How to convert MPG (UK) to MPG (US)
MPG (UK) and MPG (US) are related by a formula rather than a single factor. Fuel economy conversions let you compare cars rated in different countries. Note that L/100 km is an inverse measure — lower is better.
MPG (UK) to MPG (US) conversion table
| MPG (UK) (mpg (UK)) | MPG (US) (mpg) |
|---|---|
| 3 mpg (UK) | 2.49802255389 mpg |
| 5 mpg (UK) | 4.16337092314 mpg |
| 8 mpg (UK) | 6.66139347703 mpg |
| 10 mpg (UK) | 8.32674184629 mpg |
| 15 mpg (UK) | 12.4901127694 mpg |
| 20 mpg (UK) | 16.6534836926 mpg |
| 25 mpg (UK) | 20.8168546157 mpg |
| 30 mpg (UK) | 24.9802255389 mpg |
| 40 mpg (UK) | 33.3069673852 mpg |
| 50 mpg (UK) | 41.6337092314 mpg |
About the units
MPG (UK) (mpg (UK))
Imperial miles per gallon uses the larger 4.546 L UK gallon, so UK mpg figures are higher.
MPG (US) (mpg)
US miles per gallon is miles traveled per US gallon (3.785 L) of fuel.
How to use this converter
- Type the number of MPG (UK) (mpg (UK)) in the input box.
- The result in MPG (US) appears instantly — no button needed.
- See the same value in every other fuel economy unit just below.
- Use “Swap units” to convert MPG (US) back to MPG (UK).
When you’ll use the mpg (uk) to mpg (us) conversion
Converting mpg uk to mpg comes up more often than you might expect — for example when reading European L/100 km figures, calculating running costs, or comparing a car rated abroad with one at home. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
Watch out for these mix-ups
- L/100 km goes down as efficiency improves; mpg goes up.
- UK mpg uses the larger imperial gallon, so UK figures look higher.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many MPG (US) are in one mpg (uk)?
0.832674184629 mpg corresponds to 1 mpg (UK). Because this scale uses an offset or an inverse relationship, there is no single multiplication factor — use the formula above.
How do I convert MPG (UK) to MPG (US)?
Apply the formula shown on this page, or enter your value in the converter for an instant exact answer.
What is 25 mpg (UK) in mpg?
25 mpg (UK) = 20.8168546157 mpg. Also, 10 mpg (UK) = 8.32674184629 mpg and 40 mpg (UK) = 33.3069673852 mpg.
What is the difference between a mpg (uk) and a mpg (us)?
Imperial miles per gallon uses the larger 4.546 L UK gallon, so UK mpg figures are higher. US miles per gallon is miles traveled per US gallon (3.785 L) of fuel.
Is this tool free and private?
Yes — the MPG (UK) to MPG (US) is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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