Convert fuel economy and consumption between MPG (US), MPG (UK), Liters per 100km (L/100km), and km/L with reciprocal calculations and exact formulas.
12.00949926 Miles per Gallon
Fuel economy expressions measure distance per unit volume (miles per gallon or kilometers per liter). Fuel consumption expressions measure volume used per fixed distance (liters per 100 kilometers). Because of this reciprocal relationship, converting between them requires dividing the conversion constant rather than simple multiplication.
The United States and United Kingdom primarily use miles per gallon (with their respective gallon sizes), while Europe, Australia, and international regulatory frameworks rely on Liters per 100km (L/100km). Japan and several Asian markets commonly use kilometers per liter (km/L).
Because MPG measures distance per volume and L/100km measures volume per distance, their relationship is inverse: L/100km = 235.215 / MPG (US). For example, 30 MPG (US) equals approximately 7.84 L/100km.
A British Imperial gallon is larger (4.546 liters) than a US liquid gallon (3.785 liters). Therefore, 1 MPG (UK) equals approximately 0.8327 MPG (US), or conversely 1 MPG (US) equals 1.201 MPG (UK).
To convert kilometers per liter to liters per 100km, divide 100 by the km/L value (L/100km = 100 / km/L). For instance, 15 km/L equals 6.67 L/100km.
For L/100km, lower numbers indicate better fuel economy (less fuel burned per 100 kilometers). For MPG and km/L, higher numbers indicate greater efficiency (more distance per unit of fuel).
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