MPG (US) to km/L Converter

ConversionEdited by Hemant Kumar and Anjita Rai, founders · How we checkUpdated Free · No sign-up

Quick answer: To convert MPG to km/L, multiply by 0.4251437. For example, 25 mpg (US) is 10.62859 km/L. One mile per us gallon equals 0.4251437 km/L.

Use the MPG (US) to km/L Converter

MPG (US) to km/L formula and what each symbol means

km/L = mpg (US) × 0.4251437

Symbols used in the formula
SymbolMeaning
mpg (US)Mile per US gallon
km/LKilometer per liter

MPG (US) to km/L examples

8 mpg (US)

8 mpg (US) × 0.4251437 = 3.40115 km/L.

25 mpg (US)

25 mpg (US) × 0.4251437 = 10.62859 km/L.

40 mpg (US)

40 mpg (US) × 0.4251437 = 17.00575 km/L.

MPG (US) compared with km/L

One km/L is 2.352 times as large as one mpg (US), so your number gets smaller when you convert MPG to km/L and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.

About MPG and km/L

Mile per US gallon (mpg (US)): Miles per US gallon. Kilometer per liter (km/L): Kilometres travelled per litre of fuel.

Where MPG to km/L conversions are used

Fleet and trip-cost planning start from consumption figures. Cars are rated in litres per 100 km in Europe and India, mpg in the US and UK, and km/L in several Asian markets.

How to calculate MPG (US) to km/L step by step

  1. Enter the value in mpg (US) (the starting unit).
  2. Multiply by 0.4251437, because 1 mpg (US) = 0.4251437 km/L.
  3. The product is the value in km/L. To go back, divide by 0.4251437 or multiply by 2.352146.

Popular fuel consumption conversions

How to read your MPG (US) to km/L result

Quick estimate: multiply by about 0.43 to get km/L from MPG; this is within 1.2% of the exact factor. Fuel economy can be written as distance per volume (km/L, mpg) or volume per distance (L/100 km).

MPG (US)KM/L
52.125719
62.550862
83.40115
104.251437
156.377156
208.502874
3012.75431
4017.00575

km/L to MPG (US): quick table

KM/LMPG (US)
716.46502
1228.22575
1842.33863
2251.74721
3070.56437
3582.3251

Common mistakes when calculating MPG (US) to km/L

  • Comparing a car quoted in L/100 km with another in mpg without converting.
  • Dividing when you should multiply: from mpg (US) to km/L multiply by 0.4251437; from km/L to mpg (US) divide by 0.4251437.

MPG (US) to km/L FAQ

How many km/L are in 1 mpg (US)?

1 mpg (US) equals 0.4251437 km/L.

How many mpg (US) are in 1 km/L?

1 km/L equals 2.352146 mpg (US).

Is 1 mpg (US) = 0.4251437 km/L an exact conversion?

The factor is shown rounded to 7 significant figures (0.4251437). The calculator above uses more digits.

What is a mile per US gallon (mpg (US))?

Miles per US gallon.

How can I estimate MPG to km/L in my head?

Quick estimate: multiply by about 0.43 to get km/L from MPG; this is within 1.2% of the exact factor.

What is 18 mpg (US) in km/L?

18 mpg (US) = 7.652587 km/L (since 18 × 0.4251437).

What is 12 mpg (US) in km/L?

12 mpg (US) = 5.101724 km/L (since 12 × 0.4251437).

What is 7 mpg (US) in km/L?

7 mpg (US) = 2.976006 km/L (since 7 × 0.4251437).

How many decimals should I keep when converting mpg (US) to km/L?

Match the precision of your original measurement. For example, 10.62859 km/L rounds to 10.6 km/L at 3 significant figures; keep more digits only for engineering or scientific work.

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Method, review and disclaimer

Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors