Imperial Gallons to US Gallons Converter
1 imperial gallon ≈ 1.20094993 US gallons
About 17% smaller than the imperial gallon used in the UK.
1 imperial gallon equals 1.20095 US gallons
How to convert imperial gallons to US 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.
gal = imp gal × 1.200949926One imperial gallon is 1.200949926 US gallons, so a single multiplication converts any value.
12.0095 gal ≈ 10 × 1.200949926About 17% smaller than the imperial gallon used in the UK.
Imperial gallons to US gallons conversion table
Common values in imperial gallons, converted to US gallons.
| Imperial gallons (imp gal) | US gallons (gal) |
|---|---|
| 1 | 1.2009499 |
| 2 | 2.4018999 |
| 3 | 3.6028498 |
| 4 | 4.8037997 |
| 5 | 6.0047496 |
| 10 | 12.009499 |
| 20 | 24.018999 |
| 25 | 30.023748 |
| 50 | 60.047496 |
| 100 | 120.09499 |
| 250 | 300.23748 |
| 500 | 600.47496 |
| 1,000 | 1,200.9499 |
About these units
imperial gallonimp gal
The UK gallon: exactly 4.54609 litres.
Reference: UK Weights and Measures Act 1985.
US gallongal
The US liquid gallon: exactly 231 cubic inches, or 3.785411784 litres.
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.