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Miles per Gallon (UK) to Miles per Gallon (US) Converter

Convert fuel efficiency from UK MPG to US MPG with this free calculator.

What this tool does

Convert fuel efficiency from UK MPG to US MPG with this free calculator. Type an amount in miles per imperial gallon (mpg UK), choose the units, and the tool converts it to miles per US gallon (mpg US). It converts between these two fuel economy units, in either direction.

Inputs

  • Value: A number.
  • From: Choose one: Mile per imperial gallon (mpg UK), Mile per US gallon (mpg US). Starts as Mile per imperial gallon (mpg UK).
  • To: Choose one of the same 2 units as "From". Starts as Mile per US gallon (mpg US).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount. It appears once every required field has a valid value.

Worked examples

Conversions from miles per imperial gallon (mpg UK) to miles per US gallon (mpg US):

  • 1 mpg (imp) ≈ 0.832674 mpg (US)
  • 5 mpg (imp) ≈ 4.163371 mpg (US)
  • 10 mpg (imp) ≈ 8.326742 mpg (US)
  • 50 mpg (imp) ≈ 41.633709 mpg (US)
  • 100 mpg (imp) ≈ 83.267418 mpg (US)

Multiply the number of miles per imperial gallon (mpg UK) by about 0.832674 to get miles per US gallon (mpg US). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Mile per imperial gallon (mpg UK): exact by definition. Mile per US gallon (mpg US): exact by definition.

Limitations

  • Converts the unit of a fuel economy figure only. It does not work out fuel cost, trip fuel or a car's real-world economy.
  • A US gallon and an imperial gallon are different volumes, so mpg (US) and mpg (UK) are shown as separate units.

FAQs

Q: Why is a US mpg number smaller than a UK mpg number?
A: The US gallon is smaller than the imperial gallon, so a car goes fewer miles on one. 1 mpg (UK) is about 0.8327 mpg (US).
Q: How do I convert US mpg to UK mpg?
A: Choose mpg (US) in the From box and mpg (UK) in the To box. 1 mpg (US) is about 1.201 mpg (UK).

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