Automotive Calculators
Free, practical tools for car owners and enthusiasts — convert torque to horsepower, decode a tire size, project a car's depreciation, measure real MPG, estimate fuel cost, and size up an auto-loan payment.
Horsepower Calculator
Convert between engine torque and horsepower with HP = torque × RPM ÷ 5252 — go either way, and see why the two curves always cross at 5252 RPM
Tire Size Calculator
Decode a metric tire size into sidewall height, overall diameter, circumference, and revs per mile — and compare two sizes to find the speedometer error of a swap
Car Depreciation Calculator
Estimate what a car will be worth in a few years from its price and an annual depreciation rate, with the total value lost and a year-by-year schedule
MPG Calculator
Turn miles driven and gallons used into real fuel economy — miles per gallon plus the metric equivalents in litres per 100 km and kilometres per litre
Fuel Cost Calculator
Estimate the fuel a drive needs and what it costs from distance, MPG, and pump price — and scale it up to an annual fuel bill from your yearly mileage
Car Loan Calculator
Estimate your monthly auto-loan payment from price, down payment, trade-in, rate, term, and tax, with the amount financed, total interest, and total cost