Blueberries do come in a variety of size classifications, from small (190-250 berries per cup) to extra large (<90 berries per cup). One serving size of fresh blueberries is equal to one cup, or 140 grams. This contains 80 calories, with no fat, cholesterol or sodium. One serving also contains 5 grams of dietary fiber, 19 grams of total carbohydrates, and 1 gram of protein. Please checkout our section on Nutrition Labels for a more complete answer.