Fluid Ounce (US) to Gallon (US) Converter
Convert Fluid Ounce (US) (fl oz) to Gallon (US) (gal) instantly. 1 fl oz = 0.007813 gal.
Volume Converter
40 units available
1 fl oz = 0.007813 gal
Formula:
gal = fl oz × 0.0078125With your value: 1 fl oz = 0.0078125 gal
How big is that?
Everyday references on a logarithmic scale, all expressed in fluid ounce (us) so you can sanity-check the result.
Other Fluid Ounce (US) to Gallon (US) conversions
Fluid Ounce (US) to Gallon (US) Conversion Table
| Fluid Ounce (US) (fl oz) | Gallon (US) (gal) |
|---|---|
| 0.5 | 0.003906 |
| 1 | 0.007813 |
| 2 | 0.015625 |
| 5 | 0.039063 |
| 10 | 0.078125 |
| 15 | 0.117188 |
| 20 | 0.15625 |
| 25 | 0.195313 |
| 50 | 0.390625 |
| 100 | 0.78125 |
| 250 | 1.953125 |
| 500 | 3.90625 |
| 1000 | 7.8125 |
Gallon (US) to Fluid Ounce (US) Conversion Table
| Gallon (US) (gal) | Fluid Ounce (US) (fl oz) |
|---|---|
| 0.5 | 64 |
| 1 | 128 |
| 2 | 256 |
| 5 | 640 |
| 10 | 1,280 |
| 15 | 1,920 |
| 20 | 2,560 |
| 25 | 3,200 |
| 50 | 6,400 |
| 100 | 12,800 |
| 250 | 32,000 |
| 500 | 64,000 |
| 1000 | 128,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Fluid Ounce (US) (fl oz)
Volume
Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Gallon (US) (gal)
Volume
The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Fluid Ounce (US) to Gallon (US)
To convert from Fluid Ounce (US) (fl oz) to Gallon (US) (gal), multiply the value by 0.0078125.
Formula: gal = fl oz × 0.0078125
Reverse: fl oz = gal × 128
Step-by-Step Example
- Start with your value in Fluid Ounce (US). For example: 5 fl oz
- Multiply by the conversion factor: 5 x 0.0078125
- The result is: 0.039063 gal
About Fluid Ounce (US)
The US fluid ounce equals approximately 29.57 mL. It is commonly used for beverage and liquid measurements.
Common uses: beverages, cooking, cocktails.
About Gallon (US)
The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.
Common uses: fuel (US), beverages, swimming pools.
Frequently Asked Questions
How many Gallon (US) are in 1 Fluid Ounce (US)?
There are exactly 0.0078125 Gallon (US) in 1 Fluid Ounce (US). This means the conversion factor from Fluid Ounce (US) to Gallon (US) is 0.0078125.
What is the formula to convert Fluid Ounce (US) to Gallon (US)?
The formula to convert Fluid Ounce (US) to Gallon (US) is: gal = fl oz × 0.0078125. For example, to convert 10 Fluid Ounce (US) to Gallon (US), you would multiply 10 by 0.0078125.
What is a Fluid Ounce (US)?
The US fluid ounce equals approximately 29.57 mL. It is commonly used for beverage and liquid measurements.
What is a Gallon (US)?
The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.
What are the common uses of Fluid Ounce (US)?
The Fluid Ounce (US) is commonly used in beverages, cooking, cocktails.
Related Volume Conversions
Cite this page
UnitConvertLab. (2026). Fluid Ounce (US) to Gallon (US) converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/fluid_ounce_us-to-gallon_us