Fuel Consumption / mpg (US) → km/L
Convert Miles per US liquid gallon to Kilometers per liter
Convert vehicle fuel use and fuel economy with reciprocal formulas. Convert Miles per US liquid gallon (mpg (US)) to Kilometers per liter (km/L). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Kilometers per liter to Miles per US liquid gallon →
How to convert Miles per US liquid gallon to kilometers per liter
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 mpg (US), b for the intermediate value in L/100 km, and y for the result in km/L.
b = 235.214583333 ÷ x; y = 100 ÷ b
Worked examples
10 mpg (US) ≈ 4.2514370743 km/L
Step 1: 235.214583333 ÷ 10 ≈ 23.5214583333 L/100 km.
Step 2: 100 ÷ 23.5214583333 ≈ 4.2514370743 km/L.20 mpg (US) ≈ 8.50287414861 km/L
Step 1: 235.214583333 ÷ 20 ≈ 11.7607291667 L/100 km.
Step 2: 100 ÷ 11.7607291667 ≈ 8.50287414861 km/L.
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 Miles per US liquid gallon
Miles per US liquid gallon relates inversely to Liters per 100 kilometers. The base value is 235.214583333 ÷ x, where x is the numerical value in mpg (US). A zero or negative reciprocal input is outside this calculator’s physical domain.
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.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Miles per US liquid gallon to kilometers per liter reference table
| Miles per US liquid gallon (mpg (US)) | Kilometers per liter (km/L) |
|---|---|
| 1 | 0.42514370743 |
| 5 | 2.12571853715 |
| 10 | 4.2514370743 |
| 25 | 10.6285926858 |
| 50 | 21.2571853715 |
| 100 | 42.514370743 |
| 1000 | 425.14370743 |
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