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mpg to L/100km Converter

Convert mpg to L/100km and back — L/100km = 235.214 ÷ mpg (US gallons). Free, instant, no sign-up, full working shown.

Convert mpg ⇄ L/100km

7.8405 L/100km
30 mpg (US) = 7.8405 L/100km (US gallons — UK (imperial) mpg needs a different constant, 282.481)

Formula: 235.214 ÷ 30 = 7.8405 L/100km

How the mpg to l/100km conversion works

The converter applies L/100km = 235.214 ÷ mpg, using US gallons. It works both ways because the same constant inverts: mpg = 235.214 ÷ L/100km. Note the inversion — better fuel economy means a higher mpg but a lower L/100km.

Worked example: 30 mpg (US) is 235.214 ÷ 30 = 7.84 L/100km. A car rated at 5 L/100km is 235.214 ÷ 5 = 47.04 mpg (US).

Watch out for UK mpg: the imperial gallon is bigger (4.54609 litres vs 3.78541), so the UK constant is 282.481, not 235.214 — a UK 47 mpg car is about 39 mpg in US gallons. For more everyday tools, see the full list on the homepage.

mpg to l/100km questions

How many L/100km is 30 mpg?
7.84 L/100km — 235.214 ÷ 30. This is US gallons; UK mpg gives a different answer.
How do I convert mpg to L/100km?
Divide 235.214 by the mpg: L/100km = 235.214 ÷ mpg. So 40 mpg is 235.214 ÷ 40 = 5.88 L/100km.
How do I convert L/100km back to mpg?
Divide 235.214 by the L/100km: mpg = 235.214 ÷ L/100km. So 6 L/100km is 235.214 ÷ 6 = 39.20 mpg (US).
Why is UK mpg different from US mpg?
The imperial gallon (4.54609 litres) is about 20% bigger than the US gallon (3.78541 litres), so the same car scores about 20% higher in UK mpg. The UK constant is 282.481.
Is higher mpg always better?
Yes for mpg — but L/100km runs the other way: lower is better. A car at 4 L/100km sips fuel; a car at 12 L/100km drinks it.

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Sources & official guidance

Estimate only — US-gallon constant 235.214; UK (imperial) mpg uses 282.481. See our disclaimer.