Hello Katt! This is actually a common confusion among many bakers. While 1 cup does equate to 8 fluid ounces, other ingredients (such as flour) do not. Flour can range quite a bit when measuring by volume, depending on the type and measuring method. A King Arthur cup of whole wheat or rye weighs about 4 ounces, this is why we feed with 1 cup of flour to 1/2 cup of water or 4 ounces each by weight. The method you choose is up to you, but we always prefer weighing. Jon@KAF

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