Powdered sugar is usually measured in weight.
1.5 pounds = 24 ounces = 3 cups
There would be 16 ounces in a pound of anything.
There are eight ounces, by volume, in a cup. Therefore 32 ounces of powdered sugar, by volume, equals 4 cups.
There are approximately 2.5 cups in 20 ounces of powdered sugar. This is because 1 cup of powdered sugar typically weighs around 4 ounces. Therefore, to convert ounces to cups, you divide the total ounces by the weight of one cup.
16 ounces
Powdered sugar is sold in bags and boxes of many different sizes and weights. The weight is always printed on the box.
128 oz
453.592 grams
A standard box of confectioner's sugar has 16 oz.
There are two US cups in 16 ounces. That's correct in liquid measurements. One 16 oz. package of powdered sugar is about 4 cups.
1
1/4 cup 1 pound has 16 ounces, which is two cups. Each cup has 8 ounces. 4 ounces is 1/2 cup. 2 ounces is 1/4 cup.