US Gallons to Imperial Gallons Converter
1 US gallon ≈ 0.832674185 imperial gallons
About 17% smaller than the imperial gallon used in the UK.
1 US gallon equals 0.832674 imperial gallons
How to convert US gallons to imperial gallons
Choose the named US, Imperial or metric unit before converting a recipe or container size. A US liquid gallon is 3.785411784 L; an Imperial gallon is 4.54609 L. Volume alone cannot give ingredient mass without density.
imp gal = gal × 0.8326741846One US gallon is 0.8326741846 imperial gallons, so a single multiplication converts any value.
8.32674 imp gal ≈ 10 × 0.8326741846About 17% smaller than the imperial gallon used in the UK.
US gallons to imperial gallons conversion table
Common values in US gallons, converted to imperial gallons.
| US gallons (gal) | Imperial gallons (imp gal) |
|---|---|
| 1 | 0.83267418 |
| 2 | 1.6653484 |
| 3 | 2.4980226 |
| 4 | 3.3306967 |
| 5 | 4.1633709 |
| 10 | 8.3267418 |
| 20 | 16.653484 |
| 25 | 20.816855 |
| 50 | 41.633709 |
| 100 | 83.267418 |
| 250 | 208.16855 |
| 500 | 416.33709 |
| 1,000 | 832.67418 |
About these units
US gallongal
The US liquid gallon: exactly 231 cubic inches, or 3.785411784 litres.
imperial gallonimp gal
The UK gallon: exactly 4.54609 litres.
Reference: UK Weights and Measures Act 1985.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.