Question: how many calories in a big bowl of oatmeal?
Answer: You're Eating it Plain On its own, oatmeal is relatively low-calorie, high in fiber, and high in protein. A serving of ½ cup dry oatmeal made with water sets you back 150 calories, 3 grams of fat, 27 grams of carbs, 4 grams of fiber, 1 gram of sugar, and 5 grams of protein.