Fuel Economy Converter
Convert fuel economy between miles per gallon and liters per 100 kilometers, the two ways the world measures how thirsty a car is. This is not a simple multiplication: mpg measures distance per fuel while L/100km measures fuel per distance, so the two are inversely related and the tool applies the correct reciprocal formula. It also separates US gallons from UK (imperial) gallons, since a UK mpg figure looks better than a US one for the exact same car. Pick the units you have and want, type a value, and the converted figure updates live as you type. Everything is computed in your browser, so results are instant, your numbers stay private, and it keeps working offline once the page loads.
How to use Fuel Economy Converter
- Enter a fuel economy value in the unit you have.
- Select US MPG, UK MPG, or L/100km as needed.
- Read and copy the converted figure.
Frequently asked questions
What fuel economy units does it convert?
It converts between miles per gallon (US and UK) and liters per 100 km.
Why is fuel economy conversion not a straight ratio?
MPG measures distance per volume while L/100km measures volume per distance, so the tool uses a reciprocal formula between them.
Do US and UK gallons give the same MPG?
No. A UK gallon is larger than a US gallon, so the same car has a different MPG figure in each, and both are offered.
What is Fuel Economy Converter?
Convert fuel economy between miles per gallon and liters per 100 kilometers, the two ways the world measures how thirsty a car is. This is not a simple multiplication: mpg measures distance per fuel while L/100km measures fuel per distance, so the two are inversely related and the tool applies the correct reciprocal formula.
Is Fuel Economy Converter free to use?
Yes. Fuel Economy Converter is completely free, with no sign-up and no usage limits.
Does Fuel Economy Converter work in a web browser?
Yes. Fuel Economy Converter runs in any modern web browser. There is nothing to download or install.
Is my data private with Fuel Economy Converter?
Yes. Fuel Economy Converter runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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