Convert mpg (US) to km/L instantly — with a table, typical fuel-economy values, and a live calculator.
1 mpg (US) equals 0.425 km/L.
Consumption (L/100km) and efficiency (mpg, km/L) are reciprocals of each other: a higher mpg means a lower L/100km. Double the mpg and you halve the L/100km — so the conversion follows a hyperbola, not a straight line. Concretely: L/100km = 235.21 ÷ mpg (US).
| mpg (US) | km/L |
|---|---|
| 10 mpg (US) | 4.25 km/L |
| 15 mpg (US) | 6.38 km/L |
| 20 mpg (US) | 8.5 km/L |
| 25 mpg (US) | 10.63 km/L |
| 30 mpg (US) | 12.75 km/L |
| 35 mpg (US) | 14.88 km/L |
| 40 mpg (US) | 17.01 km/L |
| 45 mpg (US) | 19.13 km/L |
| 50 mpg (US) | 21.26 km/L |
| 60 mpg (US) | 25.51 km/L |
| 70 mpg (US) | 29.76 km/L |
| 80 mpg (US) | 34.01 km/L |
| 100 mpg (US) | 42.51 km/L |
| km/L | mpg (US) |
|---|---|
| 5 km/L | 11.76 mpg (US) |
| 8 km/L | 18.82 mpg (US) |
| 10 km/L | 23.52 mpg (US) |
| 12 km/L | 28.23 mpg (US) |
| 15 km/L | 35.28 mpg (US) |
| 18 km/L | 42.34 mpg (US) |
| 20 km/L | 47.04 mpg (US) |
| 22 km/L | 51.75 mpg (US) |
| 25 km/L | 58.8 mpg (US) |
| 28 km/L | 65.86 mpg (US) |
| 30 km/L | 70.56 mpg (US) |
| 35 km/L | 82.33 mpg (US) |
| 40 km/L | 94.09 mpg (US) |
| Vehicle type | mpg (US) | km/L |
|---|---|---|
| Efficient hybrid | 58.8 mpg (US) | 25 km/L |
| Small economy car | 47.04 mpg (US) | 20 km/L |
| Compact car | 36.19 mpg (US) | 15.38 km/L |
| Mid-size sedan | 29.4 mpg (US) | 12.5 km/L |
| Large SUV | 21.38 mpg (US) | 9.09 km/L |
| Thirsty pickup | 16.8 mpg (US) | 7.14 km/L |
L/100km is the standard figure across continental Europe and a consumption measure: lower is better. mpg (miles per gallon) is an efficiency measure: higher is better. Watch out — the US gallon (3.785 L) is smaller than the imperial UK gallon (4.546 L), so the same fuel economy reads about 20% higher in UK mpg. km/L is the efficiency form of L/100km, common across parts of Asia and Latin America.
Because mpg and L/100km are reciprocals, you can never turn one into the other with a fixed multiplier — you always divide by the value. For more pairs, use our fuel economy conversion hub.
1 mpg (US) equals 0.425 km/L.
30 mpg (US) equals 12.75 km/L.
Consumption (L/100km) and efficiency (mpg, km/L) are reciprocals of each other: a higher mpg means a lower L/100km. If the mpg doubles, the L/100km halves — so there is no fixed multiplier; you divide by the value instead. That is why the curve is a hyperbola, not a straight line.
km/L is the “efficiency” form (higher is better), and L/100km is the “consumption” form (lower is better). They are reciprocals through L/100km = 100 ÷ (km/L). So 20 km/L equals 5 L/100km, and 10 km/L equals 10 L/100km.
L/100km is the standard figure across continental Europe (lower is better). US mpg is used in the United States and imperial mpg in the United Kingdom — both express miles per gallon (higher is better) but use different-sized gallons. km/L is common across parts of Asia, Latin America, and Africa.
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