Gallons to ounces conversion factors are listed below. To find out how many ounces in a gallon, multiply by the conversion factors or use the converter.
1 Gallon [Fluid, US] = 128 Ounces [Fluid, US]
1 Gallon [Dry, US] = 148.94684 Ounces [Fluid, US]
1 Gallon [UK] = 160 Ounces [UK]
There are 128 ounces in a gallon, because from the largest to the smallest units between gallon and fl. oz, there are 4 quarts in a gallon, 2 pints in a quart, 2 cups in a pint and 8 fl. ounces in a cup, that makes 4 * 2 * 2 * 8 = 128 fl. ounces in a gallon.
For example, to find out how many ounces in a gallon and a half, multiply the gallon value by the conversion factor, that makes 1.5 gal * 128 = 192 ounces in a gallon and a half.
For US fluid gallons, there are 128 ounces in a gallon, 64 fl. oz in 1/2 gallon, 32 fl. oz in 1/4 gallon, 16 fl. oz in 1/8 gallon, 42.6 fl. oz in 1/3 gallon and 96 fl. oz in 3/4 gallon.
For UK gallons, there are 160 ounces in an imperial gallon, 80 fl. oz in 1/2 gallon, 40 fl. oz in 1/4 gallon, 20 fl. oz in 1/8 gallon, 53.3 fl. oz in 1/3 gallon and 120 fl. oz in 3/4 gallon.
Gallon is unit of volume in imperial and US customary systems. The US gallon is defined as 231 cubic inches or 8.3389 avoirdupois pounds (3.78 kg) of distilled water at its maximum density and with the barometer at 30 inches. Gallon is the largest volume unit in US customary and imperial measurement systems.
An imperial gallon is officially defined as equal in volume to 10 avoirdupois pounds (4.53 kg) of distilled water weighed at 62 degrees Fahrenheit (16.66 degrees Celsius) with barometer at 30 inches (or equal to 277.421 cubic inches). The imperial gallon is 17% larger than the US gallon. The abbreviation is "gal".
Fluid ounce is an imperial and US customary measurement system volume unit. Fluid ounce is the smallest unit of volume in imperial and US customary systems. UK fluid ounce equals to one twentieth of a pint and US fluid ounce equals to one sixteenth of a US pint. The abbreviation is "fl oz".
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