US fluid ounce to US gallon Converter
Type a value — the answer appears instantly. 1 fl oz = 0.0078125 gal.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
0.0078125 US gallons
= 0.0295735 L= 29.5735 ml
equals 0.0078125 US gallonsFormula: gal = fl oz × 0.0078125
US fluid ounce to US gallon formula
gal = fl oz × 0.0078125
Convert 5 US fluid ounces to US gallons
- Start with 5 US fluid ounces.
- Multiply by the conversion factor: 5 × 0.0078125 = 0.0390625.
- So 5 fl oz = 0.0390625 gal.
US fluid ounce to US gallon conversion table
| US fluid ounces (fl oz) | US gallons (gal) |
|---|---|
| 0.01 fl oz | 0.000078125 gal |
| 0.1 fl oz | 0.00078125 gal |
| 0.25 fl oz | 0.00195313 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 |
| 15 fl oz | 0.117188 gal |
| 20 fl oz | 0.15625 gal |
| 25 fl oz | 0.195313 gal |
| 30 fl oz | 0.234375 gal |
| 40 fl oz | 0.3125 gal |
| 50 fl oz | 0.390625 gal |
| 75 fl oz | 0.585938 gal |
| 100 fl oz | 0.78125 gal |
| 250 fl oz | 1.95313 gal |
| 500 fl oz | 3.90625 gal |
| 1,000 fl oz | 7.8125 gal |
| 5,000 fl oz | 39.0625 gal |
| 10,000 fl oz | 78.125 gal |
Unit definitions
What is a US fluid ounce?
The US fluid ounce is one 128th of a US gallon, about 29.57 millilitres. It is the customary unit for beverages and liquid packaging in the United States. It is slightly larger than the imperial (UK) fluid ounce.
What is a US gallon?
The US gallon is defined as exactly 231 cubic inches, or 3.785411784 litres. It is the standard unit for fuel, milk, and large liquid quantities in the United States. It is about 20% smaller than the imperial gallon.
Frequently asked questions
How many US gallons are in one US fluid ounce?
One US fluid ounce equals 0.0078125 US gallons (1 fl oz = 0.0078125 gal).
How do I convert US fluid ounces to US gallons?
Multiply the value in US fluid ounces by 0.0078125. For example, 10 fl oz × 0.0078125 = 0.078125 gal.
Which is bigger — a US fluid ounce or a US gallon?
A US gallon is bigger: one US gallon contains 128 US fluid ounces.
Is this US fluid ounce to US gallon converter free?
Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.
Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.