How many ounces in a gallon?
There are three types of gallons, US Customary fluid and dry gallons and the Imperial gallon. There are two types of fluid ounces, US Customary fluid ounce and the Imperial fluid ounce. So, depending on what types of gallons and fluid ounces are used, the answer to the question of how many ounces in a gallon might be different. If you are converting from US fluid gallons to US fluid ounces, then there are 128 fluid ounces in a gallon. If the conversion is between Imperial gallons and Imperial fluid ounces, then there are 160 Imperial fluid ounces in an Imperial gallon.
In this converter page, the tables and the converter is based on the US Customary fluid gallons and the US fluid ounces which are the most commonly converted types of gallons and fluid ounces.
Here is the list of conversion factors from gallons to fluid ounces:
- 1 US fluid gallon = 128 US fluid oz
- 1 US fluid gallon = 133.2278695 Imperial fluid oz
- 1 Imperial gallon= 160 Imperial fluid oz
- 1 Imperial gallon= 153.72159 Imperial fluid oz
How to convert from gallons to fluid ounces?
To convert from gallons to fluid ounces (fl oz), multiply the gallon value by the conversion factor. For example, if converting from US fluid gallon to US fluid ounce, then multiply the gallon value by 128.
For example, to find out how many ounces in half gallon, multiply 128 by 0.5, that makes 64 ounces in half gallon.
US fluid gallons to US fluid ounces formula
US fluid ounce = US fluid gallon * 128
To convert between imperial gallons and fluid ounces, please visit imperial gallons to fluid ounces converter.
How many water bottles are there in a gallon?
1 US gallon is equal to 128 US fluid ounces. To calculate how many water bottles sized in oz can fit in gallons, multiply the number of gallons by 128 and divide by the size of the water bottle in US fluid oz.
For example, to calculate how many 16.9 oz water bottles can fit in 3 gallons, multiply 3 by 128 and divide by 16.9, that makes 22.72 water bottles of 16.9 oz can fit in 3 gallons.
Different sizes of water bottles in a gallon:
- there are 16 water bottles of 8 oz in a US gallon
- there are 10.6 water bottles of 12 oz in a US gallon
- there are 7.57 water bottles of 16.9 oz in a US gallon
- there are 6.4 water bottles of 20 oz in a US gallon
- there are 5.3 water bottles of 24 oz in a US gallon
- there are 3.78 water bottles of 33.8 oz in a US gallon
To calculate how many water bottles of different sizes can fit in gallons and view the gallons to water bottles table, please visit how many water bottles are in gallons.
What is a Gallon?
Gallon is an imperial and United States Customary systems volume unit. 1 US gallon = 128 US fluid ounces and 1 Imperial gallon = 160 Imperial fluid ounces. The symbol is "gal".
Common conversions from US gallons to ounces (fl oz)
- 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
To convert from US fluid, dry and UK gallons to UK and US fluid ounces, please visit all volume units conversion.
