Automotive
Car math for normal drivers: fuel cost per trip, cost per mile, EV charging versus gas, towing and payload limits.
52 free tools in this category. See every tool on Lelifi.
- 20/4/10 Rule CalculatorThe 20/4/10 rule: 20% down, a 4 year loan and total car costs under 10% of incom
- BMW Monthly Payment CalculatorSee the monthly payment on a new BMW 3 Series, X3 or X5 after tax, down payment
- Brake Pad Life CalculatorFree brake pad life calculator: enter your pad thickness, miles driven and drivi
- CC to HP CalculatorEstimate horsepower from engine cc with divisors for utility, car, turbo and rac
- Capitalized Cost CalculatorWork out gross and adjusted capitalized cost on a car lease, then see how the re
- Car Affordability CalculatorSee how much car you can afford with the 20/4/10 rule: 20% down, a 4-year loan a
- Car Depreciation CalculatorSee what your car will be worth after 1 to 10 years, how much value it loses eac
- Car Insurance Cost EstimatorEstimate your annual premium from a base rate, then see what age, record, covera
- Car Lease vs Buy CalculatorCompare leasing and buying the same car: monthly payment, total cost after resal
- Car Payment CalculatorEstimate a monthly car payment from price, down payment, trade-in, sales tax, fe
- Compression Height CalculatorEnter block deck height, crank stroke and rod length to get the piston compressi
- Cost Per Mile to Drive CalculatorWork out what your car costs per mile: fuel, insurance, maintenance, tires, regi
- Cost To Drive CalculatorWork out what a single trip costs in fuel, wear and tolls. Enter the distance, y
- EV Charging Cost CalculatorSee what it costs to charge an EV at home and on public fast chargers. Enter bat
- EV vs Gas Cost CalculatorCompare the yearly energy cost of an EV and a gas car. Enter your miles, gas pri
- Electric Vehicle Charging Cost CalculatorCalculate your electric vehicle charging cost per full charge, per 100 miles, an
- Electric Vehicle Fuel Savings CalculatorCompare an EV with a gas car by cost per mile, including charging losses, then s
- Engine Displacement CalculatorWork out engine displacement from bore, stroke and cylinder count. Get cubic inc
- Engine Horsepower CalculatorCalculate engine horsepower from torque and rpm or from displacement and BMEP, w
- Engine Hours to Miles ConverterConvert engine hours to equivalent miles for trucks and heavy equipment. Split i
- Engine Torque CalculatorConvert crank torque and rpm into horsepower, then run it through the gears to s
- Fuel Cost CalculatorEnter miles per year, MPG, gas price and tank size to see your yearly and monthl
- Fuel Cost Per Mile CalculatorWork out your fuel cost per mile from gas price and MPG. See cents per mile, tri
- Fuel Economy ConverterConvert MPG, L/100km, km/L and UK mpg in one place, and see why the scales run b
- Fuel Mileage CalculatorCalculate fuel mileage from miles driven and gallons used. See MPG, L/100km, cos
- Gas Cost CalculatorEnter trip miles, your car MPG and the local gas price to get total fuel cost, g
- Gas Mileage CalculatorWork out real MPG from miles driven and gallons pumped. See gallons per 100 mile
- Horsepower CalculatorTurn torque and rpm into horsepower with the 5,252 formula, subtract drivetrain
- How Much Does a Brake Job Cost?See what brake pads, pads and rotors, or a full brake job cost per axle in 2026,
- How Much Does a New Set of Tires CostFour new tires cost $730 to $1,350 installed in 2026. See tire prices by tier, m
- How Much Does an Oil Change CostA conventional oil change runs about $45 and full synthetic $75 to $110. Compare
- Kilometers per Liter Fuel Economy CalculatorConvert km per liter to L/100km and US MPG, see why the two metric units run in
- Lease Mileage CalculatorCheck lease mileage against the annual allowance, project the turn-in odometer a
- Maintenance Cost CalculatorAdd up oil changes, tires, brakes, scheduled service and repairs by the mile, th
- Mileage Reimbursement Calculator and Tax Rules GuideCalculate business mileage reimbursements using official IRS standard mileage ra
- Oil Change Interval CalculatorSee when your next oil change is due by miles and months, with intervals cut for
- Out the Door Price CalculatorWork out the out the door price of a car: negotiated price minus trade in, plus
- Parking Distance CalculatorParking distance calculator: enter lot size, stall dimensions and aisle width to
- Power to Weight Ratio CalculatorCalculate the power to weight ratio from any power and weight units and read it
- Tire Diameter CalculatorFree tire diameter calculator: enter a size like 225/45R17 to get sidewall heigh
- Tire Pressure CalculatorFree tire pressure calculator: convert PSI, kPa and bar, and adjust your door-st
- Tire Size CalculatorDecode a size like 225/45R17 into sidewall height, overall diameter, circumferen
- Tire Size Comparison CalculatorCompare any two tire sizes: sidewall, diameter, circumference and the exact spee
- Toll CalculatorWork out what a toll road costs per mile and per year: pick your road, enter you
- Torque CalculatorConvert torque between lb-ft, lb-in and Nm, or find the torque behind any hp and
- Towing Capacity CalculatorWork out the real trailer weight your truck can handle from GCWR, GVWR, payload
- Trailer Tongue Weight CalculatorFree trailer tongue weight calculator: enter your loaded trailer weight and see
- Trailer Weight CalculatorAdd your trailer, cargo and tongue weight to see if your tow vehicle can safely
- Uber vs Drive CalculatorCompare a ride fare with tip against the true cost of driving, using the 2026 IR
- Used Car Value CalculatorEstimate what your used car is worth: apply a depreciation curve to the original
- Vehicle Registration Fee CalculatorEstimate your annual car registration renewal by state, whether your state price
- Wheel Offset CalculatorConvert wheel offset in millimeters to backspacing in inches, and see how a wide
Car costs hide in plain sight. Gas is the obvious one, but insurance, tires, maintenance and depreciation add up faster, and towing limits are the thing people discover too late. These calculators put a number on what your car costs to run and what it can safely pull.
What a mile costs
Fuel cost per mile is one division: price per gallon divided by MPG. At $3.50 a gallon and 30 MPG that is 11.7 cents a mile, so a 250-mile trip burns $29.18 of gas. The full cost per mile is larger, because it includes everything else. A paid-off sedan driven 12,000 miles a year at $3.50 gas, with insurance, maintenance, tires, registration and depreciation, comes to $7,150 a year, or about 60 cents a mile. That is the figure to compare when you weigh a new car against the one you own.
- Tire pressure: use the door-jamb sticker, not the maximum printed on the sidewall, and measure when the tires are cold.
- Tire size: a code like 225/45R17 breaks down into sidewall height, overall diameter and speedometer error.
- Towing: a trailer should carry 10% to 15% of its loaded weight on the tongue, so a 5,200 lb trailer needs about 624 lb of tongue weight.
- Payload: passengers, cargo and tongue weight all count against the truck's payload, which is often the limit you hit first.
Check the payload sticker before you shop for a trailer, not after.