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Fuel Efficiency Converter

Convert between km/l, mpg and l/100km.

Last updated: 21 Aug 2026

Quick answer

Fuel efficiency converts between km/l, miles per gallon (US) and litres per 100 km. For example, 20 km/l ≈ 47 mpg ≈ 5 l/100km. Note l/100km is inverse — lower is better. Enter a value and units above.

Convert fuel efficiency between km/l, mpg (US) and l/100km. Remember l/100km is an inverse measure — a lower number means better efficiency.

How to convert fuel efficiency units

  1. 1 Enter the value.
  2. 2 Choose the units to convert from and to.
  3. 3 The converted efficiency appears instantly.

Frequently asked questions

How do I convert km/l to mpg?
Multiply km/l by about 2.352 to get US mpg — 20 km/l ≈ 47 mpg.
How do I convert km/l to l/100km?
Divide 100 by the km/l value — 20 km/l = 5 l/100km.
Is higher always better?
For km/l and mpg, higher is better; for l/100km, lower is better.

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