A medium banana has 105 calories and 27 g of carbs. Get the complete banana nutrition facts: calories by size, macros, vitamins, and glycemic index.
Frequently Asked Questions
How many calories are in a medium banana?
A medium banana (about 118 g, 7–8 inches long) contains approximately 105 calories, 27 g of carbohydrates, 3.1 g of fiber, and 14 g of sugar, according to USDA data.
Are bananas good for weight loss?
Yes, when eaten as part of a balanced diet. Bananas are relatively low in calories, high in fiber, and highly satiating. A 24-year cohort study of over 133,000 adults found that banana consumption was not associated with weight gain.
What is the glycemic index of a banana?
The glycemic index (GI) of a banana ranges from about 43 for an under-ripe banana to 74 for a very ripe banana. A medium yellow banana has a GI of roughly 51, which is considered moderate.
Is banana high in potassium?
Yes. A medium banana provides 422 mg of potassium — about 9% of the daily value — making it one of the most accessible whole-food potassium sources.
Are bananas good before or after a workout?
Both. An under-ripe banana before a workout provides slower-releasing carbohydrates from resistant starch. A ripe banana after a workout delivers fast-absorbing sugars for glycogen replenishment, plus potassium to replace electrolytes lost through sweat.