1 gallon = 128 fl oz
64 fl oz = 64/128 = 1/2 = 0.5 gallon
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AnswerIt is equal to 1/2 of a gallon, exactly!
64 oz is equal to 0.5 gallons.
One pint = 16 oz. And there are 2 pints to a quart and 4 quarts to a gallon. This gives us 16 x 2 x 4= 128 oz. per gallon. We now divide 64 by 128 giving .5 gal.64 oz. is 1/2 of a gallon.
64 US fluid ounces = 1,892.7 ml
Strangely enough, exactly sixtyfour ounces.