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# How many ounces make a gallon?

In a US gallon... 128 ounces

Both US gallons and "Imperial" (UK) gallons contain 8 pints - but the US pint is 16 fluid ounces while the Imperial pint is 20 fluid ounces.

So if you're working in Imperial gallons the answer is 160 fluid ounces.

It's quite a big difference so worth double-checking which units you're supposed to be using!

To know the weight of a certain volume you need to know the specific gravity of the fluid. In other words: the weight of one US gallon of water is not the same as the weight of one US gallon of gasoline.

1 gallon [US, liquid] = 128 ounce [US, liquid]

1 Imperial gallon = 160 Imperial fluid ounces
128 fluid ounces = 1 gal I'm happy to help =D

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Ounces and gallons are two different units of measurement.

Ounces is a unit of mass/weight.

Gallon is a measure of liquid volume.

Depending on the liquid , be it water, oil, gasoline(petrol), ethanol (ethyl alcohol) , for one gallon of volume you will have a different mass for a different liquid, this is owing to the density of the liquid.