Dry oats (old-fashioned oats; ½ cup) have 153 calories, 5 grams (g) of protein, 3 g of fat, 27 g of carbohydrates, 4 g of fiber, and 0 g of sugars. Oatmeal (old-fashioned oats, cooked in water; 1 cup) has 163 calories, 5 g of protein, 3 g of fat, 32 g of carbohydrates, 4.5 g of fiber, and 1 g of sugars.