The number of calories in a banana depends on its size. From extra small to extra large, a banana's calorie count ranges from 72 to 135.
Extra small bananas have 72 calories, while small bananas have 90. The caloric count is 105 for medium bananas, 120 for large bananas and 135 for extra-large. No matter the size, bananas are a low-calorie fruit that is rich in nutrients. Bananas are excellent sources vitamin B6, vitamin C, manganese, potassium, and fiber. They aid in digestion, promote heart health and increase energy levels. Bananas can be eaten raw or cooked, as a snack, dessert or ingredient in other foods.