Carbohydrates in baked sweet potato. 1  37 carbohydrates in a large baked sweet potato (6 oz or 170g). 2  24 carbohydrates in a medium baked sweet potato (4 oz or 114g). 3  12.4 carbohydrates in a small baked sweet potato (2 oz or 58g).arbohydrates in baked sweet potato. 1  37 carbohydrates in a large baked sweet potato (6 oz or 170g). 2  24 carbohydrates in a medium baked sweet potato (4 oz or 114g). 3  12.4 carbohydrates in a small baked sweet potato (2 oz or 58g).