๐ Automotive
Gas Mileage Calculator
Miles per gallon and litres per 100 kilometres move in opposite directions: higher mpg is better while lower L/100km is better. The US gallon is smaller than the imperial gallon, which is why the same car is rated differently on each side of the Atlantic.
How it works
Distance driven
Fuel used
Fuel price unit
US miles per gallon
Imperial miles per gallon
Litres per 100 km
Kilometres per litre
Economy band
Frequently asked questions
How do I use the Gas Mileage Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.