3 1/2 cups Powdered sugar directly from the box or plastic bag weighs 4 1/2 ounces per cup; therefore, a 1-pound box (or 16 ounces) provides approximately 3 1/2 cups of powdered sugar.
How many cups of sugar are in a pound of sugar?
Ounces of sugar per pound One pound of granulated sugar is about equivalent to two cups.