MPG (US) to MPG (UK) Converter
Enter a value below to convert US miles per gallon to UK miles per gallon. Both figures measure the same economy, so you multiply: mpg (UK) = mpg (US) × 1.20094993 - for example 30 mpg (US) is 36.03 mpg (UK). For the opposite direction, use our mpg (UK) to mpg (US) converter.
30 mpg (US) = 36.03 mpg (UK). Convert US miles per gallon to UK miles per gallon. Need the reverse? See mpg (UK) to mpg (US).
US miles per gallon
- Definition
- US miles per gallon (symbol: mpg (US)) is a measure of fuel economy: the distance in miles a vehicle travels on one US gallon of fuel (3.785 liters). A higher number means a more efficient car. Because the US gallon is smaller than the UK gallon, the US MPG figure is always the lower of the two.
- History / origin
- It is built from the US customary gallon and the statute mile. The US gallon (3.785 L) was fixed at 231 cubic inches, smaller than the UK (Imperial) gallon of 4.546 L, which is why a single car carries two different MPG numbers depending on which gallon is used.
- Current use
- US MPG is the standard fuel-economy unit in the United States, where EPA city and highway ratings appear on every new-car window sticker and in fuel-cost comparisons.
UK miles per gallon
- Definition
- UK miles per gallon (symbol: mpg (UK)) is a measure of fuel economy based on the Imperial gallon: the distance in miles a vehicle travels on one UK gallon of fuel (4.546 liters). Because the UK gallon is larger than the US gallon (3.785 L), the same car shows a higher number in mpg (UK) than in mpg (US).
- History / origin
- It is built from the Imperial gallon, defined in the United Kingdom in 1824, and the statute mile. The Imperial gallon (4.546 L) is about 20% larger than the US gallon (3.785 L), so UK MPG figures run roughly 1.2 times the US figure for the same vehicle.
- Current use
- UK MPG is the traditional fuel-economy unit in the United Kingdom, still widely quoted in motoring press, used-car listings and everyday conversation, even though official ratings are now also given in liters per 100 km.
US miles per gallon to UK MPG conversion table
| US miles per gallon [mpg (US)] | UK miles per gallon [mpg (UK)] |
|---|---|
| 15 mpg (US) | 18.0142488826 mpg (UK) |
| 20 mpg (US) | 24.0189985101 mpg (UK) |
| 25 mpg (US) | 30.0237481376 mpg (UK) |
| 30 mpg (US) | 36.0284977651 mpg (UK) |
| 35 mpg (US) | 42.0332473927 mpg (UK) |
| 40 mpg (US) | 48.0379970202 mpg (UK) |
| 45 mpg (US) | 54.0427466477 mpg (UK) |
| 50 mpg (US) | 60.0474962752 mpg (UK) |
| 60 mpg (US) | 72.0569955303 mpg (UK) |
| 70 mpg (US) | 84.0664947853 mpg (UK) |
Popular US miles per gallon to UK MPG conversions
Everyday fuel-economy figures, rounded to two decimals - the kind of numbers you meet on real car specifications.
| US miles per gallon [mpg (US)] | UK miles per gallon [mpg (UK)] |
|---|---|
| 20 mpg (US) | 24.02 mpg (UK) |
| 25 mpg (US) | 30.02 mpg (UK) |
| 30 mpg (US) | 36.03 mpg (UK) |
| 35 mpg (US) | 42.03 mpg (UK) |
| 40 mpg (US) | 48.04 mpg (UK) |
| 45 mpg (US) | 54.04 mpg (UK) |
| 50 mpg (US) | 60.05 mpg (UK) |
| 55 mpg (US) | 66.05 mpg (UK) |
| 60 mpg (US) | 72.06 mpg (UK) |
| 70 mpg (US) | 84.07 mpg (UK) |
How to convert MPG (US) to MPG (UK)
To convert US MPG to UK MPG, multiply the US MPG value by 1.20094993. Both numbers describe the same fuel economy - they differ only because the gallon is defined differently - so the conversion is a single multiplication. For example, 30 mpg (US) = 30 × 1.20094993 = 36.03 mpg (UK).
The factor 1.20094993 is simply the ratio of the UK (Imperial) gallon (4.546 liters) to the US gallon (3.785 liters). The reverse conversion uses its inverse:
mpg (UK) = mpg (US) × 1.20094993
mpg (US) = mpg (UK) × 0.83267418
Example. A car rated at 40 mpg (US) does 40 × 1.20094993 = 48.04 mpg (UK), while a smaller 25 mpg (US) is 25 × 1.20094993 = 30.02 mpg (UK).
When you need to convert MPG (US) to MPG (UK)
Drivers and buyers move between US and UK miles per gallon whenever an American figure has to be read in Imperial terms. Common cases:
- Reading a US-market EPA MPG rating as a familiar UK MPG number.
- Comparing an American review's MPG claim against figures in the UK motoring press.
- Working out how a US car's economy looks in Imperial gallons before importing it.
- Translating a fuel-economy figure quoted with the US gallon (3.785 L) into the UK gallon (4.546 L).
- Cross-checking why the same car shows two different MPG numbers on either side of the Atlantic.
Frequently asked questions
How do I convert US miles per gallon to UK miles per gallon?
Multiply the US MPG value by 1.20094993. For example, 30 mpg (US) equals 30 × 1.20094993 = 36.03 mpg (UK). The UK figure is always larger because the Imperial gallon is bigger than the US gallon.
What is 30 mpg (US) in mpg (UK)?
30 mpg (US) is about 36.03 mpg (UK), found by multiplying 30 by 1.20094993. The same car simply covers more miles per Imperial gallon than per US gallon.
What is the mpg (US) to mpg (UK) formula?
The formula is mpg (UK) = mpg (US) × 1.20094993. Both figures measure the same fuel economy, so the conversion is a single multiplication; to go back you multiply mpg (UK) by 0.83267418.
Is this the US or UK gallon?
This page converts between the two. The US gallon is 3.785 liters and the UK (Imperial) gallon is 4.546 liters, so a UK MPG figure is always larger than the US MPG figure for the same car.
What is a good mpg (US) figure in mpg (UK)?
Around 40 mpg (US), about 48.04 mpg (UK), is efficient for a modern petrol car. 25 mpg (US) is roughly 30.02 mpg (UK), an average figure, while under 20 mpg (US) is thirsty.
How do I convert mpg (UK) back to mpg (US)?
Multiply the UK MPG value by 0.83267418, or use our mpg (UK) to mpg (US) converter. For example, 50 mpg (UK) is 50 × 0.83267418 = 41.63 mpg (US).
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