Gallons (US) to Fluid ounces (US) conversion table
| Gallons (US) | Fluid ounces (US) |
|---|---|
| 1 gal | 128 fl oz |
| 2 gal | 256 fl oz |
| 5 gal | 640 fl oz |
| 10 gal | 1,280 fl oz |
| 25 gal | 3,200 fl oz |
| 50 gal | 6,400 fl oz |
| 100 gal | 12,800 fl oz |
How to convert gallons (US) to fluid ounces (US)
Fluid ounces (US) = Gallons (US) × 128. For example, 2 gal = 256 fl oz. Type a value in either box above: the other one updates instantly, both ways.
What is a gallon?
A US gallon (gal) is 128 US fluid ounces, exactly 3.785411784 liters.
What is a fluid ounce?
A US fluid ounce (fl oz) is 1/128 of a US gallon, about 29.57 mL.
How do I convert gallons (US) to fluid ounces (US)?
Use the formula Fluid ounces (US) = Gallons (US) × 128. Type a value in the gallons (US) box and the result appears instantly.
How many fluid ounces (US) are in 1 gallon?
1 gal = 128 fl oz.
Is this converter free and private?
Yes. It is free, needs no sign-up, and the calculation runs in your browser: nothing is sent to a server.
Which cups, pints and gallons does this use?
US customary units: 1 cup = 236.588 mL, 1 US gallon = 3.785 L and 1 US fluid ounce = 29.574 mL. The imperial (UK) gallon is larger, 4.546 L, and has its own converter.