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 in a gallon and a half, multiply 1.5 by 128, that makes 192 fluid ounces in a gallon and a half.
1 Gallon = 128 Fluid Ounces
To convert imperial gallons to imperial fluid ounces, please check imperial gallons to imperial fluid ounces.
How many gallons in a fluid ounce?
As there are 128 fluid ounces in 1 gallon, to convert fluid ounces to gallons, divide the fluid ounce value by 128.
For example, to find out how many gallons is 32 fluid ounces, divide 32 by 128, that makes 0.25 gallon in 32 fluid ounces.
1 Fluid Ounce = 0.0078125 Gallon
You may also use this volume units conversion calculator to convert between US, imperial gallons and fluid ounces.
What is a Gallon?
Gallon is an imperial and United States Customary systems volume unit. 1 US fluid gallon is equal to 128 US fluid ounces and 1 Imperial gallon is equal to 160 Imperial fluid ounces. The symbol is "gal".
The US fluid gallon is defined as 231 cubic inches (3.785411784 liters), the US dry gallon is defined as 1⁄8 US bushel (4.40488377086 liters) and the imperial gallon is defined as 4.54609 liters.
Three different sizes of gallon currently in use:
- 1 US fluid gallon = 128 US fluid ounces
- 1 US dry gallon = 148.94684081 US fluid ounces
- 1 Imperial gallon = 160 Imperial fluid ounces
To convert between US and UK gallons, please check gallons conversion calculator tool.
What is a Fluid Ounce?
Fluid ounce is an imperial and United States Customary measurement system volume unit. The symbol is "fl oz".
The US fluid ounce is defined as 1⁄16 of a US fluid pint and the imperial fluid ounce is defined as 1⁄20 of an imperial pint.
Two different sizes of fluid ounes currently in use:
- 1 US fluid ounce = 0.0078125 US fluid gallon
- 1 Imperial fluid ounce = 0.00625 Imperial gallon
To convert between US and UK fluid ounces, please check fluid ounces conversion calculator tool.