⛽Fuel Efficiency Converter

Convert between km/L, L/100km, US mpg, and UK mpg instantly

How to Use the Fuel Efficiency Converter

Enter your fuel economy figure, select the unit, and all four units appear instantly: km/L, L/100km, US mpg, and UK mpg. Useful for comparing car specs across different regions.

Unit Overview

km/L: Standard in Japan and South Korea. Higher = better. 1 km/L = 2.352 US mpg.

L/100km: Standard in Europe. Lower = better. It's the inverse of km/L — 15 km/L = 6.67 L/100km.

mpg US: US standard (3.785 L gallon). EPA window sticker ratings use this unit. 30 US mpg ≈ 12.75 km/L.

mpg UK: British standard (4.546 L gallon, about 20% larger). 36 UK mpg ≈ 30 US mpg — same car, different number.

Quick Reference

20 mpg (US) ≈ 8.5 km/L ≈ 11.76 L/100km  |  30 mpg (US) ≈ 12.75 km/L ≈ 7.84 L/100km  |  40 mpg (US) ≈ 17.0 km/L ≈ 5.88 L/100km

FAQ

A European car is rated 6.0 L/100km — is that good?

Yes, 6.0 L/100km = 16.67 km/L = 39.2 US mpg. That's very efficient for a gasoline car. To convert any L/100km value, enter it above with L/100km selected.

My car gets 25 US mpg — what would that be in UK mpg?

25 US mpg ÷ 2.352 × 2.825 ≈ 30.1 UK mpg. You can verify this instantly using the converter above.