1 mpg (UK) equals 0.832674 mpg (US). To convert mpg (UK) to mpg (US), multiply the value by 0.832674; divide by 0.832674 to convert back. Enter any number above and the result appears instantly — free and entirely in your browser.
How do you convert mpg (UK) to mpg (US)?
The conversion formula is mpg (US) = mpg (UK) × 0.832674. The conversion factor is fixed by definition, so the result is always exact.
mpg (UK) to mpg (US) conversion table
| mpg (UK) | mpg (US) |
|---|---|
| 25 mpg (UK) | 20.8169 mpg (US) |
| 30 mpg (UK) | 24.9802 mpg (US) |
| 35 mpg (UK) | 29.1436 mpg (US) |
| 40 mpg (UK) | 33.307 mpg (US) |
| 50 mpg (UK) | 41.6337 mpg (US) |
| 60 mpg (UK) | 49.9605 mpg (US) |
What is mpg (UK) (mpg (UK))?
Miles per gallon (UK) uses the imperial gallon of 4.54609 litres, about 20% larger than the US gallon. The same car therefore scores roughly 20% more mpg in British figures than in American ones.
What is mpg (US) (mpg (US))?
Miles per gallon (US) states how far a car travels on one US gallon of 3.785411784 litres. Higher is better. Because it measures distance per fuel, it moves in the opposite direction to L/100 km.
Why convert mpg (UK) to mpg (US)?
Europe states fuel use as consumption (litres per 100 km, lower is better), the US and UK as economy (miles per gallon, higher is better), and much of Asia as kilometres per litre. The two families are inverses of each other, which is why a car advert from abroad is so hard to read at a glance.
The US gallon is defined as exactly 231 cubic inches, or 3.785411784 litres; the imperial gallon is exactly 4.54609 litres (UK Weights and Measures Act 1985). That gives two different constants: mpg (US) = 235.2146 ÷ (L/100 km) and mpg (UK) = 282.4809 ÷ (L/100 km).
What can the converter not tell you?
The converter turns one figure into another; it does not measure anything. Factory values follow the WLTP test cycle and regularly sit below what a car uses on the road, and driving style, load, tyres and temperature shift the result far more than any conversion does. A value of 0 has no counterpart either: a car that burns nothing would travel infinitely far, so the field stays blank instead of showing a number.
How to convert mpg (UK) to mpg (US)
- Enter the value in mpg (UK) into the left field of the converter.
- Read the result in mpg (US) instantly in the right field — it updates automatically.
- Use the swap button to reverse the direction (mpg (US) to mpg (UK)).
The converter runs entirely in your browser: no uploads, no queue, no limits. You can even use it offline.