Fuel Consumption / L/km → mpg (imp)
Convert Liters per kilometer to Miles per imperial gallon
Convert vehicle fuel use and fuel economy with reciprocal formulas. Convert Liters per kilometer (L/km) to Miles per imperial gallon (mpg (imp)). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Miles per imperial gallon to Liters per kilometer →
How to convert liters per kilometer to miles per imperial gallon
Consumption measures fuel per distance; economy measures distance per fuel. Their relationship is reciprocal. US and imperial mpg use different gallons. Inputs must be positive; zero fuel use would imply infinite economy.
Use x for the value in L/km, b for the intermediate value in L/100 km, and y for the result in mpg (imp).
b = (x × 100); y = 282.480936332 ÷ b
Worked examples
10 L/km ≈ 0.282480936332 mpg (imp)
Step 1: (10 × 100) ≈ 1000 L/100 km.
Step 2: 282.480936332 ÷ 1000 ≈ 0.282480936332 mpg (imp).20 L/km ≈ 0.141240468166 mpg (imp)
Step 1: (20 × 100) ≈ 2000 L/100 km.
Step 2: 282.480936332 ÷ 2000 ≈ 0.141240468166 mpg (imp).
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Liters per kilometer
Liters per kilometer (L/km) measures fuel consumption under the conventions above. The base value in L/100 km is (x × 100), where x is the numerical value in L/km. Factors shown here are rounded for display; calculations use the stored factor.
About Miles per imperial gallon
Miles per imperial gallon relates inversely to Liters per 100 kilometers. The base value is 282.480936332 ÷ x, where x is the numerical value in mpg (imp). A zero or negative reciprocal input is outside this calculator’s physical domain.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Liters per kilometer to miles per imperial gallon reference table
| Liters per kilometer (L/km) | Miles per imperial gallon (mpg (imp)) |
|---|---|
| 1 | 2.82480936332 |
| 5 | 0.564961872664 |
| 10 | 0.282480936332 |
| 25 | 0.112992374533 |
| 50 | 0.0564961872664 |
| 100 | 0.0282480936332 |
| 1000 | 0.00282480936332 |
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