Table of content
gallon US to gallon UK – How to convert gal US to gal UK
The conversion from US gallons to UK gallons highlights the differences between two measurement traditions. Both are still used for fuel, beverages, and trade, but they are not equal in size. Being able to switch between them helps prevent mix-ups when comparing recipes, car mileage, or import/export records.
What is a gallon US (gal US)?
The US gallon equals 3.78541 liters. It is commonly used in the United States for fuel, milk, and other liquids.
What is a gallon UK (gal UK)?
The UK gallon, also known as the imperial gallon, equals 4.54609 liters. It is still used in parts of the UK and Commonwealth countries, especially for fuel efficiency ratings.
Conversion formula – gallon US to gallon UK
Because both gallons are defined in liters, the relationship between them is precise.
The base equivalence is:1 gal US = 0.832674 gal UK
To convert US gallons to UK gallons:1 gallon US = gallon UK × 0.832674
Examples:
10 gal US ≈ 8.33 gal UK
For quick conversions beyond gallons, Jetcalculator’s Volume Converter and wide set of Conversion Tools let you move easily between imperial, US customary, and metric units.
Do you know?
-
In fuel economy: A UK car rated at 40 mpg (imperial) actually uses fewer liters per 100 km than a US car at 40 mpg (US) because the gallons differ.
-
In pubs vs. diners: Beer in the UK was traditionally measured in imperial gallons, while American diners sold milk by the US gallon. Same word, different size.
-
In aviation: Fuel calculations for international flights sometimes require converting between US and UK gallons before converting to liters or kilograms.
Gallons across the Atlantic
This conversion shows up most clearly in fuel efficiency. American drivers calculate mileage in US mpg, while British drivers use imperial mpg. The numbers may look similar but mean very different things — a car rated at 30 mpg US would be close to 36 mpg UK.
Trade and culture reflect the same difference. Recipes, brewery records, and transport documents often require conversions between the two gallons to avoid confusion.
Bridging the gallon divide
The formula 1 gal US = 0.832674 gal UK reminds us that the same word can mean two different things depending on where you are. For everyday life, this could mean comparing milk cartons. For global trade, it can decide how fuel costs or liquid shipments are calculated.
By converting between US and UK gallons, you keep both traditions clear while ensuring measurements stay consistent worldwide.
