MPG (UK) to MPG (US) Converter

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

Quick answer: To convert MPG to MPG, multiply by 0.8326742. For example, 25 mpg (UK) is 20.81685 mpg (US). One mile per imperial gallon equals 0.8326742 mpg (US).

Use the MPG (UK) to MPG (US) Converter

MPG (UK) to MPG (US) formula and what each symbol means

mpg (US) = mpg (UK) × 0.8326742

Symbols used in the formula
SymbolMeaning
mpg (UK)Mile per imperial gallon
mpg (US)Mile per US gallon

MPG (UK) to MPG (US) examples

8 mpg (UK)

8 mpg (UK) × 0.8326742 = 6.661393 mpg (US).

25 mpg (UK)

25 mpg (UK) × 0.8326742 = 20.81685 mpg (US).

40 mpg (UK)

40 mpg (UK) × 0.8326742 = 33.30697 mpg (US).

MPG (UK) compared with MPG (US)

One mpg (US) is 1.201 times as large as one mpg (UK), so your number gets smaller when you convert MPG to MPG and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.

About MPG and MPG

Mile per imperial gallon (mpg (UK)): Miles per imperial gallon. Mile per US gallon (mpg (US)): Miles per US gallon.

Where MPG to MPG 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 (UK) to MPG (US) step by step

  1. Enter the value in mpg (UK) (the starting unit).
  2. Multiply by 0.8326742, because 1 mpg (UK) = 0.8326742 mpg (US).
  3. The product is the value in mpg (US). To go back, divide by 0.8326742 or multiply by 1.20095.

Popular fuel consumption conversions

How to read your MPG (UK) to MPG (US) result

Quick estimate: multiply by about 0.83 to get MPG from MPG; this is within 0.4% of the exact factor. US and UK miles per gallon differ because the gallons differ.

MPG (UK)MPG (US)
54.163371
64.996045
86.661393
108.326742
1512.49011
2016.65348
3024.98023
4033.30697

MPG (US) to MPG (UK): quick table

MPG (US)MPG (UK)
78.406649
1214.4114
1821.6171
2226.4209
3036.0285
3542.03325

Common mistakes when calculating MPG (UK) to MPG (US)

  • Comparing a car quoted in L/100 km with another in mpg without converting.
  • Dividing when you should multiply: from mpg (UK) to mpg (US) multiply by 0.8326742; from mpg (US) to mpg (UK) divide by 0.8326742.

MPG (UK) to MPG (US) FAQ

How many mpg (US) are in 1 mpg (UK)?

1 mpg (UK) equals 0.8326742 mpg (US).

How many mpg (UK) are in 1 mpg (US)?

1 mpg (US) equals 1.20095 mpg (UK).

Is 1 mpg (UK) = 0.8326742 mpg (US) an exact conversion?

The factor is shown rounded to 7 significant figures (0.8326742). 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 MPG in my head?

Quick estimate: multiply by about 0.83 to get MPG from MPG; this is within 0.4% of the exact factor.

What is 12 mpg (UK) in MPG?

12 mpg (UK) = 9.99209 mpg (US) (since 12 × 0.8326742).

What is 7 mpg (UK) in MPG?

7 mpg (UK) = 5.828719 mpg (US) (since 7 × 0.8326742).

What is 35 mpg (UK) in MPG?

35 mpg (UK) = 29.1436 mpg (US) (since 35 × 0.8326742).

How many decimals should I keep when converting mpg (UK) to mpg (US)?

Match the precision of your original measurement. For example, 20.81685 mpg (US) rounds to 20.8 mpg (US) 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