A medium banana has 105 calories. Full calorie breakdown by size, type, and ripeness — plus macros, glycemic index, and weight loss facts.
Frequently Asked Questions
How many calories are in a medium banana?
A medium banana (about 118 g peeled) contains approximately 105 calories, 27 g of carbohydrates, 3.1 g of fiber, and 14 g of natural sugars, based on USDA FoodData Central data.
Are bananas good for weight loss?
Yes. A Harvard cohort study of 133,468 adults found that increased whole fruit consumption — including bananas — was associated with less weight gain over time. Bananas provide 3 g of fiber per medium fruit, which promotes satiety and helps control overall calorie intake.
How many carbs are in a banana?
A medium banana contains about 27 g of carbohydrates, of which 3.1 g is dietary fiber and 14 g is natural sugar. Unripe green bananas contain more resistant starch and less sugar, giving them a lower glycemic impact than ripe yellow bananas.
What is the glycemic index of a banana?
A ripe yellow banana has a glycemic index of 51 — classified as low (GI below 55). An unripe green banana sits lower at 42–48, while an overripe brown banana can reach a GI of 74. Ripeness is the biggest single factor in how quickly a banana raises blood sugar.
How many calories are in a banana with the peel on?
The peel adds about 40–60 g of weight but contributes near-zero digestible calories. All standard calorie counts — including the 105-calorie figure for a medium banana — refer to the peeled fruit only.