MPG (US) to L/100km
1 mpg (US) equals 235.21 L/100km.
View table →US & Metric (mpg US / L/100km / km/L)
Imperial (UK) mpg
MPG (imperial) to L/100km
1 mpg (imp) equals 282.48 L/100km.
View table →L/100km to MPG (imperial)
1 L/100km equals 282.48 mpg (imp).
View table →MPG (US) to MPG (imperial)
1 mpg (US) equals 1.2 mpg (imp).
View table →MPG (imperial) to MPG (US)
1 mpg (imp) equals 0.833 mpg (US).
View table →km/L to MPG (imperial)
1 km/L equals 2.82 mpg (imp).
View table →MPG (imperial) to km/L
1 mpg (imp) equals 0.354 km/L.
View table →Frequently Asked Questions
How do I convert mpg to L/100km?
US mpg and L/100km are reciprocals of each other: L/100km = 235.21 ÷ mpg. So 30 mpg (US) is about 7.84 L/100km. Because you divide, there is no fixed multiplier — the conversion follows a hyperbola.
What is the difference between US mpg and imperial mpg?
The US gallon (3.785 L) is smaller than the imperial UK gallon (4.546 L). The same fuel economy therefore reads about 20% higher in imperial mpg: 30 mpg (US) is roughly 36 mpg (imperial). For imperial mpg, L/100km = 282.48 ÷ mpg.
How are km/L and L/100km related?
km/L is the efficiency form (higher is better) and L/100km is the consumption form (lower is better). They are reciprocals: L/100km = 100 ÷ (km/L). So 20 km/L equals 5 L/100km.
Why isn't the conversion linear?
Because consumption and efficiency are reciprocals of each other. Double the mpg and the L/100km halves. A linear conversion using a fixed factor would be wrong — you always divide by the value.
Is lower or higher better?
For L/100km, lower is better (less fuel per 100 km). For mpg and km/L, higher is better (more distance per unit of fuel). That is why the two numbers move in opposite directions.