Few foods wear their health halo as confidently as the banana. It is nature’s original energy bar: pre-portioned, self-wrapping, and sitting in the fruit bowl of half the world. But ask how many calories are in a banana and you get a dozen different answers — because a banana is not a fixed unit. The number runs from about 72 for the smallest to 135 for the largest, and the medium one everyone quotes sits at 105.
This page settles every version of the question: calories by size, full nutrition, what ripeness actually changes (and what it does not), the other forms bananas arrive in — chips, dried, bread — and how the fruit fits into a weight-loss plan.
It is also worth saying what this page is not: a warning about bananas. The fruit gets occasional criticism for its sugar, and some of it is misplaced. What follows is the full accounting — the numbers, the nuance and the fair verdict.
Quick Answer: A medium banana (about 118 g) has 105 calories. An extra small one has 72, a small 90, a large 121 and an extra large 135. That is the whole question, really — size. Ripeness changes the taste and the texture, but not the calories on the label.
Calories by Size
The USDA sizes bananas by length, and the calorie bands follow weight directly — about 89 calories per 100 g of edible flesh, whatever the size. Here is the official breakdown:
| Size | Weight | Calories |
|---|---|---|
| Extra small (under 6 in) | 81 g | 72 kcal |
| Small (6-7 in) | 101 g | 90 kcal |
| Medium (7-8 in) | 118 g | 105 kcal |
| Large (8-9 in) | 136 g | 121 kcal |
| Extra large (9 in and up) | 152 g | 135 kcal |
How to eyeball yours without a scale: measure against your forearm or your phone. A standard smartphone is about 6 inches tall — a banana roughly that length is a small; one that clearly outruns it by an inch or two is a medium; the foot-long monsters from some supermarket bunches are large or extra large. Most grocery bananas sold as medium really are: the 118 g, 105-calorie middle of the table.
If you track in grams rather than sizes, multiply by 0.89 calories per gram — a 130 g peeled banana lands near 116, essentially a large. And remember to weigh the edible part, not the peel: the weights in the table are for the fruit you actually eat, about two-thirds of what the banana weighs on the bunch. If you weigh a banana still dressed, subtract roughly a third.
The USDA size bands exist because a banana varies so much more than most foods — an extra large is nearly twice the extra small. That is unusual among single fruits, and it is why guessing is so unreliable. Two bananas from the same bunch can straddle the medium-large line, so the eyeball test above earns its keep.
Full Nutrition
A banana is a carbohydrate food with benefits — mostly fast and slow carbs, plus a mineral profile that explains its athletic reputation:
| Nutrient | Per 100 g | Per medium banana |
|---|---|---|
| Calories | 89 kcal | 105 kcal |
| Carbs | 22.8 g | ~27 g |
| Sugar | 12.2 g | ~14 g |
| Fiber | 2.6 g | ~3 g |
| Protein | 1.1 g | ~1.3 g |
| Potassium | 358 mg | ~420 mg |
That potassium number — roughly 420 mg in a medium banana — is the reason athletes have worshipped this fruit forever. Potassium helps nerves and muscles fire properly, and it is lost in sweat. The 27 g of carbs, packaged with about 3 g of fiber and plenty of water, is quick-but-not-violent energy: the classic pre-workout snack, and a genuinely good post-run one.
The vitamin B6 line is quietly the most interesting: a medium banana supplies about 24% of the daily value. B6 helps the body turn food into energy and supports normal immune function, and about 11% of the day’s vitamin C comes along for the ride. The banana was never just sugar — it is a modest multivitamin with a very good publicist.
One gap worth knowing: protein. At about 1.1 g per 100 g, the banana is not a protein food — pair it with yogurt, peanut butter or a handful of nuts and you get a snack that covers all three macros. The classic banana-and-peanut-butter pairing exists for a reason, even if the peanut butter deserves its own accounting.
Does Ripeness Change the Calories?
Here is the myth to kill first: the calories on paper do not change as a banana ripens. A medium banana is 105 calories green, yellow or spotted — ripening reshuffles the carbs inside, it does not add energy.
What actually happens is a starch-to-sugar conversion. A green banana’s carbs are mostly starch — including resistant starch, the kind that resists digestion and feeds the gut’s good bacteria. As the banana yellows, enzymes convert that starch into simple sugars: fructose, glucose and sucrose. A fully ripe banana can have most of its carbs as sugar, which is why it tastes like candy compared with the firm, almost starchy green one.
