In the United States customary system of measurement, there are 8 fluid ounces in a cup.
However, it's worth noting that the measurement of a "cup" can vary depending on the context. For example, in recipes, a cup can refer to a measurement of dry ingredients or a measurement of liquid ingredients. When measuring dry ingredients, the weight of a cup can vary depending on the ingredient, as some ingredients are denser than others. Additionally, in other systems of measurement, such as the metric system, a cup is not a commonly used measurement, so it's important to confirm the specific measurement system and context when converting between ounces and cups.
