How many cups of confectioner’s sugar are in one pound? How many cups is 1 pound of confectioner’s sugar? The correct answer is that 1 pound of confectioner’s sugar is 3.54 ( 3.1/2) US cups (*).
3 1/2 cups Powdered sugar right out of the box or the plastic bag weighs 4 1/2 ounces per cup, so a 1-pound box (or 16 ounces) contains about 3 1/2 cups of powdered sugar. If a recipe calls for sifted powdered sugar, weigh out 4 ounces of sifted powdered sugar to equal 1 dry measuring cup.