Volume · gal → fl oz
US gallons to US fluid ounces
Enter any value below to convert us gallons to us fluid ounces instantly.
To
1 gal = 128 fl oz
Conversion formula
How to convert gal to fl oz
fl oz = gal × 128
Multiply the us gallons value by 128 to get us fluid ounces. The converter keeps extra precision internally and rounds only the displayed answer.
Converting us gallons to us fluid ounces helps with cooking, fuel, containers, aquariums and liquid product specifications.
Worked example
Convert 10 gal10 gal = 1,280 fl oz
Calculated with the published formula. No estimated exchange rates or hidden rounding.
Common us gallons to us fluid ounces values
| US gallons (gal) | US fluid ounces (fl oz) |
|---|---|
| 1 gal | 128 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 |
Quick answer
How many us fluid ounces are in one us gallon?
One us gallon equals 128 fl oz.