How to convert MPG (US) to MPG (UK)
MPG (US) and MPG (UK) 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 (US) to MPG (UK) conversion table
| MPG (US) (mpg) | MPG (UK) (mpg (UK)) |
|---|---|
| 3 mpg | 3.60284977651 mpg (UK) |
| 5 mpg | 6.00474962752 mpg (UK) |
| 8 mpg | 9.60759940404 mpg (UK) |
| 10 mpg | 12.009499255 mpg (UK) |
| 15 mpg | 18.0142488826 mpg (UK) |
| 20 mpg | 24.0189985101 mpg (UK) |
| 25 mpg | 30.0237481376 mpg (UK) |
| 30 mpg | 36.0284977651 mpg (UK) |
| 40 mpg | 48.0379970202 mpg (UK) |
| 50 mpg | 60.0474962752 mpg (UK) |
About the units
MPG (US) (mpg)
US miles per gallon is miles traveled per US gallon (3.785 L) of fuel.
MPG (UK) (mpg (UK))
Imperial miles per gallon uses the larger 4.546 L UK gallon, so UK mpg figures are higher.
How to use this converter
- Type the number of MPG (US) (mpg) in the input box.
- The result in MPG (UK) appears instantly — no button needed.
- See the same value in every other fuel economy unit just below.
- Use “Swap units” to convert MPG (UK) back to MPG (US).
When you’ll use the mpg (us) to mpg (uk) conversion
Converting mpg to mpg uk comes up more often than you might expect — for example when reading European L/100 km figures, estimating trip fuel use, or choosing between two vehicles. 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 (UK) are in one mpg (us)?
1.2009499255 mpg (UK) corresponds to 1 mpg. 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 (US) to MPG (UK)?
Apply the formula shown on this page, or enter your value in the converter for an instant exact answer.
What is 25 mpg in mpg (UK)?
25 mpg = 30.0237481376 mpg (UK). Also, 10 mpg = 12.009499255 mpg (UK) and 40 mpg = 48.0379970202 mpg (UK).
What is the difference between a mpg (us) and a mpg (uk)?
US miles per gallon is miles traveled per US gallon (3.785 L) of fuel. Imperial miles per gallon uses the larger 4.546 L UK gallon, so UK mpg figures are higher.
Is this tool free and private?
Yes — the MPG (US) to MPG (UK) 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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