US Fluid Ounce to US Gallon Converter
One US Fluid Ounce equals 0.0078125 US Gallon (1 fl-oz = 0.0078125 gal). Multiply a US Fluid Ounce value by 0.0078125 to get the equivalent in US Gallon. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
gal = fl-oz × 0.0078125
Multiply the US Fluid Ounce value by 0.0078125 to get the equivalent value in US Gallon.
Example Conversions
1 US Fluid Ounce (fl-oz)
0.0078125 US Gallon (gal)
5 US Fluid Ounce (fl-oz)
0.0390625 US Gallon (gal)
10 US Fluid Ounce (fl-oz)
0.078125 US Gallon (gal)
25 US Fluid Ounce (fl-oz)
0.1953125 US Gallon (gal)
100 US Fluid Ounce (fl-oz)
0.78125 US Gallon (gal)
Conversion Table
| US Fluid Ounce (fl-oz) | US Gallon (gal) |
|---|---|
| 0.1 | 0.00078125 |
| 0.5 | 0.00390625 |
| 1 | 0.0078125 |
| 2 | 0.015625 |
| 5 | 0.0390625 |
| 10 | 0.078125 |
| 25 | 0.1953125 |
| 50 | 0.390625 |
| 100 | 0.78125 |
| 250 | 1.953125 |
| 500 | 3.90625 |
| 1000 | 7.8125 |
How to Convert Manually
Use these steps to convert US Fluid Ounce values to US Gallon without the calculator.
- Write down the value in US Fluid Ounce (fl-oz) that you want to convert.
- Multiply that value by 0.0078125.
- For example, 10 US Fluid Ounce × 0.0078125 = 0.078125 US Gallon.
- Label the result as US Gallon (gal).
Relative Size Comparison
This chart shows the visual difference in size between exactly one US Fluid Ounce and one US Gallon.
About US Fluid Ounce and US Gallon
The US fluid ounce is about 29.574 milliliters, one eighth of a US cup. Beverage cans, cosmetics, and baby formula in the US are labeled in fluid ounces. The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters. US fuel prices, milk jugs, and paint cans are all per-gallon quantities. One US Fluid Ounce equals 0.0078125 US Gallon (1 fl-oz = 0.0078125 gal). US Fluid Ounce to US Gallon conversion comes up most often in US beverage can and bottle sizes and in cosmetics labeling in the US, typically when figures need restating for US fuel prices.
Precision and Rounding: US and imperial volume units share names but differ in size (an imperial gallon is about 20% larger than a US gallon), so confirm which system a figure uses before converting. Kitchen work tolerates rounding to the nearest milliliter or quarter-teaspoon; fuel, chemistry, and brewing need three or more decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 US Fluid Ounce equals 0.1171875 US Gallon.
15 fl-oz × 0.0078125 = 0.1171875 gal
FAQ
How do I convert US Fluid Ounce to US Gallon?
Multiply the US Fluid Ounce value by 0.0078125 to get the equivalent value in US Gallon.
What is the formula for US Fluid Ounce to US Gallon?
The formula is gal = fl-oz × 0.0078125.
How many US Gallon are in 1 US Fluid Ounce?
1 US Fluid Ounce equals 0.0078125 US Gallon.
Can I convert US Gallon back to US Fluid Ounce?
Yes. 1 US Gallon equals 128 US Fluid Ounce, and the related converter can reverse the calculation.
What are common names for US Fluid Ounce and US Gallon?
US Fluid Ounce is shown as fl-oz and may also be searched as fluid ounces, fl oz, us fl oz. US Gallon is shown as gal and may also be searched as gallons, us gallons.
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