Gallons to Fluid Ounces
1 US gallon = 128 fluid ounces
Converter Calculator
1 Gallons = 128 Fluid Ounces
Explanation
Multiply gallons by 128 because one US gallon equals 128 US fluid ounces, keeping the math inside the customary system.
Use the calculator whenever you need to translate between gallons and fluid ounces for pours, menus, or inventory.
Common Conversion Values
| Gallons | Fluid Ounces |
|---|---|
| 0.5 | 64 |
| 1 | 128 |
| 2 | 256 |
| 4 | 512 |
How to use this hub
- Choose a converter family.
- If converting to/from grams from a volume unit, select an ingredient.
- For pure unit changes (volume↔volume or weight↔weight), use universal conversions.
If your conversion includes grams, you’ll choose an ingredient; otherwise you won’t.
Frequently Asked Questions
Which unit definitions are used?
It relies on the US customary Gallons and Fluid Ounces definitions so every result matches the Beverage volume standard.
When should I use this page?
Use it whenever you know gallons and want the matching fluid ounces pouring total.