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.
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