A US customary cup contains 8 US fluid ounces.
How Many Fluid Ounces Are in a Cup: explained
Half a cup is 4 fluid ounces; a quarter cup is 2.
One cup is about 236.6 milliliters.
Useful reference
US kitchen measures use 1 cup = 16 tablespoons = 48 teaspoons = 8 fluid ounces. Weight ounces are different: the weight of a cup of an ingredient varies by its density.
When the answer can differ
Fluid ounces measure volume; ounces on a scale measure mass.
Common questions
What should I remember?
A US customary cup contains 8 US fluid ounces.
What is an easy mistake to avoid?
Fluid ounces measure volume; ounces on a scale measure mass.
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