There are 128 fluid ounces in 1 gallon. It’s important to know the different liquid measurement conversion factors that relate ounces, quarts, cups and gallons.

www.reference.com/article/many-ounces-gallon-60925159e39aa012

There are 128 fluid ounces in one gallon of water in the system of measurement used by the United States. By definition, a fluid ounce is 1/16 of a pint, and there are eight pints in a gallon.

www.reference.com/science/many-ounces-water-make-gallon-5376186608e463f0

Half of a US gallon holds exactly 64 US fluid ounces. A gallon can also hold 4 US quarts, 8 US pints or 16 US cups. Eight US fl oz make a US customary cup. In the British imperial system of measurement, there are exactl...

www.reference.com/science/many-gallons-64-fluid-ounces-equal-58ca4e953804f7c8

There are 64 fluid ounces in a half gallon. Both measurements are units of volume in the imperial system, widely used in the United States for cooking and other tasks.

www.reference.com/article/many-ounces-half-gallon-bc39fa492e1484a

There are 128 fluid ounces in one gallon of water in the system of measurement used by the United States. By definition, a fluid ounce is 1/16 of a pint, and there are eight pints in a gallon.

www.reference.com/science/many-ounces-water-make-gallon-5376186608e463f0

There are 4 quarts in 1 U.S. gallon. In international locations where the liter is used as the standard measurement, approximately 4 liters equal 1 U.S. gallon.

www.reference.com/article/many-quarts-one-gallon-19808d1b152f59b3

There are four quarts in a gallon, assuming that one is using U.S. quarts and U.S. gallons. However, the ratio varies if using non-US units of measurement.

www.reference.com/article/many-quarts-gallon-26314716ea214748