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There's often a bit of number-crunching and conversion involved in baking and cooking.  If you constantly indulge in recipes that call for powdered sugar or confectioner's sugar, or you want to cater to curiosity, you may question how much powdered sugar a box holds. Knowing this will make your grocery choices for powdered sugar easier.  A 1-pound or 16-ounce box of powdered or confectioners sugar holds approximately 3.5 cups of powdered sugar.  One significant variable to consider when using powdered sugar is whether your recipe calls for the sifted or unsifted variant. If your recipe demands sifted powdered sugar, you…