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Conversion Calculators

Fuel Economy Converter

Compare vehicle fuel efficiency across countries. Note that L/100 km is a consumption figure, so lower is better, while km/L and mpg are economy figures, where higher is better.

18 km/L =5.5555556 L/100 km
Step-by-step working
  1. Convert km/L to kilometre per litre, then to L/100 km (non-linear scale)
  2. Result: 5.5555556 L/100 km

18 km/L in every unit

UnitValue
Kilometres per litre (km/L)18
Litres per 100 km (L/100 km)5.5555556
Miles per gallon (US)42.338625
Miles per gallon (UK)50.846569
Miles per litre11.184681

How to use the Fuel Economy Converter

  1. Enter the value to convert.
  2. Choose the unit you have and the unit you want.
  3. Press Convert. The table below shows the value in every unit.

Formula

L/100 km = 100 ÷ (km/L)   1 US mpg = 0.425144 km/L   1 UK mpg = 0.354006 km/L

Examples

  • 18 km/L = 5.56 L/100 km = 42.34 US mpg.
  • 30 US mpg = 7.84 L/100 km.

Frequently asked questions

Why do UK cars seem more efficient in mpg?

A UK gallon is about 20% larger than a US gallon, so the same car shows a higher UK mpg.

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