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

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

What this tool does

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

Inputs

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

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

  • 1 mpg (US) ≈ 1.20095 mpg (imp)
  • 5 mpg (US) ≈ 6.00475 mpg (imp)
  • 10 mpg (US) ≈ 12.009499 mpg (imp)
  • 50 mpg (US) ≈ 60.047496 mpg (imp)
  • 100 mpg (US) ≈ 120.094993 mpg (imp)

Multiply the number of miles per US gallon (mpg US) by about 1.20095 to get miles per imperial gallon (mpg UK). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Mile per US gallon (mpg US): exact by definition. Mile per imperial gallon (mpg UK): 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 UK mpg number bigger than a US mpg number?
A: The imperial gallon is larger than the US gallon, so a car goes more miles on one. 1 mpg (US) is about 1.201 mpg (UK).
Q: How do I convert UK mpg back to US mpg?
A: Choose mpg (UK) in the From box and mpg (US) in the To box. 1 mpg (UK) is about 0.8327 mpg (US).

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