There are 128 fluid ounces in 1 US gallon.
There are 160 fluid ounces in 1 UK gallon.
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There are 128 fluid ounces in one US gallon.
You must mean fluid ounces (ounces are weights, fluid ounces are volumes). There are 80 fluid ounces in a UK half gallon. There are 63.999999 US fluid ounces in a US half gallon.
There are 9 fluid ounces in 1/18th of a gallon. To calculate this, you would first find how many fluid ounces are in a gallon (128 oz) and then divide by 18.
There are 128 fluid ounces in a gallon.
One fluid ounce equates to 0.0078125 gallon.