Question and Answer How many ounces in a cup? June 26, 2022 796 FacebookTwitterPinterestWhatsApp Answer: There are 8 fluid ounces in a cup. This is based on the U.S. customary units of measurement. In the metric system, there are 236.6 milliliters (mL) in a cup, so a cup contains about 8 fluid ounces worth of liquid.