US Gallons to UK Gallons Converter
Convert US gallons (gal) to UK gallons (UK gal) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
US Gallons to UK Gallons formula
UK gal = gal × 0.83267384
1 US gallon = 0.8327 UK gallons · 1 UK gallon = 1.2 US gallons
To convert US gallons to UK gallons, multiply the value by 0.83267384. For example, 10 gal:
UK gal = 10 × 0.83267384UK gal = 8.326742
So 10 gal = 8.33 UK gal.
Mental math shortcut
Quick mental estimate: multiply by 5/6. For 10 gal that gives about 8.33 UK gal — within 1% of the exact answer. Use the exact formula when precision matters.
US Gallons to UK Gallons conversion table
UK Gallons back to US Gallons
The same values converted the other way, rounded for everyday use:
| UK gallons | US gallons |
|---|---|
| 0.8327 UK gal | 1 gal |
| 4.16 UK gal | 5 gal |
| 8.33 UK gal | 10 gal |
| 12.49 UK gal | 15 gal |
| 16.65 UK gal | 20 gal |
| 41.63 UK gal | 50 gal |
| 83.27 UK gal | 100 gal |
About the units
US gallons (gal)
A US gallon is 128 US fluid ounces, exactly 3.785411784 liters. (The UK imperial gallon is 4.546 liters.)
UK gallons (UK gal)
An imperial (UK) gallon is exactly 4.54609 liters — about 20% larger than a US gallon.
Frequently asked questions
How many UK gallons are in a US gallon?
One US gallon equals 0.8327 UK gallons.
What is 10 US Gallons in UK Gallons?
10 gal = 8.33 UK gal.
How do I convert UK Gallons back to US Gallons?
Divide the UK gallons by 0.83267384. Or use the UK Gallons to US Gallons converter.