Fluid Ounces to Gallons
Convert fluid ounces (fl oz) to gallons (gal). Type in either box; the other updates as you go.
How to convert fluid ounces to gallons
To convert fluid ounces to gallons, divide the number of fluid ounces by 128.
Example
Convert 5 fluid ounces to gallons:
Fluid Ounce to gallon conversion chart
| Fluid Ounces (fl oz) | Gallons (gal) |
|---|---|
| 1 fl oz | 0.0078125 gal |
| 2 fl oz | 0.015625 gal |
| 3 fl oz | 0.0234375 gal |
| 4 fl oz | 0.03125 gal |
| 5 fl oz | 0.0390625 gal |
| 6 fl oz | 0.046875 gal |
| 7 fl oz | 0.0546875 gal |
| 8 fl oz | 0.0625 gal |
| 9 fl oz | 0.0703125 gal |
| 10 fl oz | 0.078125 gal |
| 12 fl oz | 0.09375 gal |
| 15 fl oz | 0.1171875 gal |
| 20 fl oz | 0.15625 gal |
| 25 fl oz | 0.1953125 gal |
| 30 fl oz | 0.234375 gal |
| 40 fl oz | 0.3125 gal |
| 50 fl oz | 0.390625 gal |
| 60 fl oz | 0.46875 gal |
| 70 fl oz | 0.546875 gal |
| 75 fl oz | 0.5859375 gal |
| 80 fl oz | 0.625 gal |
| 90 fl oz | 0.703125 gal |
| 100 fl oz | 0.78125 gal |
| 150 fl oz | 1.171875 gal |
| 200 fl oz | 1.5625 gal |
| 250 fl oz | 1.953125 gal |
| 500 fl oz | 3.90625 gal |
| 1,000 fl oz | 7.8125 gal |
Going the other way? See the gallons to fluid ounces chart.
About the units
Fluid Ounce (fl oz)
A US fluid ounce is 1/128 of a US gallon, about 29.57 milliliters. It measures liquid volume, not weight.
Gallon (gal)
A US gallon is 231 cubic inches, about 3.785 liters. It is the unit for fuel and milk in the US. The imperial gallon is about 20% larger.
Frequently asked questions
How many gallons are in a fluid ounce?
There are 0.0078125 gallons in a fluid ounce.
How many fluid ounces are in a gallon?
There are 128 fluid ounces in a gallon.
How do you convert fluid ounces to gallons?
To convert fluid ounces to gallons, divide the number of fluid ounces by 128.
What is 5 fluid ounces in gallons?
5 fluid ounces equals 0.0390625 gallons.
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