flute count and table feed into feed per tooth in inches and m
• Feed Rate CalculatorCalculate milling feed rate in IPM and mm/min from RPM, chip load and flute coun
• Feet Per Second CalculatorConvert feet per second to mph, km/h, m/s, and knots with exact NIST factors, pl
• Finance CalculatorFree finance calculator: enter take-home pay and monthly bills to see money left
• Flow Rate CalculatorConvert any flow into GPM, L/min, L/s, m3/h and CFM from a volume and a fill tim
• Formal Charge CalculatorFind the formal charge on any atom from its valence electrons, lone pairs and bo
• Furnace Cost CalculatorEstimate what a furnace costs to buy, install and run. Compare natural gas, prop
• GI Bill Monthly Housing Allowance CalculatorEstimate Post-9/11 GI Bill MHA from your campus ZIP BAH rate, benefit tier and r
• Garden Yield CalculatorEstimate how many pounds of vegetables your garden will produce. Enter the crop
• Gold Cost per Pound CalculatorWork out gold cost per pound from any spot price, with troy ounce conversion, ka
• Graduation Gift CalculatorWondering how much cash to put in a graduation card? Get an amount by relationsh
• Grass Cutting Estimate CalculatorEstimate lawn mowing and grass cutting costs. Price a yard in square feet or acr
• Grocery Delivery Tip CalculatorSet a fair tip for grocery delivery: 15 to 20 percent of the order, extra for he
• Grocery Split CalculatorSplit a grocery receipt between two people: shared items down the middle, person
• HCF Cost CalculatorConvert HCF to gallons and dollars. See how 12 HCF prices out at $359 with tiere
• Hair Stylist Tip CalculatorWork out a hair stylist tip in seconds: 15% to 20% on a $65 cut is $9.75 to $13.
• Heron's Formula CalculatorFind a triangle's area from three sides with Area = sqrt(s(s-a)(s-b)(s-c)), s =
• House Price Change CalculatorWork out how much a home gained or lost since you bought it, the annualized retu
• How Much Fabric Softener Per LoadUse 60 ml (4 tbsp) of conventional softener for a medium load, 30 ml for small,
• How Much Floor Cleaner Per GallonTurn any floor cleaner label ratio into ounces, cups and tablespoons per gallon,
• How Much to Give for a WeddingMost guests give $150, siblings and best friends give $250 or more, and coworker
• How to Remove Stains: The Guide By Stain TypeStain removal by type: cold water for protein stains like blood, the 30 minute s
• Hydroseeding Cost CalculatorPrice hydroseeding by the square foot with seed, mulch and prep adders, then see
• Import Cost CalculatorTurn an invoice value into landed cost per unit. Add freight, insurance, duty, t
• Impulse CalculatorFind impulse from force and contact time, or work backwards to the average force
• Incremental Cost CalculatorCompare total cost at two activity levels to get incremental cost per unit, incr
• Index of Refraction CalculatorEnter the speed of light in a material and get its index of refraction, the bend
• Inventory Cost CalculatorAdd up what your stock costs to own: inventory value, annual carrying and orderi
• Ironing Time CalculatorEstimate how long ironing will take, piece by piece. Enter your laundry pile and
• Joule CalculatorConvert joules to calories, BTU, kWh and electronvolts in one step, with everyda
• LCD CalculatorFind the least common denominator of two or three fractions, with the prime fact
• Landed Cost CalculatorTurn a supplier quote into a true cost per unit: goods, freight, insurance, duty
• Laundry Cost CalculatorWork out what one load of laundry costs: washer and dryer energy, water and dete
• Law of Cosines CalculatorSolve any triangle with the law of cosines: three sides to the angles, or two si
• Law of Sines CalculatorSolve any triangle from AAS, ASA or SSA values with the law of sines: both SSA a
• Lawn Mowing Cost CalculatorSee what a lawn service charges per visit, per month and per season for your yar
• Least to Greatest CalculatorOrder fractions, decimals and negatives from least to greatest, with decimal con
• Long Division CalculatorDivide two whole numbers and see the quotient, remainder, decimal expansion, rep
• Love CalculatorType two names and get a match score from 0 to 100 in seconds. A free love calcu
• MCG to MGConvert micrograms to milligrams with the exact 1,000 factor, read supplement an
• MPC CalculatorEnter two income levels and two spending levels to get your marginal propensity
• MRT Cost CalculatorWork out Singapore MRT fares from distance, compare card, cash and senior rates,
• Marginal Cost CalculatorWork out the marginal cost of one more unit from two output levels and their tot
• Massage Tip CalculatorWork out a massage tip at 15%, 18% or 20%, see what a gift card or prepaid packa
• Math CalculatorEnter two numbers to get the sum, difference, product, quotient, remainder, aver
• Math CalculatorsA searchable directory of the 20 math calculators on this site: what each tool d
