Fuel Economy Calculator
Enter the distance and the fuel used. See litres per 100 km, km per litre, US mpg and UK mpg with the formula. Add a fuel price you type for the cost per 100 km.
Frequently asked questions
What is the formula?
L/100 km is litres divided by kilometres, times 100. US mpg uses the 3.785 L US gallon and UK mpg uses the 4.546 L imperial gallon.
Why are US and UK mpg different?
The UK gallon is about 20% larger, so the same car shows a higher mpg in UK figures.
How do I measure fuel used?
Fill the tank, reset the trip meter, drive, then fill again. The fuel added at the second fill is what you used for that distance.