How many calories are in banana?
Banana has 105 calories per 1 medium (118 g) — that's 89 calories per 100 g, roughly 5% of a 2,000-calorie day. Most of those calories come from carbohydrate.
USDA FoodData Central · raw · FDC 173944
Calories by portion
| Portion | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| 1 medium (118 g) | 105 | 1.3 g | 26.9 g | 0.4 g |
| 100 g | 89 | 1.1 g | 22.8 g | 0.3 g |
| 1 oz (28 g) | 25 | 0.3 g | 6.5 g | 0.1 g |
Where the calories come from
Protein 4% Carbs 93% Fat 3%
Calories computed from USDA per-100 g data (FDC 173944, SR Legacy). raw. The macro split uses general Atwater factors (protein and carbs ≈ 4 cal/g, fat ≈ 9 cal/g) and is approximate.
A medium banana carries about 105 calories — that comes straight from USDA’s 89 calories per 100 g for a typical 118 g fruit. That lands a banana in the sweet spot people remember it for: the roughly 100-calorie grab-and-go snack with its own wrapper. It’s a little more than an apple, a little less than a handful of nuts, and it arrives with potassium and fiber rather than empty calories.
Where a banana’s calories come from
A banana is a carbohydrate food, and its calorie breakdown shows it plainly. Of those ~105 calories, about 93% come from carbohydrate — the natural sugars and starch that make a banana sweet and quick to digest — with only a few percent each from its ~1.3 g of protein and its trace of fat. There’s essentially nothing else competing for the total. That’s why a banana behaves like fast fuel: the body turns that carbohydrate into usable energy quickly, which is exactly what you want before a workout and irrelevant if you were hoping for protein.
A moderate-density energy snack
On calorie density, a banana sits in the middle of the fruit pack — denser than watery berries or an apple, because it holds less water and more starch and sugar. That’s not a knock; it’s why a banana is genuinely satisfying for ~105 calories and why athletes reach for one mid-ride or post-run. The practical move is to treat it as what it is: a portion-controlled carbohydrate. One banana is a tidy ~100-calorie snack or pre-workout top-up; a smoothie with two bananas plus juice is a real carbohydrate (and calorie) load worth counting. Pair it with a protein source — yogurt, milk, or a scoop of whey — and you turn a pure-carb snack into a balanced one.
For the flip side of the macro picture, see protein in banana — and remember a banana’s calories are honest energy, not something to fear.
Frequently Asked Questions
How many calories are in a banana?
About 105 calories in one medium banana (118 g), based on USDA's 89 calories per 100 g (FDC 173944). Larger bananas run higher — a big 136 g banana is closer to 120 calories — but the familiar 'banana is about 100 calories' rule of thumb holds for a medium one.
How many calories are in a banana per 100 g or per ounce?
89 calories per 100 g, which is about 25 calories per ounce (28 g). That's a moderate calorie density for a fruit — higher than watery fruits like strawberries because a banana has less water and more starch and sugar.
Where do the calories in a banana come from?
Almost entirely carbohydrate. Using standard Atwater factors, roughly 93% of a banana's calories come from carbs (starch and natural sugar), about 4% from its ~1.3 g of protein, and only ~3% from its trace of fat. A banana is essentially a carbohydrate energy package.
Are bananas good for weight loss?
They can fit. A medium banana is about 105 calories with around 3 g of fiber and a big dose of potassium, so it's a filling, nutrient-dense snack — but it's more calorie-dense than berries or an apple, so portion still counts. For weight loss it's the total day's calories that matter, and a banana is an easy, satisfying way to spend ~100 of them.
How many calories are in two bananas?
About 210 calories for two medium bananas, plus roughly 6 g of fiber and close to 24 g of natural sugar. Two is a reasonable pre- or post-workout carb load; just count it as ~210 calories rather than a freebie.
When was this data last verified?
2026-06-04, against USDA FoodData Central FDC 173944 (Bananas, raw; SR Legacy). We re-verify reference pages periodically and update when the underlying USDA entry changes.
Whole-food values are USDA reference data, not a Labelgrade (that score is for branded packaged products). See our methodology and the TDEE calculator to turn this into a daily target.