Here’s a clear, complete breakdown of the nutritional components found in a plain, raw potato (about 100 grams) — values vary by variety, size, and whether it’s cooked, but these are reliable averages.
Calories: ~77 kcal
Carbohydrates: ~17 g
Starch: majority of carbs
Sugars: ~0.8 g
Fiber: ~2.2 g
Protein: ~2 g
Fat: ~0.1 g
Potatoes are surprisingly nutrient-dense:
Vitamin C: ~20 mg (≈ 22% DV)
Vitamin B6 (pyridoxine): ~0.3 mg (≈ 15% DV)
Niacin (B3)
Folate (B9)
Pantothenic acid (B5)
Thiamine (B1)
Riboflavin (B2)
Vitamin K (small amount)
Potassium: ~425 mg (high!)
Phosphorus
Magnesium
Iron
Calcium
Zinc
Sodium: very low unless salted
Antioxidants: including flavonoids, carotenoids, and phenolic acids
Resistant starch: increases when potatoes are cooked and cooled (good for gut health)
Water: ~79%
Boiling or baking preserves most nutrients, though vitamin C decreases with heat.
Frying adds fat and increases calories.
Cooling cooked potatoes increases resistant starch.