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Fuel Economy (MPG) Calculator

Work out your car's real-world fuel economy from a tank of fuel.

  • Free
  • No sign-up
  • Nothing is sent or stored
Units
km
L
per L

Result

Fuel economy
7.31 L/100 km
Litres per 100 km
7.31
km per litre
13.68
MPG (US)
32.2
MPG (UK)
38.7
Fuel cost for this trip
$62.70
Cost per km
$0.121
Fill the tank completely, reset the trip meter, drive, then fill up again — the litres or gallons you add are the fuel used.

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved.

How to use the Fuel Economy (MPG) Calculator

  1. Choose your units.
  2. Enter the distance driven and fuel used since your last full tank.
  3. Add the fuel price to see cost per mile or km.

What does this tool do?

The most accurate way to measure fuel economy is the full-tank method: fill up, reset the trip meter, drive normally, then fill up again. The fuel you add is what you used over that distance.

Results are shown in every common unit, so you can compare with official figures from any country.

Why use it?

  • Every unit at once.
  • Cost per mile or km.
  • US and UK gallons.

Privacy

The calculation happens instantly in your browser. The numbers you enter are not sent to our servers or saved. There's no account to create and nothing to install.

Last reviewed by the M2Toolkit team.

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