MPG (US) to km/L Converter
Enter a value below to convert US miles per gallon to kilometers per liter. Both units measure distance per fuel, so you multiply: km/L = mpg (US) × 0.42514371 - for example 30 mpg (US) is 12.75 km/L. For the opposite direction, use our km/L to mpg (US) converter.
30 mpg (US) = 12.75 km/L. Convert US miles per gallon to kilometers per liter. Need the reverse? See km/L to mpg (US).
US miles per gallon
- Definition
- US miles per gallon (symbol: mpg (US)) is a measure of fuel economy: the distance in miles a vehicle travels on one US gallon of fuel. The US gallon is 3.785 liters, smaller than the UK (Imperial) gallon of 4.546 liters, so a US MPG figure is always lower than the UK MPG figure for the same car.
- History / origin
- It is built from the US customary gallon and the statute mile. Because a higher number means more distance per gallon, MPG is the inverse sense of liters-per-100-km style figures used in much of the rest of the world.
- Current use
- US MPG is the standard fuel-economy unit in the United States, where EPA city and highway ratings appear on every new-car window sticker and in fuel-cost comparisons.
Kilometers per liter
- Definition
- Kilometers per liter (symbol: km/L) is a measure of fuel economy: the distance in kilometers a vehicle travels on one liter of fuel. Like MPG, a higher number means a more efficient car, so it converts to US MPG by a simple multiplying factor.
- History / origin
- It is a metric distance-per-volume unit, built from the kilometer and the liter. It keeps the intuitive "more is better" sense of miles per gallon while using metric quantities, unlike the liters-per-100-km figure favored in Europe.
- Current use
- Kilometers per liter is the common fuel-economy unit in Japan, India and parts of Asia and the Middle East, quoted on car brochures, trip computers and in everyday talk about how far a tank will go.
US MPG to kilometers per liter conversion table
| US miles per gallon [mpg (US)] | Kilometers per liter [km/L] |
|---|---|
| 15 mpg (US) | 6.3771556115 km/L |
| 20 mpg (US) | 8.5028741486 km/L |
| 25 mpg (US) | 10.6285926858 km/L |
| 30 mpg (US) | 12.7543112229 km/L |
| 35 mpg (US) | 14.8800297601 km/L |
| 40 mpg (US) | 17.0057482972 km/L |
| 45 mpg (US) | 19.1314668344 km/L |
| 50 mpg (US) | 21.2571853715 km/L |
| 60 mpg (US) | 25.5086224458 km/L |
| 70 mpg (US) | 29.7600595201 km/L |
Popular US MPG to kilometers per liter conversions
Everyday fuel-economy figures, rounded to two decimals - the kind of numbers you meet on real car specifications.
| US miles per gallon [mpg (US)] | Kilometers per liter [km/L] |
|---|---|
| 20 mpg (US) | 8.50 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 |
| 55 mpg (US) | 23.38 km/L |
| 60 mpg (US) | 25.51 km/L |
| 70 mpg (US) | 29.76 km/L |
How to convert MPG (US) to km/L
To convert US MPG to km/L, multiply the mpg (US) value by 0.42514371. Both units measure distance per unit of fuel, so the relationship is a simple linear scaling - no reciprocal is involved. For example, 30 mpg (US) = 30 × 0.42514371 = 12.75 km/L.
The factor 0.42514371 comes from the US gallon (3.785411784 liters) and the mile (1.609344 km). Each conversion is a single multiplication:
km/L = mpg (US) × 0.42514371
mpg (US) = km/L × 2.35214583
Example. A car rated at 40 mpg (US) does 40 × 0.42514371 = 17.01 km/L, while an efficient 50 mpg (US) does 50 × 0.42514371 = 21.26 km/L.
When you need to convert MPG (US) to km/L
Drivers and buyers move between US miles per gallon and kilometers per liter whenever US and Asian-market figures meet. Common cases:
- Reading a US EPA fuel-economy rating in km/L the way it is quoted in Japan or India.
- Comparing a US-market car's MPG against a local spec sheet given in km/L.
- Working out how far a tank goes in kilometers when you only know the MPG.
- Translating an American review's MPG claim into km/L to compare two cars fairly.
- Budgeting fuel for a trip abroad when distances are in kilometers but the rating is MPG.
Frequently asked questions
How do I convert US miles per gallon to kilometers per liter?
Multiply the mpg (US) value by 0.42514371. For example, 30 mpg (US) equals 30 × 0.42514371 = 12.75 km/L. Both units measure distance per fuel, so a higher mpg gives a higher km/L.
What is 30 mpg (US) in km/L?
30 mpg (US) is 12.75 km/L, found by multiplying 30 by 0.42514371. The same car measured in Imperial gallons would read 36.03 mpg (UK).
What is the mpg (US) to km/L formula?
The formula is km/L = mpg (US) × 0.42514371. To convert back, multiply km/L by 2.35214583. Both directions are simple multiplications because the units scale linearly.
Is this the US or UK gallon?
This page uses the US gallon of 3.785 liters. The UK (Imperial) gallon is larger at 4.546 liters, so a UK mpg figure converts to a different km/L value and needs the mpg (UK) converter instead.
What is a good km/L figure for a car?
Around 17 to 21 km/L, roughly 40 to 50 mpg (US), is efficient for a modern petrol car. 30 mpg (US) is about 12.75 km/L, while under 8.5 km/L, below 20 mpg (US), is thirsty.
How do I convert km/L back to mpg (US)?
Multiply the km/L value by 2.35214583, or use our km/L to mpg (US) converter. For example, 12.75 km/L is 12.75 × 2.35214583 = 29.99 mpg (US).
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