Live Converter
Convert Liquid Measurement Online
Enter your value above to convert US gallons to UK gallons or vice versa.
Real-World Examples
The Uses of US Gallons to UK Gallons Conversion
The US gallon and the UK imperial gallon diverged centuries ago and now differ by about 20%, so any recipe, fuel figure, or container size needs to specify which one is meant.
Reading British Recipes and Fuel Economy Figures
Americans following a British recipe or comparing a UK car's miles-per-gallon rating need this conversion, since both numbers are quietly based on the larger imperial gallon.
International Shipping and Container Specifications
Logistics companies handling shipments specified in UK gallons by an overseas supplier convert those figures into US gallons to match American storage and transport equipment.
Comparing Fuel and Beverage Prices Across Countries
Travelers and researchers comparing the price of fuel or beverages sold by the gallon in the US versus the UK use this conversion to make sure they're comparing like-for-like quantities.
Quick Reference
Comprehensive Conversion Table
Our quick table gives you instant results, so you don't have to calculate these common values manually.
| Conversion | Formula | Result (UK gal) |
|---|---|---|
| 1 US gal to UK gal | 1 × 0.8326741846289888 | 0.8327 UK gal |
| 2 US gal to UK gal | 2 × 0.8326741846289888 | 1.6653 UK gal |
| 3 US gal to UK gal | 3 × 0.8326741846289888 | 2.4980 UK gal |
| 5 US gal to UK gal | 5 × 0.8326741846289888 | 4.1634 UK gal |
| 10 US gal to UK gal | 10 × 0.8326741846289888 | 8.3267 UK gal |
| 20 US gal to UK gal | 20 × 0.8326741846289888 | 16.6535 UK gal |
| 50 US gal to UK gal | 50 × 0.8326741846289888 | 41.6337 UK gal |
| 100 US gal to UK gal | 100 × 0.8326741846289888 | 83.2674 UK gal |
| 500 US gal to UK gal | 500 × 0.8326741846289888 | 416.3371 UK gal |
Got Questions?
Frequently Asked Questions
How many UK gallons are in 1 US gallon?
1 US gallon equals approximately 0.833 UK gallons, since the UK imperial gallon is the larger of the two units.
Why are the US and UK gallons different sizes?
The US kept an older English wine gallon definition after independence, while Britain standardized a larger imperial gallon in 1824, and the two never reconciled.
Which countries use the UK imperial gallon today?
The UK still uses it informally for some fuel economy references, along with a handful of other countries with historical ties to British imperial measurements.
Is this based on the US gallon?
Yes, this converter starts from the US liquid gallon (3.785411784 liters) as the "from" unit, converting into the larger UK imperial gallon (4.54609 liters).