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Fuel Economy Converter

Convert fuel economy between MPG (US and UK), liters per 100 km, and kilometers per liter.

About this calculator

Convert fuel economy between US MPG, UK MPG, liters per 100 km, and kilometers per liter.

Fuel economy units don't all move the same direction — MPG and km/L go up as a vehicle gets more efficient, while L/100km goes down. This converter handles that automatically, so you can compare a US window-sticker MPG rating directly against a European L/100km spec.

How to use

  1. Enter the fuel economy value.
  2. Select the unit you are converting from and to.
  3. Press Convert to see the result and a full equivalents table.

Tips

  • US and UK gallons are different sizes, so "MPG (US)" and "MPG (UK)" for the same vehicle are not the same number.

Formula

L/100km = 100 ÷ (km/L) MPG (US) = (km/L) × 2.352145833 MPG (UK) = (km/L) × 2.824809363