ToolNestFluid Ounces to Gallons Converter
Convert fluid ounces to gallons instantly with our free volume converter. 1 fluid ounce = 0.007812 gal — type any value below and the result updates live.
Fluid Ounces → Gallons⇄ Swap: Gallons → Fluid Ounces
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Fluid Ounces to Gallons Formula
Gallons = Fluid Ounces × 0.007812 (Fluid Ounces = Gallons × 128)
Volume conversion for cooking, fuel, and engineering — metric liters and milliliters alongside US customary gallons, quarts, pints, cups, and fluid ounces.
Fluid Ounces to Gallons Conversion Table
| Fluid Ounces | Gallons | |
|---|---|---|
| 1 fl oz | = | 0.007812 gal |
| 2 fl oz | = | 0.015625 gal |
| 5 fl oz | = | 0.039062 gal |
| 10 fl oz | = | 0.078125 gal |
| 25 fl oz | = | 0.195312 gal |
| 50 fl oz | = | 0.390625 gal |
| 100 fl oz | = | 0.78125 gal |
About Fluid Ounces and Gallons
A US fluid ounce is 1/128 of a US gallon (29.5735 ml). The unit for drink servings, bottles, and small liquid measures.
A US gallon is 128 fluid ounces (3.78541 liters) — the unit for gasoline, milk, and water heaters across America.
Frequently Asked Questions
How many gallons are in one fluid ounce?
One fluid ounce equals 0.007812 gallons. Multiply any fluid ounces value by 0.007812 to convert it.
What is the formula for converting fluid ounces to gallons?
Gallons = Fluid Ounces × 0.007812. To reverse it: fluid ounces = gallons × 128.
How do I convert gallons back to fluid ounces?
Divide the gallons value by 0.007812 (equivalently, multiply by 128). Or use our gallons-to-fluid ounces converter going the other way.
Which is bigger, a fluid ounce or a gallon?
A gallon is bigger — it takes 128 fluid ounces to make one gallon.