MPG to L/100km calculator
Consumption and economy run in opposite directions, so the conversion is a division rather than a multiplication.
L/100km
US miles per gallon
31.362
- Imperial miles per gallon
- 37.664
- Kilometres per litre
- 13.3333
- Miles per litre
- 8.2849
- Litres per kilometre
- 0.075 00
- US gallons per 100 miles
- 3.1886
Show the working
- Fuel consumption = 7.5
- US miles per gallon = 235.214582916667 / 7.5 = 31.3619
- Imperial miles per gallon = 282.480936331822 / 7.5 = 37.6641
- Kilometres per litre = 100 / 7.5 = 13.3333
- Miles per litre = 13.3333 / 1.609344 = 8.284 95
- Litres per kilometre = 7.5 / 100 = 0.075
- US gallons per 100 miles = 7.5 * 1.609344 / 3.785411784 = 3.188 58
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- US mpg = 235.214 582 916 667 / (L/100 km)
- imperial mpg = 282.480 936 331 822 / (L/100 km)
- both constants follow exactly from the definitions of the mile and the gallon
The imperial gallon is 4.546 09 L and the US gallon 3.785 411 784 L, which is why the two mpg figures differ by 20%.
Consumption per distance is the better measure for comparing savings: going from 20 to 25 mpg saves far more fuel than going from 40 to 50.