Convert gallons to fluid ounces and fluid ounces to gallons instantly. Bidirectional volume converter with formula and common values.
To convert gallons to fluid ounces, multiply by 128. One US gallon contains 128 US fluid ounces, based on the chain of subunits: 4 quarts, 2 pints per quart, 2 cups per pint, 8 fl oz per cup.
| Gallons | Fluid Ounces |
|---|---|
| 0.25 | 32 |
| 0.5 | 64 |
| 1.5 | 192 |
| 2 | 256 |
| 3 | 384 |
| 5 | 640 |
| 7.5 | 960 |
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One US gallon equals exactly 128 US fluid ounces.
Multiply the number of gallons by 128. For example, 2 gallons × 128 = 256 fl oz.
A half gallon contains 64 fluid ounces.
A gallon has 4 quarts, each quart has 2 pints, each pint has 2 cups, and each cup has 8 fl oz. So 4 × 2 × 2 × 8 = 128.