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In the United States customary system:

There are 128 fluid ounces in one gallon.

So, if you're asking about the volume of water in a gallon, then it would be 128 fluid ounces. This applies to any liquid, not just water.

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by (162k points)
 
Best answer
In the United States customary system:

There are 128 fluid ounces in one gallon.

So, if you're asking about the volume of water in a gallon, then it would be 128 fluid ounces. This applies to any liquid, not just water.
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