Imperial Gallons to US Fluid Ounces Converter
1 imperial gallon ≈ 153.72159 US fluid ounces
A unit of volume, unrelated to the ounce of mass.
1 imperial gallon equals 153.722 US fluid ounces
How to convert imperial gallons to US fluid ounces
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.
fl oz = imp gal × 153.7215905One imperial gallon is 153.7215905 US fluid ounces, so a single multiplication converts any value.
1,537.22 fl oz ≈ 10 × 153.7215905A unit of volume, unrelated to the ounce of mass.
Imperial gallons to US fluid ounces conversion table
Common values in imperial gallons, converted to US fluid ounces.
| Imperial gallons (imp gal) | US fluid ounces (fl oz) |
|---|---|
| 1 | 153.72159 |
| 2 | 307.44318 |
| 3 | 461.16477 |
| 4 | 614.88636 |
| 5 | 768.60795 |
| 10 | 1,537.2159 |
| 20 | 3,074.4318 |
| 25 | 3,843.0398 |
| 50 | 7,686.0795 |
| 100 | 15,372.159 |
| 250 | 38,430.398 |
| 500 | 76,860.795 |
| 1,000 | 153,721.59 |
About these units
imperial gallonimp gal
The UK gallon: exactly 4.54609 litres.
Reference: UK Weights and Measures Act 1985.
US fluid ouncefl oz
One 128th of a US gallon: about 29.57 mL.
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.