Miles per imperial gallon to miles per US gallon
Type a value in miles per imperial gallon to see it in miles per US gallon straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the miles per imperial gallon box.
- Read the result in miles per US gallon as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mpg (US) = mpg (UK) × 0.8326741846
Multiply the value in miles per imperial gallon by 0.8326741846 to get miles per US gallon.
Example
To convert 25 mpg (UK) to miles per US gallon: 25 × 0.8326741846 = 20.8169 mpg (US).
Conversion table
| Miles per imperial gallon (mpg (UK)) | Miles per US gallon (mpg (US)) |
|---|---|
| 1 | 0.832674 |
| 2 | 1.66535 |
| 3 | 2.49802 |
| 5 | 4.16337 |
| 10 | 8.32674 |
| 20 | 16.6535 |
| 25 | 20.8169 |
| 50 | 41.6337 |
| 100 | 83.2674 |
| 250 | 208.169 |
| 500 | 416.337 |
| 1,000 | 832.674 |
About the units
- Mile per imperial gallon
- Miles per imperial gallon of 4.54609 liters, used in the United Kingdom. It reads higher than US mpg for the same car because the gallon is larger.
- Mile per US gallon
- Miles traveled on one US gallon of 3.785411784 liters, the standard in the United States. One mile is exactly 1.609344 km.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many miles per US gallon are in one mile per imperial gallon?
1 mpg (UK) = 0.832674 mpg (US) exactly.
How do I convert miles per imperial gallon to miles per US gallon?
Use mpg (US) = mpg (UK) × 0.8326741846. For example, 25 mpg (UK) = 20.8169 mpg (US).
How many miles per imperial gallon are in one mile per US gallon?
1 mpg (US) = 1.20095 mpg (UK).
Why is mpg to L/100 km not a simple multiplication?
The units are reciprocal: one is distance per fuel, the other fuel per distance. You divide about 235.215 by the US mpg value, so 30 mpg is about 7.84 L/100 km.
Why do US and UK mpg differ?
The imperial gallon is 4.54609 L and the US gallon is 3.785411784 L, so the same car shows about 20% more miles per gallon in UK figures.