3 tools
Free Automotive Calculators
Tire sizing and running-cost maths for your vehicle.
Automotive
Tire Size Calculator
Enter a tire size like 275/40R20 to get overall diameter, sidewall height, section width, and revolutions per mile — plus compare two sizes for diameter change and speedometer error. Free, no signup.
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Automotive
Gas Cost Calculator
Enter your distance, fuel efficiency, and gas price to see the fuel cost of a trip — round trip, split between passengers, in miles or kilometres — plus your commute's monthly and annual gas spend. Free, no signup.
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Automotive
Car Depreciation Calculator
See what your car will be worth each year — the steep first-year drop, the flatter years after, and the total value lost to depreciation. Free, no signup.
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