A 1.55-ounce Hershey bar is about 5 3/8 inches long, 2 1/8 inches wide and a quarter of an inch thick. Metric measurements for the 43-gram bar are approximately 13.6 centimeters long, 5.5 centimeters wide and 0.5 centimeters high.
A Hershey bar contains one serving and has 210 calories, 110 of which come from its 13 grams of fat. This is about 20 percent of the recommended daily value for fat. The bar also provides 26 grams of carbohydrates and 3 grams of protein. A Hershey bar contains 8 percent of the daily value for calcium, 4 percent for dietary fiber and 2 percent for iron.