Convert fuel efficiency between L/100 km, US MPG, imperial (UK) MPG and km/L.. Fuel Economy Converter is a free online tool from the ToolsRift Special Unit Converters collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
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How to use Fuel Economy Converter
Type a value in any field. The tool converts through L/100 km using each inverse factor to fill US MPG, UK MPG and km/L.
Frequently asked questions
How does L/100 km relate to US MPG?
MPG(US) = 235.214583 ÷ (L/100 km); the two scales are inversely related.
Why do US and UK MPG differ?
The imperial gallon is larger, so UK MPG = 282.480936 ÷ (L/100 km) gives higher numbers than US MPG.
Is a lower L/100 km better?
Yes — fewer litres per 100 km means better efficiency, unlike MPG where higher is better.
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