Free Car Calculators

Work out the fuel cost of any trip in MPG (US/UK) or L/100km, one-way or round trip, and split it between passengers. Free, no sign-up.

Calculate what it costs to charge an electric car at home or at a public charger, including charging losses, and compare the cost per mile with a petrol car.

Estimate the monthly payment on a car loan from price, down payment, trade-in, APR and term. See total interest and total cost before you sign.

Compare the real cost of leasing versus buying a car with a loan over the same period, including the car's resale value at the end.

Compare two tire sizes (e.g. 205/55R16 vs 225/45R17): diameter, sidewall, circumference, revolutions per mile and speedometer error.

Convert torque and RPM to horsepower and kW, or horsepower to torque at a given RPM. Supports lb-ft and Nm. Shows the 5252 rpm crossover.

Estimate how much a car will be worth after each year with your own first-year and yearly depreciation rates. See a year-by-year table.

Add up depreciation, fuel, insurance, maintenance, tax and financing to find what your car really costs per month and per mile or km.

Find when your next oil change is due by mileage and by time, whichever comes first, based on your manufacturer's interval and how much you drive.

Calculate road speed from engine RPM, gear ratio, final drive and tire size – or the RPM at a given cruising speed. Useful for swaps and tire changes.