Miles per Gallon (US) to Kilometers per Liter Converter

A value of 1 Miles per Gallon (US) converts to 0.425143708 Kilometers per Liter; the two units measure the same quantity on different scales, so the relationship is not a fixed factor. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

km-l = convert(mpg-us → L100km → km-l)

Convert Miles per Gallon (US) to the base unit (L100km), then convert to Kilometers per Liter.

Example Conversions

0 Miles per Gallon (US) (mpg-us)

Invalid Kilometers per Liter (km-l)

1 Miles per Gallon (US) (mpg-us)

0.425143708 Kilometers per Liter (km-l)

25 Miles per Gallon (US) (mpg-us)

10.6285927 Kilometers per Liter (km-l)

100 Miles per Gallon (US) (mpg-us)

42.5143708 Kilometers per Liter (km-l)

212 Miles per Gallon (US) (mpg-us)

90.1304661 Kilometers per Liter (km-l)

Conversion Table

Common conversion values from Miles per Gallon (US) to Kilometers per Liter
Miles per Gallon (US) (mpg-us) Kilometers per Liter (km-l)
0 Invalid
1 0.425143708
10 4.25143708
20 8.502874161
25 10.6285927
32 13.60459866
37 15.7303172
50 21.2571854
75 31.8857781
100 42.5143708
212 90.1304661
273.15 116.1280038

How to Convert Manually

Use these steps to convert Miles per Gallon (US) values to Kilometers per Liter without the calculator.

  1. Write down the value in Miles per Gallon (US) (mpg-us) that you want to convert.
  2. Apply the formula: km-l = convert(mpg-us → L100km → km-l).
  3. For example, converting 10 Miles per Gallon (US) gives 4.25143708 Kilometers per Liter.
  4. Label the result as Kilometers per Liter (km-l).

About Miles per Gallon (US) and Kilometers per Liter

Miles per US gallon measures distance per fuel — higher is better. It is the EPA window-sticker figure on every new car sold in the United States. Kilometers per liter measures distance per unit fuel in metric terms — higher is better. Japan, India, and much of Asia and Latin America quote car economy in km/L. The two units are related by a formula rather than a fixed factor; a value of 1 Miles per Gallon (US) corresponds to 0.425143708 Kilometers per Liter. Miles per Gallon (US) to Kilometers per Liter conversion comes up most often in US car shopping and EPA ratings and in US road trip fuel planning, typically when figures need restating for car economy in Japan, India, and Asia.

Precision and Rounding: Fuel economy units are reciprocal of each other — consumption (L/100 km) falls as efficiency (mpg, km/L) rises — so conversions are formula-based, not simple factors, and small mpg differences matter more at low values than high ones. One decimal place is standard for window stickers and trip computers.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 Miles per Gallon (US) equals 6.37715562 Kilometers per Liter.

15 mpg-us -> 6.37715562 km-l

FAQ

How do I convert Miles per Gallon (US) to Kilometers per Liter?

Convert Miles per Gallon (US) to the base unit (L100km), then convert to Kilometers per Liter.

What is the formula for Miles per Gallon (US) to Kilometers per Liter?

The formula is km-l = convert(mpg-us → L100km → km-l).

How many Kilometers per Liter are in 1 Miles per Gallon (US)?

1 Miles per Gallon (US) equals 0.425143708 Kilometers per Liter.

Can I convert Kilometers per Liter back to Miles per Gallon (US)?

Yes. 1 Kilometers per Liter equals 2.35214583 Miles per Gallon (US), and the related converter can reverse the calculation.

What are common names for Miles per Gallon (US) and Kilometers per Liter?

Miles per Gallon (US) is shown as mpg-us and may also be searched as mpg, mpg US, miles per gallon. Kilometers per Liter is shown as km-l and may also be searched as km/L, km/l, kilometres per litre.

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