Fluid Ounce (US) to Gallon (US)Converter
Instantly convert Fluid Ounce (US) (fl oz) to Gallon (US) (gal). Free, accurate, and easy to use.
How to Convert Fluid Ounce (US) to Gallon (US)
To convert Fluid Ounce (US) (fl oz) to Gallon (US) (gal), multiply your value by 0.0078125.
Example: 5 fl oz × 0.0078125 = 0.03906248 gal
What is a Fluid Ounce (US)?
The US fluid ounce equals approximately 29.574 milliliters, or 1/128 of a US gallon. Despite sharing a name with the mass unit ounce, it measures only volume. The UK imperial fluid ounce differs, equaling 28.413 mL (1/160 of an imperial gallon). There are 8 US fluid ounces in a cup and 128 in a gallon.
What is a Gallon (US)?
The US liquid gallon equals 128 fluid ounces, 8 pints, or approximately 3.785 liters. It is the standard unit for fuel, water, and large liquid volumes in the United States. The UK imperial gallon is larger at approximately 4.546 liters — about 20% more. The gallon difference is a common source of confusion for international recipes and fuel economy figures.
Fluid Ounce (US) to Gallon (US) Conversion Table
| Fluid Ounce (US) (fl oz) | Gallon (US) (gal) |
|---|---|
| 0.001 fl oz | 0.00000781 gal |
| 0.01 fl oz | 0.00007812 gal |
| 0.1 fl oz | 0.00078125 gal |
| 0.5 fl oz | 0.00390625 gal |
| 1 fl oz | 0.0078125 gal |
| 2 fl oz | 0.01562499 gal |
| 5 fl oz | 0.03906248 gal |
| 10 fl oz | 0.07812496 gal |
| 20 fl oz | 0.15624992 gal |
| 50 fl oz | 0.39062479 gal |
| 100 fl oz | 0.78124959 gal |
| 200 fl oz | 1.56249917 gal |
| 500 fl oz | 3.90624794 gal |
| 1000 fl oz | 7.81249587 gal |
| 5000 fl oz | 39.06247936 gal |
| 10000 fl oz | 78.12495872 gal |
| 50000 fl oz | 390.62479362 gal |
| 100000 fl oz | 781.24958723 gal |
| 1000000 fl oz | 7812.49587231 gal |
| 1000000000 fl oz | 7812495.87230974 gal |
Frequently Asked Questions
How do I convert Fluid Ounce (US) to Gallon (US)?
Multiply the Fluid Ounce (US) value by 0.0078125. Formula: gal = fl oz × 0.0078125. Example: 10 fl oz = 0.07812496 gal.
How many Gallon (US) are in one Fluid Ounce (US)?
One Fluid Ounce (US) (fl oz) equals 0.0078125 Gallon (US) (gal).
How many Fluid Ounce (US) are in one Gallon (US)?
One Gallon (US) (gal) equals 128.00006763 Fluid Ounce (US) (fl oz).
What is the exact conversion factor from Fluid Ounce (US) to Gallon (US)?
The conversion factor is 0.0078125. Multiply any fl oz value by this number to get gal. For the reverse, multiply by 128.00006763.
How do I convert Gallon (US) back to Fluid Ounce (US)?
Divide by 0.0078125, or equivalently multiply by 128.00006763. Formula: fl oz = gal ÷ 0.0078125.
Is the Fluid Ounce (US)-to-Gallon (US) conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 0.0078125 is exact and universally agreed upon.