Brown Rice Nutritional profile One cup of (100 grams of cooked brown rice provides the following nutrition: Carbs: 26 gm Fiber: 1.5 gm Protein: 3 gm Manganese: 40% of RDV Thiamine (B1): 15% of RDV Niacin (B3): 15% of RDV Pantothenic acid (B5): 8% of RDV Pyridoxine (B6): 8% of RDV Selenium: 10% of RDV Magnesium: 10% of RDV Phosphorus: 10% or RDV Zinc: 7% of RDV Calories: 124