Fuel Economy Converter

Convert fuel economy between miles per US gallon, miles per Imperial gallon, kilometers per liter, and liters per 100 kilometers.

Fuel Economy

From Unit

Fuel Consumption

Ready

Enter a fuel economy value to convert units.

MPG (US)

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MPG (Imperial)

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km/L

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L/100km

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Unit	System	Value	Formula	Copy

MPG and km/L increase as efficiency improves. L/100km measures consumption, so lower values are better.

About this tool

Fuel Economy helps drivers, fleet teams, travelers, and analysts convert vehicle efficiency between MPG, km/L, and L/100km. Use it to compare window stickers, trip notes, imported vehicle specifications, or maintenance records when US and Imperial gallon differences matter.

Use cases

Convert MPG (US) to L/100km for international vehicle comparisons.
Translate km/L ratings into MPG for travel, fleet, or maintenance notes.
Compare US MPG and Imperial MPG without mixing gallon definitions.

FAQ

Does Fuel Economy support both US and Imperial MPG?

Yes. Choose MPG (US) or MPG (Imperial) so gallon size is handled explicitly before converting to km/L or L/100km.

Why does L/100km move opposite from MPG?

MPG and km/L measure distance per fuel volume, so higher is more efficient. L/100km measures fuel used for a fixed distance, so lower is more efficient.

Can I use the API for fuel economy conversions?

Yes. Send value, from, and to parameters to /fuel-economy/api with units such as mpg_us, mpg_imp, km_l, or l_100km.