The weight of one cup of flour can vary depending on the type of flour and how it is measured. However, as a general guideline, one cup of all-purpose flour typically weighs around 125 grams or approximately 4.5 to 5 ounces in weight. Keep in mind that the weight can be influenced by factors such as the method of measurement (scooping or spooning) and the density of the flour. For more accurate and consistent results, it is recommended to weigh ingredients using a kitchen scale rather than relying solely on volume measurements like cups. This is particularly important for baking, where precise measurements can greatly affect the outcome of the recipe.