How to convert US fluid ounces to US gallons
gal = fl oz × 0.0078125Because one US gallon equals 128 US fluid ounces, you can also divide: gal = fl oz ÷ 128.
An US fluid ounce is smaller than an US gallon: it takes 128 US fluid ounces to make one US gallon.
Worked examples
- 1 US fluid ounce1 fl oz × 0.0078125 = 0.0078125 gal
- 5 US fluid ounces5 fl oz × 0.0078125 = 0.0390625 gal
- 10 US fluid ounces10 fl oz × 0.0078125 = 0.078125 gal
- 20 US fluid ounces20 fl oz × 0.0078125 = 0.15625 gal
- 100 US fluid ounces100 fl oz × 0.0078125 = 0.78125 gal
US fluid ounces to US gallons conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| US fluid ounces (fl oz) | US gallons (gal) |
|---|---|
| 0.1 fl oz | 0.00078125 gal |
| 0.25 fl oz | 0.001953125 gal |
| 0.5 fl oz | 0.00390625 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 |
| US fluid ounces (fl oz) | US gallons (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 |
| 75 fl oz | 0.5859375 gal |
| 100 fl oz | 0.78125 gal |
| 250 fl oz | 1.953125 gal |
| 500 fl oz | 3.90625 gal |
| 1,000 fl oz | 7.8125 gal |
About the units
US fluid ounce (fl oz)
One 128th of a US gallon: 29.5735295625 mL. Beverage cans and bottles in the US are labelled in fluid ounces. One US fluid ounce equals 0.00002957352956 cubic meters (m³).
US gallon (gal)
Defined as 231 cubic inches, exactly 3.785411784 L. US fuel, milk and paint are sold by the gallon. Four quarts or 128 US fluid ounces. One US gallon equals 0.003785411784 cubic meters (m³).
Frequently asked questions
How many US gallons are in one US fluid ounce?
There are 0.0078125 US gallons in one US fluid ounce, and this value is exact by definition.
How do I convert US fluid ounces to US gallons?
Multiply the number of US fluid ounces by 0.0078125. For example, 10 fl oz × 0.0078125 = 0.078125 gal.
How many US fluid ounces are in one US gallon?
One US gallon equals 128 US fluid ounces. That is the reverse factor, 1 ÷ 0.0078125.
What is 10 US fluid ounces in US gallons?
10 fl oz = 0.078125 gal.
Is this fl oz to gal converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.