• Max Purchase Price CalculatorFind the highest home price your income, debts, down payment and DTI limit suppo
• Mean, Median, Mode and Range CalculatorCalculate mean, median, mode, range, count and sum from a list of numbers, with
• Menu Cost CalculatorCost a menu item plate by plate, add yield and waste, then set a price from a 28
• Microcoulombs to CoulombsConvert microcoulombs to coulombs by dividing by one million: 480 µC is 0.00048
• Millicoulombs to CoulombsConvert millicoulombs to coulombs by dividing by 1,000, with worked examples, a
• Mirror Cost CalculatorPrice any mirror from a bathroom vanity to a gym wall: glass per square foot, ed
• Moisture Content CalculatorWeigh a sample wet and dry to get moisture content on a wet basis and a dry basi
• Mole CalculatorUse the mole calculator to switch between grams, moles and particle counts, with
• Mortgage Payoff CalculatorEnter your mortgage balance, rate and years left to see the payoff date, the int
• Moving Cost CalculatorEstimate a move by distance, home size, stairs and packing. See the full-service
• Nail Salon Tip CalculatorWork out the tip on a manicure, pedicure and add-ons at 15% to 20%, see the cash
• Nanocoulombs to CoulombsConvert nanocoulombs to coulombs with the exact 10^-9 factor. Worked examples, a
• Net Carbs CalculatorSubtract fiber and sugar alcohols from total carbs two ways, with an erythritol
• Opportunity Cost CalculatorSee what a purchase costs in the long run: enter the amount, a yearly return and
• P-Hat CalculatorTurn successes and trials into p-hat, get the standard error and a 90, 95 or 99
• Pace CalculatorTurn a distance and a finish time into pace per mile, per kilometer and per 100
• Part Cost CalculatorFind the true cost of a manufactured part: material with scrap, machine time, se
• Picocoulombs to CoulombsConvert picocoulombs to coulombs with the exact 10^12 factor, worked examples fo
• Pizza Delivery Tip CalculatorWork out a fair pizza delivery tip from the food subtotal, then adjust for weath
• Point Estimate CalculatorTurn a sample into the point estimate of a population mean or proportion, with s
• Polar Coordinates CalculatorConvert any point between polar and rectangular coordinates in degrees or radian
• Polymeric Sand CalculatorEnter paver size, joint width and depth to size polymeric sand in pounds and 50
• Pound to Stone ConverterConvert pounds to stone with the leftover pounds and ounces, the decimal stone v
• Price CalculatorEnter a price, quantity, discount, sales tax and shipping to see the order total
• Price Per 100g CalculatorEnter a price and a package weight to see the cost per 100 grams, per kilo and p
• Price Per Ounce CalculatorCompare two packages by price per ounce: enter price and size in fl oz, oz, lb,
• Price Per Pound CalculatorEnter a price and a weight in pounds, ounces, grams or kilos to get the cost per
• Proportion CalculatorSolve a proportion a:b = c:d for the missing term, split a total by a ratio, and
• Prorated Utility Split CalculatorSplit a utility bill by the days you lived there. A $180 bill over 30 days is $6
• Quilting Cost CalculatorAdd up quilt fabric, batting, thread, longarm machine quilting, and your hours t
• Radians to DegreesConvert radians to degrees in one step: type a value and get degrees, the degree
• Random Number GeneratorGenerate random numbers in any range or pick winners from a list, with the odds
• Rational Zeros CalculatorEnter a polynomial to get every possible rational zero, tested one by one, with
• Relative Humidity CalculatorEnter an air temperature with a dew point or a relative humidity to get the othe
• Relative Risk CalculatorTurn four counts into a relative risk, risk difference, odds ratio and 95 percen
• Rent Split CalculatorSplit rent between roommates by headcount or by room size, add utilities, and se
• Rideshare Tip CalculatorWork out the tip on any Uber or Lyft fare: choose 10% to 25%, add a flat amount
• Roof Trusses Cost CalculatorCalculate roof truss counts, package material pricing, delivery, and crane setti
• Round to the Nearest Cent CalculatorRound any dollar amount to the nearest cent, or force it up or down to the penny
• SANS 10198-2 Cable Selection CheckerWhat SANS 10198-2 covers, the selection criteria it sets for power cables up to
• Salvage Value CalculatorSee what a totaled car is worth as salvage, the check if you keep the wreck, and
• Sample Size CalculatorCalculate the sample size you need for a survey or study: proportion and mean fo
• Secret Santa Budget CalculatorSet a per-gift budget and a headcount to see the total gift pool, the real cost
• Sig Fig CalculatorCount the significant figures in any number and round it to a chosen count, with
• Sonotube CalculatorFind how much concrete a Sonotube form takes: volume per tube in cubic feet and
