ACCURATE CONVERSION
US gallons to US fluid ounces Converter
Convert US gallons (gal) to US fluid ounces (fl oz) with a standards-based formula.
From
To
How to convert US gallons to US fluid ounces
Enter a value in the converter above. The result updates immediately using the relationship below.
FORMULA1 US gallon = 128 US fluid ounces
US gallons to US fluid ounces conversion table
| US gallons (gal) | US fluid ounces (fl oz) |
|---|---|
| 1 | 128 |
| 5 | 640 |
| 10 | 1,280 |
| 20 | 2,560 |
| 50 | 6,400 |
| 100 | 12,800 |
Common values
For a quick estimate, multiply by the factor above. Use more decimal places when technical work requires additional precision.
Frequently asked questions
How many US fluid ounces are in one US gallon?
One US gallon equals 128 US fluid ounces.
How do you convert US gallons to US fluid ounces?
Multiply the US gallon value by 128.
Can I convert US fluid ounces back to US gallons?
Yes. One US fluid ounce equals 0.0078125 US gallons; you can also use the swap button.