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6 calculators
  • Pressure
  • Speed
  • Fuel
  • Tires

Free car calculators for tire size, fuel consumption, bar to psi, and mph to km/h. Check wheel fitment and convert pressure, speed, and fuel use.

Pressure Bar to PSI Convert bar to psi for tire pressure and boost. Pressure PSI to bar Convert psi to bar for tire pressure and boost. Speed MPH to km/h Convert miles per hour to kilometres per hour. Speed km/h to MPH Convert kilometres per hour to miles per hour. Fuel Fuel consumption Convert L/100 km, mpg, and km/L, or work out a trip from distance and fuel used. Tires Tire size Enter your tire size, compare a second one, and see which other tires and wheels stay close enough to fit.

Common questions

How do I convert bar to psi?

Multiply bar by 14.5038. 2.2 bar, a common passenger-car tire pressure, is 31.91 psi. The bar to psi and psi to bar tools do this both ways.

What tire size difference is safe?

A different tire is usually acceptable when overall diameter stays within 3% of the original. That keeps the speedometer, gearing, and clearance close. Load index and speed rating still need to match or exceed the original.

How do I convert mpg to L/100 km?

US mpg converts as 235.21 divided by the mpg figure. UK mpg uses 282.48. The fuel calculator also accepts km/L and can turn a distance plus fuel used into all four units.

Does a larger tire change the speedometer?

Yes. A taller tire travels farther per revolution, so actual speed is higher than the speedometer shows. The tire size calculator shows that difference at an indicated 100 km/h.