URMC / Encyclopedia / Content Search Encyclopedia Nutrition Facts Potatoes, au gratin, home-prepared from recipe using butter, 1 cup Protein (g) 12.4 Total lipid (fat) (g) 18.6 Carbohydrate, by difference (g) 27.61 Energy (kcal) 323.4 Fiber, total dietary (g) 4.41 Calcium, Ca (mg) 291.55 Iron, Fe (mg) 1.57 Magnesium, Mg (mg) 49 Phosphorus, P (mg) 276.85 Potassium, K (mg) 970.2 Sodium, Na (mg) 1060.85 Zinc, Zn (mg) 1.69 Copper, Cu (mg) 0.39 Manganese, Mn (mg) 0.39 Selenium, Se (mcg) 6.62 Vitamin A, IU (IU) 646.8 Retinol (mcg) 149.45 Vitamin C, total ascorbic acid (mg) 24.26 Thiamin (mg) 0.16 Riboflavin (mg) 0.28 Niacin (mg) 2.43 Pantothenic acid (mg) 0.95 Vitamin B-6 (mg) 0.43 Folate, total (mcg) 26.95 Vitamin B-12 (mcg) 0 Folic acid (mcg) 7.35 Folate, DFE (mcg_DFE) 31.85 Cholesterol (mg) 56.35 Fatty acids, total saturated (g) 11.6 Fatty acids, total monounsaturated (g) 5.27 Fatty acids, total polyunsaturated (g) 0.68