9.4086
L/100 km
10.6286
km/L
9.4086
L/100 km
10.6286
km/L
The Miles per Gallon to Liters per 100 Kilometers Converter bridges the two most common fuel economy standards in the world. MPG (US) is the standard in North America, while L/100 km is used across Europe, Australia, and most other countries. This converter is indispensable for comparing vehicle efficiency across markets, understanding imported car specifications, and interpreting international fuel economy data.
The conversion formula uses the constant 235.215: L/100 km = 235.215 / MPG. This number arises from the relationship between US gallons, liters, miles, and kilometers. Because the two scales are inversely related, the conversion is a division rather than a multiplication — as MPG increases, L/100 km decreases.
This inverse relationship means that improvements at the low end of MPG produce much larger savings in L/100 km (and in actual fuel consumption) than the same improvement at the high end. Improving from 15 to 20 MPG saves 3.92 L/100 km, while improving from 35 to 40 MPG saves only 0.84 L/100 km. This asymmetry is why many economists argue that L/100 km is a more rational metric for consumers.
Our converter also provides the result in km/L (kilometers per liter), which is a linear scale like MPG but using metric units. This is the standard in Japan and several Asian countries.
The formulas: L/100 km = 235.215 / MPG and km/L = MPG × 0.425144. The constant 235.215 = 100 × 3.78541 (liters per US gallon) / 1.60934 (km per mile).
Conversion table: 15 MPG = 15.68 L/100km, 20 MPG = 11.76, 25 MPG = 9.41, 30 MPG = 7.84, 35 MPG = 6.72, 40 MPG = 5.88, 50 MPG = 4.70.
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Results
25 MPG = 9.41 L/100km
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Results
50 MPG = 4.70 L/100km
Divide 235.215 by the MPG value. Example: 30 MPG → 235.215 / 30 = 7.84 L/100 km.
Because the scales are inverse: MPG measures distance/fuel (higher = more efficient), L/100 km measures fuel/distance (lower = more efficient). Doubling MPG halves L/100 km.
It combines unit conversions: 1 US gallon = 3.78541 liters, 1 mile = 1.60934 km. So: 100 × 3.78541 / 1.60934 = 235.215.
25 MPG = 235.215 / 25 = 9.41 L/100 km. This is the approximate US fleet average.
40 MPG = 235.215 / 40 = 5.88 L/100 km. This is considered very good efficiency for a gasoline vehicle.
This converter uses US gallons (3.785 L). For Imperial gallons (4.546 L), the constant would be 282.481 instead of 235.215.
L/100 km linearly represents actual fuel consumption. Improving from 10 to 20 MPG saves far more fuel than 30 to 40 MPG, but the MPG scale obscures this. L/100 km makes the savings transparent.
EPA estimates are typically 10-20% optimistic. Real-world factors (aggressive driving, AC, cold weather, hilly terrain) reduce fuel economy compared to lab conditions.
The EU requires automakers to achieve fleet-average CO₂ emissions of 95 g/km (≈4.1 L/100 km gasoline, ≈3.6 L/100 km diesel) since 2021, with stricter targets through 2035.
Higher altitude means thinner air, reducing engine power but also reducing aerodynamic drag. The net effect is usually a slight improvement (2-5%) in fuel economy at moderate altitudes.
Roboculator Team
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