Auto Calculators

Free car calculators: compare tire sizes and work out your fuel economy.

7 calculators

• Tire Size Calculator

  Compare two tire sizes and see the diameter difference and speedometer error.

• Gas Mileage Calculator

  Find your car's real MPG from miles driven and gallons used, in km/L too.

• Speed, Distance and Time Calculator

  Find speed, distance, or travel time from the other two, in miles or kilometers.

• Car Depreciation Calculator

  Estimate how much value your car has lost and what it is worth after a few years.

• Horsepower Calculator

  Find horsepower from torque and rpm, or convert between hp, kW, and PS.

• 0 to 60 Calculator

  Estimate your car’s 0 to 60 mph time from its weight and horsepower.

• EV Charging Cost Calculator

  Find the cost to charge your electric car at home or at a public charger.