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Convert between MPG, L/100km, and km/L. Includes US and UK gallon conversions.
Fuel economy measures how far a vehicle can travel per unit of fuel. It is expressed as miles per gallon (MPG), liters per 100 kilometers (L/100km), or kilometers per liter (km/L).
Lower is better (inverse scale)
| Vehicle Type | mpg (US) | L/100km | km/L |
|---|---|---|---|
| Full-size truck | 18 | 13.1 | 7.7 |
| SUV (midsize) | 25 | 9.4 | 10.6 |
| Sedan (average) | 32 | 7.4 | 13.6 |
| Compact car | 38 | 6.2 | 16.2 |
| Hybrid (typical) | 52 | 4.5 | 22.1 |
| Hybrid (efficient) | 60 | 3.9 | 25.5 |
Divide 235.215 by MPG. This is inverse: higher MPG = lower L/100km.
L/100km = 235.215 ÷ mpg (US)
Multiply by 0.425. This is a direct ratio: higher MPG = higher km/L.
km/L = mpg (US) × 0.425144
UK gallons are 20% larger. Multiply US MPG by 1.201 to get UK MPG.
mpg (UK) = mpg (US) × 1.20095
Formula
L/100km = 235.215 ÷ mpg (US) | km/L = mpg (US) × 0.425144mpg (US) = miles per US gallon — higher is better; US standard for fuel economy
L/100km = liters per 100 km — European standard; lower is better (inverse scale)
km/L = kilometers per liter — Asian/Latin American standard; higher is better
mpg (UK) = miles per Imperial gallon — UK standard; ~20% higher than US MPG for same vehicle
Worked Example
Convert 35 mpg (US) to L/100km and km/L
Did you know? The US EPA's CAFE (Corporate Average Fuel Economy) standard requires automakers' fleets to average at least 49 mpg by 2026. A 1 mpg improvement across all US vehicles would save roughly 4 billion gallons of fuel per year.
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