There are 16 ounces in a standard plastic cup. The most common plastic cups that are sold in the US are the red variety, made by the Solo Cup Company who were acquired by Dart Container in 2012.
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10 fluid ounces
Actually in a standard measuring cup it is 8 fl oz.
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A US standard cup is 8 fluid ounces(US).
An Imperial 1/4 fifth cup is 8 fluid ounces (Imp)
An Imperial half pint cup is 10 fluid ounces (Imp)
a US fluid ounce is 29.5737 ml
an Imp. fluid ounce is 28.3495 ml
A standard one cup measuring cup holds 8 ounces. There are various sizes of measuring cups from less than 1 cup to over 10 cups.
A foam cup is usually about 4 oz. There is no "standard" of foam cups, so they could be 3.5, or 4.7 , only the makers decide.