# How Many Ounces in a Gallon of Water?

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**Created:** [August 15, 2020, 10:23pm UTC](https://howtodiscuss.com/t/how-many-ounces-in-a-gallon-of-water/13258 "2020-08-15T22:23:00Z")\
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A gallon of water contains how many ounces? There are 128 ounces in a gallon. 160 fluid ounces are equal to 1 gallon of water in the metric system. What portion of a gallon is a half? There are 64 liquid ounces in a half gallon, is the response. The half gallon has 64 fluid ounces and the full gallon has 128 fl oz.

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What Amount of Water is in a Gallon?

The Imperial measurement system is used in the United States and the United Kingdom.

the US system and British Imperial Because of their economic expansion, demographic increase, and technological advancements, these were undoubtedly the most widespread.

A latecomer to adoption, the metric system is now widely used around the world.

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