A medium sweet potato baked in the skin contains about 100 calories, with only 1 calorie from fat. A large sweet potato contains about 159 calories, while a small sweet potato contains about 60. A cup of cubed sweet potatoes contains close to 180 calories.
A medium sweet potato contains about 23 grams of carbohydrates, 3.7 of which come from dietary fiber and 9.4 of which come from sugars. It also has 2.2 grams of protein and about 0.2 grams of total fat. There are about 40 milligrams of sodium in a medium sweet potato, along with roughly 42 milligrams of calcium and 527 milligrams of potassium.