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 powder do one pound contain?
Final Reflections – How many cups of powdered sugar are in one pound? One pound is equivalent to three and a half to four cups of unsifted powdered sugar or four and a half cups of sifted powdered sugar. Simply scoop some powdered sugar and level the top with the back of a knife to measure it.