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About this tool
Convert fuel economy between US mpg, imperial mpg, km/l, miles per litre and litres per 100 km using exact unit definitions.
This converter translates fuel economy between US mpg, imperial mpg, km/l, miles per litre and litres per 100 km using exact unit definitions — 1 mile = 1.609344 km, 1 US gallon = 3.785411784 litres, 1 imperial gallon = 4.54609 litres. It handles the fact that km/l and mpg are distance-per-fuel (higher is better) while l/100 km is fuel-per-distance (lower is better), so the two families are reciprocals. Useful when a review quotes mpg, a brochure quotes km/l and a European spec sheet quotes l/100 km.
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Uses the legal gallon and mile values, not rounded shortcuts.
Keeps US and imperial mpg separate so you never compare the wrong one.
Adds fuel cost per km and per 100 km at your pump price.
Multiply US mpg by 0.425144 to get km/l, or divide by 2.352146. So 30 US mpg is 12.75 km/l. For imperial mpg the multiplier is 0.354006, because a UK gallon holds 4.54609 litres against the US gallon's 3.785412.
No. An imperial gallon is about 20.1% larger than a US gallon, so the same car scores about 20% higher in UK mpg. 30 US mpg is 36.0 UK mpg — quoting one for the other overstates or understates efficiency by a fifth.
Divide 100 by the km/l figure, since the two units are reciprocals. 20 km/l is 100 ÷ 20 = 5.0 l/100 km, and 12.75 km/l is 7.84 l/100 km.
Litres per 100 km scales linearly with fuel spend, so a 1 l/100 km improvement is worth the same money whether the car is thirsty or frugal. With mpg or km/l the same numerical gain matters far more at the low end — going from 10 to 12 km/l saves much more fuel than going from 20 to 22.
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