A baked potato is relatively low in calories when served alone. However, when you add extra condiments such as butter, sour cream and cheese, you also add extra calories.
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One medium-sized baked potato that includes the skin contains approximately 163 calories, according to the U.S. Department of Agriculture National Nutrient Database. Leaving off the skin lowers the calorie count to 145. Baking doesn't add calories as long you don't add oil or other condiments to the skin. A medium potato supplies approximately 36 grams of carbohydrate, or around 144 calories from carbohydrate.
Adding 1 tbsp. of butter or margarine to your baked potato adds about 100 calories. Top it with 1 tbsp. of sour cream and you add about 23 more calories. Adding 1 oz. of cheese adds another 70 to 100 calories, depending on the type of cheese you use.
A baked potato can be part of a healthy, nutritious diet. Because it contains no cholesterol and very little fat, including a baked potato in your diet can help you meet recommendations by the American Heart Association for fat and cholesterol consumption.