Convert US fluid ounces to US gallons
1 US fluid ounce = 0.0078125 US gallons · gal = fl oz ÷ 128
When you need this conversion
This conversion goes from US fluid ounces, used for drinks and recipe liquids, to US gallons, the fuel and liquid volume unit in the US. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
US fluid ounces to US gallons conversion table
| US fluid ounces (fl oz) | US gallons (gal) |
|---|---|
| 1 fl oz | 0.0078125 gal |
| 2 fl oz | 0.015625 gal |
| 3 fl oz | 0.023437 gal |
| 5 fl oz | 0.039063 gal |
| 10 fl oz | 0.078125 gal |
| 15 fl oz | 0.117188 gal |
| 20 fl oz | 0.15625 gal |
| 25 fl oz | 0.195313 gal |
| 50 fl oz | 0.390625 gal |
| 75 fl oz | 0.585938 gal |
| 100 fl oz | 0.78125 gal |
| 250 fl oz | 1.9531 gal |
| 500 fl oz | 3.9063 gal |
| 1,000 fl oz | 7.8125 gal |
The formula
gal = fl oz ÷ 128Because both units measure volume, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
US gallons to US fluid ounces →Related volume conversions
- Liters to US gallons
- US fluid ounces to milliliters
- Milliliters to US cups
- Milliliters to US fluid ounces
- Liters to cubic meters
- Cubic meters to liters
- Cubic meters to cubic feet
- Cubic feet to cubic meters
- US gallons to liters
- US cups to milliliters
- Milliliters to US gallons
- Cubic meters to US gallons
Frequently asked questions
- How many US gallons are in a US fluid ounce?
- There are 0.0078125 US gallons in 1 US fluid ounce. The formula is gal = fl oz ÷ 128.
- How do you convert US fluid ounces to US gallons?
- Use the formula gal = fl oz ÷ 128. For example, 10 US fluid ounces equals 0.078125 US gallons.
- Is the US fluid ounces to US gallons conversion exact?
- Yes. US fluid ounces and US gallons are both units of volume, related by an exact defined factor. Displayed results are rounded for readability.
- What is fl oz short for?
- fl oz is the standard symbol for US fluid ounce. gal is the symbol for US gallon.