Powdered sugar is granulated sugar, ground into a fine powder with a small amount of cornstarch added to prevent the sugar from clumping. Powdered sugar contains no vitamins or minerals, however, it does contain high levels of calories per measure.
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According to the U.S. Department of Agriculture nutrient database, there are 467 calories within a 1-cup measure of unsifted powdered sugar. Of that amount, carbohydrates make up the entire amount. Proteins and fats contribute no calories to powdered sugar.
Total Caloric Intake
A 1-cup measure of powdered sugar can deliver nearly 25 percent of the recommended daily caloric intake for the average adult. A 2000 calorie per day diet is used to calculate this percentage.
The same quantity of powdered sugar weighs 120 g, states the USDA, and consists of exactly 120 g of carbohydrates. There are no proteins, fats, other nutrients or water in powdered sugar.