Fuel Consumption / km/L → mpg (imp)
Convert Kilometers per liter to Miles per imperial gallon
Convert vehicle fuel use and fuel economy with reciprocal formulas. Convert Kilometers per liter (km/L) to Miles per imperial gallon (mpg (imp)). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Miles per imperial gallon to Kilometers per liter →
How to convert kilometers per liter 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 km/L, b for the intermediate value in L/100 km, and y for the result in mpg (imp).
b = 100 ÷ x; y = 282.480936332 ÷ b
Worked examples
10 km/L ≈ 28.2480936332 mpg (imp)
Step 1: 100 ÷ 10 ≈ 10 L/100 km.
Step 2: 282.480936332 ÷ 10 ≈ 28.2480936332 mpg (imp).20 km/L ≈ 56.4961872664 mpg (imp)
Step 1: 100 ÷ 20 ≈ 5 L/100 km.
Step 2: 282.480936332 ÷ 5 ≈ 56.4961872664 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 Kilometers per liter
Kilometers per liter relates inversely to Liters per 100 kilometers. The base value is 100 ÷ x, where x is the numerical value in km/L. A zero or negative reciprocal input is outside this calculator’s physical domain.
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.
Kilometers per liter to miles per imperial gallon reference table
| Kilometers per liter (km/L) | Miles per imperial gallon (mpg (imp)) |
|---|---|
| 1 | 2.82480936332 |
| 5 | 14.1240468166 |
| 10 | 28.2480936332 |
| 25 | 70.620234083 |
| 50 | 141.240468166 |
| 100 | 282.480936332 |
| 1000 | 2824.80936332 |
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