One US cup is equal to 8 fluid ounces (8 OZ).
Measuring
If you cook, buy a set of dry ingredient measuring cups to accurately determine volumes. The avoirdupois "ounce" is weight, not volume.
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There are 48 ounces in six cups.
There are 80.25 cups in 642 ounces.
320 US fluid Ounces in 40 US cups. :)
There are 1.5 cups in 12 fluid ounces.
1 cup is equal to 8 ounces. 24 ounces would equal 3 cups.