MPG (US) (mpg)
Miles per US gallon is the fuel economy unit on US window stickers. Because the US gallon is smaller than the imperial gallon, a US mpg figure is about 17% lower than the UK figure for the same car.
Symbol: mpg
Quantity: fuel economy (distance per volume of fuel)
SI relation: 1 mpg = 0.4251437074303 km/L (exact)
Derivation: 1 mpg (US) = 1.609344 km ÷ 3.785411784 L = 0.425143707… km/L.
Exact: yes, by definition
Typical uses
- EPA fuel economy ratings
- US car comparisons
- Converting to L/100 km for Canada
Convert miles per US gallon to other units
| Conversion | 1 mpg equals | Reverse |
|---|---|---|
| mile per US gallon to liter per 100 kilometers | 235.2145833 L/100 km | liter per 100 kilometers to mile per US gallon |
| mile per US gallon to kilometer per liter | 0.4251437074 km/L | kilometer per liter to mile per US gallon |
| mile per US gallon to mile per imperial gallon | 1.200949926 mpg (UK) | mile per imperial gallon to mile per US gallon |
Open the Fuel Economy Converter to convert any value between all units.
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.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). MPG (US) (mpg). Retrieved October 25, 2026, from https://scientificconverters.com/units/mile-per-gallon-us/
IEEE
Scientific Converters, "MPG (US) (mpg)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/mile-per-gallon-us/