How many fluid ounces are in one cup?

Answer 1

This depends where you are. The UK cup and US cup are different sizes, as are the pint, quart, and gallon.

The English Cup (UK)

1 UK cup = 10 fluid ounces

The American Cup

1 US cup = 8 fluid ounces

(Note also that the US fluid ounce and the UK or Imperial fluid ounce are slightly different sizes.)

Answer 2

There are 8 fluid ounces in one cup.