US gallons to Imperial gallons Converter
Enter a value in us gallons to convert it to imperial gallons, litres.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The US gallon (3.78541 litres) and the imperial (UK) gallon (4.54609 litres) are two genuinely different volumes that happen to share a name — the imperial gallon is about 20% larger, so 1 US gallon equals roughly 0.8327 imperial gallons. The split dates to 1824, when Britain redefined its gallon based on the volume of 10 pounds of water while the US kept using the older English wine gallon.
Engineers sizing fuel tanks and water systems for equipment sold in both the US and UK/Commonwealth markets, and travelers or importers reading a car's or appliance's fuel/water capacity spec, need this conversion specifically because "gallon" alone is ambiguous without knowing which country's standard is meant.
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