Fuel Economy Converter & Calculator
Use actual driving distance and the fuel used to calculate fuel efficiency in four common representations. US gallons and UK imperial gallons are not the same size, so we show both MPG measures separately.
Enter your figures
Use your own values for a meaningful estimate.
How this calculation works
km/L = distance in km ÷ liters. L/100 km = 100 × liters ÷ distance in km. US MPG = miles ÷ US gallons; UK MPG = miles ÷ UK gallons.
Worked example
Traveling 500 km on 35 liters equals 14.29 km/L, 7 L/100 km, approximately 33.60 US MPG and 40.35 UK MPG.
Use the selected country only for currency and unit presentation. This site does not perform exchange-rate conversion or infer regional prices.
Frequently asked questions
Why are US and UK MPG different?
A UK imperial gallon is about 4.54609 liters, while a US gallon is about 3.78541 liters.
Can I use a single short trip?
You can, but several full-tank measurements generally reduce random error.