In the US customary system of measurement, there are 8 fluid ounces in a cup. This is a common unit of measure for cooking and baking recipes, as well as for measuring liquids such as water, milk, and juice.
It's worth noting that there is also a dry measurement cup, which is a volume of 1 US customary cup or 8 US fluid ounces, but is intended for measuring dry ingredients such as flour, sugar, or grains. However, the weight of a dry ingredient in a cup can vary depending on the density of the ingredient, so for precise measurements, it's often better to weigh ingredients using a kitchen scale.