• Specific Gravity CalculatorEnter a weight and a volume to get specific gravity, density, API gravity and Ba
• Square Yards CalculatorTurn length and width into square yards, square feet and square meters, add a wa
• Stone CalculatorEnter a slab, paver or boulder's dimensions and stone type to get volume, weight
• Stress Concentration Factor CalculatorFind the stress concentration factor Kt for a central hole or a semicircular edg
• Taper CalculatorTurn two diameters and a length into taper per inch, taper per foot, the half an
• Taxi Tip CalculatorEnter a metered fare to see the right taxi tip, the cash total after rounding up
• Teacher Gift CalculatorSee what to spend on a teacher gift. Split a class gift across the families taki
• Test CalculatorTurn test scores into percentages and letter grades, then combine three tests in
• Theoretical Yield CalculatorFind the limiting reagent and theoretical yield in grams from two reactant masse
• Timer CalculatorPlan repeated work and break intervals from a start time: work minutes, break mi
• Tip CalculatorFree restaurant tip calculator: pick 15%, 18%, 20%, or 25%, add tax if you like,
• Total Installment Price CalculatorAdd the down payment to every scheduled payment and see the real total installme
• Transformer CalculatorEnter a kVA rating and the primary and secondary voltages to get full-load amps
• True Cost of Ownership CalculatorCalculate the true cost of ownership across 5 and 10 years, including purchase p
• Turf Cost CalculatorPrice sod or artificial turf by square foot: material, labor, base prep, removal
• Unit Price CalculatorCompare two packages by unit price. A 12 oz jar at $3.49 is $0.2908 per ounce, a
• Vertex Form CalculatorConvert y = ax^2 + bx + c into vertex form y = a(x - h)^2 + k: get the vertex, t
• Vinegar Cleaning Dilution CalculatorDilute 5% or 30% vinegar to the strength you want. Get the vinegar and water for
• WHP to HP CalculatorTurn wheel horsepower into crank horsepower with FWD, RWD and AWD drivetrain los
• Water Bill CalculatorEstimate a monthly water bill from the gallons used, the water and sewer rates p
• Watt Converter and Power CalculatorConvert watts to kilowatts, horsepower and BTU per hour with exact factors: 1 hp
• Watt-Hour CalculatorTurn watts and hours into watt-hours, kilowatt-hours, joules and cost, then chec
• Wave Period CalculatorCount passing crests and get the wave period in seconds, plus frequency, deep wa
• Weeks Between Dates CalculatorCount the whole weeks and leftover days between any two dates, with endpoint rul
• Wet-Bulb CalculatorEnter an air temperature and a relative humidity to get the wet-bulb temperature
• Who Owes What CalculatorEnter what each person paid, see the net balance for everyone, and settle up in
• Whole Life Insurance Monthly Cost CalculatorTurn a rate per $1,000 into a whole life monthly premium, then see example cash
• Will a Sofa Fit Through the Door?Measure your sofa and doorway to see if it fits. Enter the door width and height
• Work CalculatorTurn your hourly rate and hours worked into weekly, monthly and yearly pay, with
• kW to VA CalculatorConvert kilowatts to volt-amperes with the power factor you choose, then read th
• mL to Moles CalculatorConvert milliliters to moles with real densities and molar masses for water, eth
• mmol/L to mg/dL CalculatorConvert blood glucose between mmol/L and mg/dL with the exact factor of 18.016,
• pH CalculatorConvert between pH, pOH, hydrogen ion and hydroxide ion concentration at 25 degr

Some questions are too small for a category of their own but still worth an exact answer. How many days until a deadline, how much of an ingredient you need, whether a price is a good deal. The tools collected here are the quick reference calculators that answer an ordinary question in a few seconds, with no sign-up and nothing stored.

Everyday numbers worth knowing

A lot of daily math comes down to a handful of conversions and comparisons you can reuse. Knowing that a year is 365 days, that 90 days is 12 weeks and 6 days rather than a clean 13 weeks, or that a 20% tip on a $68 bill is $13.60 helps you check a number in your head before you trust a screen. Small reference figures like these show up at the store, on a form and at the dinner table.

• Time: a year is about 8,760 hours and 525,600 minutes, which is useful when a contract quotes a rate by the hour.
• Money: a $3 increase on an $11 subscription is 27%, but the same $3 on a $60 item is only 5%.
• Measures: a cup is 16 tablespoons, a pound is 16 ounces and a gallon is 128 fluid ounces.
• Percentages: to find 15% of a bill, take 10% and add half again, so 15% of $40 is $6.

The point of a quick reference is to get a sensible answer fast and move on. If a figure has legal or financial weight, confirm it at the source rather than relying on a rule of thumb.