Fuel Economy Converter
Convert between miles per gallon (mpg), kilometers per liter (km/L), and liters per 100 kilometers (L/100km). Compare vehicle efficiency across US and metric standards.
Formula
km/L = mpg × 0.425144 | L/100km = 235.215 / mpg
Fuel economy units are inversely related — higher mpg means better efficiency, while lower L/100km also means better efficiency. Conversions use the standard equivalence of 1 mpg ≈ 0.425144 km/L.
Example
- Convert: 1 m × 3.28084= 3.28 ft
Result: 1 meter = 3.28 feet
Frequently Asked Questions
How do I convert mpg to L/100km?
Divide 235.215 by the mpg value. For example, 30 mpg equals about 7.84 L/100km.
Which country uses L/100km?
Most countries outside the United States use liters per 100 kilometers. Lower values indicate better fuel efficiency in this system.
Is higher mpg always better?
Yes — higher miles per gallon means the vehicle travels farther on the same amount of fuel, reducing cost and emissions per mile driven.