128 fluid ounces equal one gallon.
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There are 128 fluid ounces in one gallon.
Cup: 8 oz Pint: 16 oz Quart: 32 oz Half-Gallon: 64 oz Gallon: 128 oz
128 fluid oz is equal to 1 gallon.
64 oz is equal to 0.5 gallons.
There are 128 ounces in a gallon.