How Much Is One Cup of Flour in Grams?

Melissa Wiese/CC-BY-2.0

One cup of all-purpose flour is the equivalent to 128 grams, or 4.5 ounces. Half a cup of all-purpose flour is equal to 64 grams or 2.25 ounces, and a fourth of a cup is equal to 32 grams or 1.13 ounces. These measurements also apply to confectioners sugar.

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