Among three popular brands researched including Pick Up Stix, Schwan's and Chang's, the number of calories for one quart of wonton soup ranged between 420 and 720 calories per quart. This number may vary for other brands.
The source of calories also varies considerably among the 3 brands researched. For the highest calorie brand, Pick Up Stix, 90 percent of the calories were from carbohydrates and 10 percent from fat. In the middle of the total calorie range, Schwan's brand soup has a composition of 46 percent carbohydrates, 33 percent fat, and 21 percent protein. The lowest calorie soup, Chang's, is composed of 40 percent carbohydrates, and 30 percent each of fat and protein, reports How Many Calories Counter.