MPG (US) to MPG (UK) Converter
Enter mpg (US) to get mpg (UK) instantly. Works both ways.
Higher mpg means lower L/100km. 40 US mpg = 48.038 UK mpg
How to convert US mpg to UK mpg
Fuel economy units are not simple multiples of each other. Miles per gallon measures distance per fuel, while litres per 100 km measures fuel per distance, so one is the inverse of the other. US mpg to UK mpg: multiply by 1.20095.
Reference points
- 20 MPG (US) = 24.019 MPG (UK)
- 30 MPG (US) = 36.0285 MPG (UK)
- 40 MPG (US) = 48.038 MPG (UK)
- 50 MPG (US) = 60.0475 MPG (UK)
- 60 MPG (US) = 72.057 MPG (UK)
Why the conversion is not a simple multiple
Miles per gallon measures distance per unit of fuel, while litres per 100 km measures fuel per unit of distance, so one is the inverse of the other. A US gallon is about 83.3% of a UK gallon, so the same car shows a higher number in UK mpg than in US mpg.
US mpg to UK mpg chart
| MPG (US) | MPG (UK) |
|---|---|
| 10 US mpg | 12.0095 UK mpg |
| 15 US mpg | 18.0142 UK mpg |
| 20 US mpg | 24.019 UK mpg |
| 25 US mpg | 30.0237 UK mpg |
| 30 US mpg | 36.0285 UK mpg |
| 35 US mpg | 42.0332 UK mpg |
| 40 US mpg | 48.038 UK mpg |
| 45 US mpg | 54.0427 UK mpg |
| 50 US mpg | 60.0475 UK mpg |
| 55 US mpg | 66.0522 UK mpg |
| 60 US mpg | 72.057 UK mpg |
More fuel economy conversions
Frequently asked questions
Why does a higher number mean different things in MPG (US) and MPG (UK)?
Miles per gallon rises as a car gets more efficient, while litres per 100 km falls, because one is distance per fuel and the other is fuel per distance.
What is 40 in MPG (UK)?
40 MPG (US) = 48.038 MPG (UK).