MPG Calculator
Work out your car's fuel economy in miles per gallon from the distance driven and fuel used.
Fuel economy30.00mpg
Gallons per 100 miles3.33gal
Litres per 100 km (L/100 km)7.84L/100km
Miles per gallon = distance driven ÷ fuel used. Drive 300 miles on 10 gallons and you get 300 ÷ 10 = 30 mpg. The reciprocal — gallons per 100 miles — is handy for comparing thirsty vehicles, and 235.215 ÷ mpg converts US mpg into the metric L/100 km used elsewhere.
Questions
How do I calculate miles per gallon?
Divide the miles you drove by the gallons of fuel you used. If you covered 300 miles on 10 gallons, that is 300 ÷ 10 = 30 mpg.
How do I convert MPG to L/100 km?
Divide 235.215 by the US mpg figure. 30 mpg is 235.215 ÷ 30 ≈ 7.84 litres per 100 kilometres.