US miles per gallon to imperial miles per gallon converter
Convert us miles per gallon to imperial miles per gallon with an editable calculator, worked example, formula and reference table. Check the unit definitions before you convert.
Updated · How we checkUse a decimal point, such as 2.5. Enter a number greater than zero. Check whether gallons are US or Imperial.
Formula
Worked example
Convert 30 US mpg to UK mpg:
30 US mpg ≈ 36.02849777 UK mpg
Multiply your US mpg value by the factor above. The calculator uses the full conversion factor before rounding the displayed answer.
US miles per gallon to imperial miles per gallon table
Reference values rounded to 10 significant digits. Use the converter above for other amounts.
| US miles per gallon (US mpg) | Imperial miles per gallon (UK mpg) |
|---|---|
| 0.1 | ≈ 0.1200949926 |
| 0.5 | ≈ 0.6004749628 |
| 1 | ≈ 1.200949926 |
| 2 | ≈ 2.401899851 |
| 5 | ≈ 6.004749628 |
| 10 | ≈ 12.00949926 |
| 25 | ≈ 30.02374814 |
| 50 | ≈ 60.04749628 |
| 100 | ≈ 120.0949926 |
| 1000 | ≈ 1,200.949926 |
Understanding us miles per gallon
US mpg uses the US liquid gallon of 3.785411784 liters and the international mile of 1.609344 kilometers. It must not be compared numerically with Imperial mpg without conversion.
Understanding imperial miles per gallon
Imperial mpg uses the Imperial gallon of 4.54609 liters. It is numerically higher than US mpg for the same vehicle efficiency because an Imperial gallon holds more fuel.
Precision and rounding
The calculator keeps decimal precision during the conversion. Displayed values use up to 10 significant digits; an approximation sign marks the reference results. Keep extra digits until your final measurement or purchase decision.
References
Definitions and method references. Example rates and prices on this page are editable assumptions.