How many calories are in a banana?
A medium banana has about 105 calories. That's a peeled banana of 118 g, roughly 18 to 20 cm long. A small one has about 90 calories and a large one about 120.
Almost all of those calories come from carbs: around 27 g in a medium banana, plus about 3 g of fiber. Protein is just 1.3 g and fat barely registers.
Bananas are a fast, portable carb source loved by athletes for quick energy. The riper the banana, the more of its starch has turned to sugar.
Banana calories by size
USDA FoodData Central lists raw banana at 89 calories per 100 g and gives a standard weight for each size (USDA FoodData Central, Bananas, raw). All weights are for the peeled fruit.
| Size | Length | Weight | Calories | Carbs |
|---|---|---|---|---|
| Extra small | under 15 cm (6 in) | 81 g | 72 | 18.5 g |
| Small | 15 to 17 cm | 101 g | 90 | 23.1 g |
| Medium | 18 to 20 cm | 118 g | 105 | 27.0 g |
| Large | 20 to 22.5 cm | 136 g | 121 | 31.1 g |
| Extra large | 23 cm (9 in) or longer | 152 g | 135 | 34.7 g |
| 1 cup, sliced | 150 g | 134 | 34.3 g | |
| 1 cup, mashed | 225 g | 200 | 51.4 g |
Calories and carbs are calculated from the USDA per-100 g values and rounded.
Why some labels say 110 calories
You may have seen "110 calories" for a medium banana. That number comes from the FDA's nutrition poster for raw fruit, which uses a slightly heavier medium banana of 126 g (FDA raw fruits nutrition facts). Label values are also rounded, which is why the same poster shows 0 g fat and 1 g protein. Both numbers are fair. If you weigh your banana, 89 calories per 100 g gets you closest.
Good to know
Going from a small to a large banana adds about 30 calories. A banana with peanut butter is a classic snack, so check that page too before you log the pair.
Not sure how a 105-calorie snack fits into your day? Start with how many calories you should eat a day.
Track it the easy way
Measuring bananas gets old fast. With Calorie AI, just say what you ate, for example "a large banana with peanut butter," and the app estimates the calories and macros for you. It's an estimate, so when size really matters, a quick look at the table above keeps you honest.