How many fluid ounces in a gallon?
There are 128 fluid ounces in a gallon. To convert gallons to fluid ounces, multiply the gallon value by 128.
For example, to find out how many fluid ounces there are in a gallon and a half, multiply 1.5 by 128, that makes 192 fluid ounces in a gallon and a half.
US gallons to fluid ounces formula
fl oz = gallon * 128
1 US Gallon = 128 US Fluid Ounces
To convert between imperial gallons and fluid ounces, please use imperial gallons to fluid ounces.
What is a Gallon?
Gallon is an imperial and United States Customary systems volume unit. 1 US gallon is equal to 128 US fluid ounces and 1 Imperial gallon is equal to 160 Imperial fluid ounces. The symbol is "gal".
- 1 US fluid gallon = 128 US fluid ounces
- 1 Imperial gallon = 160 Imperial fluid ounces
Common conversions from US gallons to fluid ounces
- 1/8 gal = 16 fl oz
- 1/4 gal = 32 fl oz
- 1/3 gal = 42.66 fl oz
- 1/2 gal = 64 fl oz
- 1 gal = 128 fl oz
- 1.5 gal = 192 fl oz
- 2 gal = 256 fl oz
- 2.5 gal = 320 fl oz
You may also use volume units conversion to convert all volume units.