A large baked potato with the skin has an average of 278 calories, 7.5 grams of protein and 63.2 grams of carbohydrates. It is very low in fat with 0.4 grams, and it contains a healthy dose of potassium with 1,600 mg, or 46 percent of the recommended daily values.
The potato contains high levels of vitamin C, with 28.7 mg, or 48 percent of the recommended daily intake. Vitamin B6 is another nutrient found in the potato in high quantities, with 0.9 mg or 46 percent DV. Manganese, magnesium and folate are also found in potatoes in fairly high quantities, as are phosphorus and iron.