Convert MPG (UK) to MPG (US) (mpg UK to mpg)
1 mile per imperial gallon (mpg (UK)) = 0.8326741846 miles per US gallon (mpg). 1 mpg = 1.200949926 mpg (UK). Example: 15 mpg (UK) = 15 × 0.8326741846 = 12.49011277 mpg.
Also searched as miles per imperial gallon to mpg, miles per imperial gallon in mpg, miles per imperial gallon into miles per US gallon, mpg UK to mpg, mpg UK in miles per US gallon, mpg UK into mile per US gallon, mile per imperial gallon to mile per US gallon, mpg UK to miles per US gallon converter and how many miles per US gallon in a mile per imperial gallon.
1 mpg (UK) = 0.8326741846 mpg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mile per imperial gallon to mile per US gallon converter to paste a column from Excel.
How to Convert MPG (UK) to MPG (US)
- 1 mpg (UK) = 0.8326741846 mpg
- 1 mpg = 1.200949926 mpg (UK)
- Example: convert 15 mpg (UK) to mpg: 15 mpg (UK) = 15 × 0.8326741846 mpg = 12.49011277 mpg
Formula
mpg = mpg (UK) × 0.832674184629
or mpg = mpg (UK) ÷ 1.200949925505
Derivation from SI units:
- 1 mpg (UK) = 1.609344 km ÷ 4.54609 L = 0.354006189… km/L.
- 1 mpg (US) = 1.609344 km ÷ 3.785411784 L = 0.425143707… km/L.
- 1 mpg (UK) = 0.3540061899346 km/L ÷ 0.4251437074303 km/L per mpg = 0.832674184629 mpg
Both units are defined exactly, so the factor is exact. MPG (UK) definition: mile per imperial gallon; MPG (US) definition: mile per US gallon.
Worked examples
- A reading of 40 mpg (UK) converts to 33.30696739 mpg.
40 mpg (UK) × 0.8326741846 = 33.30696739 mpg - A value of 55 mpg (UK) is 45.79708015 mpg.
55 mpg (UK) × 0.8326741846 = 45.79708015 mpg
MPG (UK) to MPG (US) conversion table
| MPG (UK) | MPG (US) (mpg) |
|---|---|
| 20 mpg (UK) | 16.65348369 mpg |
| 30 mpg (UK) | 24.98022554 mpg |
| 35 mpg (UK) | 29.14359646 mpg |
| 40 mpg (UK) | 33.30696739 mpg |
| 45 mpg (UK) | 37.47033831 mpg |
| 50 mpg (UK) | 41.63370923 mpg |
| 55 mpg (UK) | 45.79708015 mpg |
| 60 mpg (UK) | 49.96045108 mpg |
| 70 mpg (UK) | 58.28719292 mpg |
| 80 mpg (UK) | 66.61393477 mpg |
Where it's used
MPG (UK) are used for UK car advertising and reviews, while miles per US gallon appear in EPA fuel economy ratings. Both measure fuel economy (distance per volume of fuel), so the conversion is a fixed factor.
MPG (UK) to other fuel economy units
| Conversion | 1 mpg (UK) equals |
|---|---|
| mile per imperial gallon to mile per US gallon | 0.8326741846 mpg |
| mile per imperial gallon to liter per 100 kilometers | 282.4809363 L/100 km |
| mile per imperial gallon to kilometer per liter | 0.3540061899 km/L |
Frequently asked questions
How many miles per US gallon are in 1 mile per imperial gallon?
1 mpg (UK) = 0.8326741846 mpg.
How do I convert miles per imperial gallon to miles per US gallon?
Multiply the value in mpg (UK) by 0.8326741846, or divide it by 1.200949926. For example, 15 mpg (UK) × 0.8326741846 = 12.49011277 mpg.
Is the mpg (UK) to mpg conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile per gallon (U.K.)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mile per gallon (U.S.)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert MPG (UK) to MPG (US) (mpg UK to mpg). Retrieved October 25, 2026, from https://scientificconverters.com/fuel-economy/miles-per-gallon-uk-to-miles-per-gallon/
IEEE
Scientific Converters, "Convert MPG (UK) to MPG (US) (mpg UK to mpg)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/fuel-economy/miles-per-gallon-uk-to-miles-per-gallon/