When measuring liquids, 1/2 cup equals 4 fluid ounces. This is based on the U.S. customary system, where 1 cup = 8 fluid ounces, so half of a cup would naturally be 4 ounces.
For dry ingredients, the weight of 4 ounces can vary depending on the ingredient’s density. For instance, 1/2 cup of flour weighs less than 1/2 cup of sugar because they have different densities.
This conversion is essential for accurate cooking and baking, ensuring you measure ingredients precisely for the best results.