Convert fuel economy between US MPG, UK MPG, km per liter and L/100km — essential when comparing cars across regions.
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How to use the Fuel Economy
Enter the number you want to convert in the Value field.
Pick the unit you're converting From and the unit you want To.
Read the converted result, or use ⇅ to swap the two units.
Check the All units table to see your value expressed in every supported unit at once.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
About Fuel Economy
Different systems
The US and UK both use miles per gallon but their gallons differ. Europe uses L/100km (lower is better) and some places use km/L.
Why it is not linear
L/100km is an inverse measure — as efficiency rises, the number falls — so converting needs care, which this tool handles for you.
Where it helps
Comparing car specs from different countries and planning fuel costs for a trip.
Frequently asked questions
Is US MPG the same as UK MPG?
No — the UK gallon is larger, so UK MPG figures look higher for the same car.
What does L/100km mean?
Liters of fuel used per 100 km; lower numbers are more efficient.
How do I convert MPG to L/100km?
This tool does it automatically since the relationship is inverse.
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