Learn how many calories , carbs, protein , fiber, and other nutrients are in one banana (without peel). See the glycemic index, glycemic load, insulin index, and mineral coverage of bananas. Bananas offer a source of carbohydrates and fiber, as well as numerous possible health benefits. Learn more here. Discover the health benefits of bananas , from aiding post-workout recovery to supporting heart health and easing digestive issues. Learn why this nutrient-rich fruit should be part of your diet. There are 121 calories in 1 large Bananas . Get full nutrition facts and other common serving sizes of Bananas including 1 oz and 1 extra small.