Two practical differences follow. First, glycemic index: green bananas sit around 30-40, which is low; ripe ones land around 51-60, moderate. Second, satiety: the resistant starch in a green banana keeps you full a bit longer and produces a gentler blood-sugar response. The honest bottom line: if you are managing blood sugar, a slightly green banana is the smarter pick. For everyone else, ripeness is a taste choice — yellow and spotty is sweeter, greener is firmer and a little more filling.
One more nuance the label never shows: a very ripe banana digests slightly more completely than a green one, so your body may extract marginally more usable energy from it — but we are talking single-digit calories either way, not a number that changes what you log.
How do you pick your stage? Green-leaning for lunchboxes (they ripen in the bag), yellow for eating now, brown-spotted for freezing and baking — that is when the sugars peak and the flavor is deepest. Buy a hand with mixed ripeness and the classic problem of four bananas ready at once disappears. Those overripe, brown-spotted bananas you almost threw out are the best ones for the freezer: the sugars have peaked, so smoothies and baking need less added sweetness, and the texture breaks down into exactly the creaminess a blender wants.
Banana in Other Forms
Fresh bananas are the light version of banana. Everything else on the shelf is either banana with the water removed, or banana with oil added — and the calories know the difference:
| Form | Serving | Calories | Why |
|---|---|---|---|
| Banana chips | 1 oz (28 g) | ~147 kcal | They are fried — oil does the work |
| Dried banana | Per 100 g | ~346 kcal | Water removed, sugar concentrated |
| Banana bread | 1 slice (~60 g) | ~196 kcal | Flour, sugar and butter in the batter |
| Frozen banana (for smoothies) | Same as fresh | Same as fresh | Nothing added, nothing removed |
Banana chips are the sleeper here: at about 147 calories per small ounce, they carry nearly four times the calories of the same weight of fresh banana, because the fryer did the work. They are a snack, not a fruit serving — look for the freeze-dried ones if you want crunch without the oil.
Banana bread is the other trap with a wholesome face. A 60 g slice at roughly 196 calories is cake accounting — butter, sugar and flour do most of the talking, and the banana is the garnish. Enjoy it as what it is, not as a fruit portion.
Smoothies deserve a sentence, too: a frozen banana plus milk or yogurt and ice is roughly the banana’s calories plus the dairy — an honest 150-200 for a modest homemade one. The trouble only starts with the juice-shop version, where banana, mango, honey and juice can stack well past 400. Blend at home and the banana behaves.
The good news: frozen banana is exactly as good as fresh. Peel ripe bananas, break them into chunks and freeze them — the calories are identical, and blended straight from frozen they make a thick, creamy smoothie base that needs no added sugar.
Bananas and Weight Loss
Can a 105-calorie fruit with 12 g of sugar help weight loss? Yes — and the sugar number needs context. That sugar arrives packaged with fiber and water in a whole food, which slows everything down. It behaves nothing like the added sugar in soda or candy, and the evidence is consistent: whole fruit is one of the most diet-friendly food groups there is.
The banana’s real talents for a diet are three: it is filling for its 105 calories (fiber, volume and chew time all help), it is the perfect pre-workout energy at a hundred-ish calories, and it is portable without packaging — the only snack that comes in a compostable wrapper. Keep one in the gym bag and the vending machine loses its power.
The pre- and post-workout timing is worth one more sentence. A banana eaten 30-60 minutes before exercise tops up energy stores without weighing you down; eaten within a couple of hours after a hard session, those same carbs help refill muscle glycogen. It is not magic — it is just convenient, correctly-sized fuel that needs no wrapper and no prep.
The watch list is short and specific: banana chips, dried banana and banana bread, per the table above. Fresh is the default; the processed forms are where the banana’s calorie count quietly triples or quadruples.
Portion strategy helps, too. Eat the banana deliberately — peel slowly, take actual bites — and the 105 calories registers as a real snack instead of a mouthful. Mindless grazing on dried banana rings, at about 346 per 100 g, is how the fruit’s reputation gets quietly rewritten; the fresh banana, eaten as a banana, has never been the problem.
Curious about other fruits that get the same questions? Our avocado calories guide pulls apart another much-debated fruit — small, medium and large, with the fiber story included. And for where a banana fits in your day as a whole, the maintenance calories calculator will show your personal daily target, so snack budgets are never a guess.
Frequently Asked Questions
The questions readers ask most about banana calories, answered with the same numbers used throughout the page:
How many calories in a banana?
105 calories for a medium banana (118 g). By size it runs from 72 for an extra small to 135 for an extra large.
How many calories in a large banana?
About 121 calories, for a 136 g fruit. That is only 16 more than a medium, which is why sizing your banana honestly matters more than worrying about it.
Do ripe bananas have more calories?
Not on paper — a medium banana is 105 calories green or spotted. Ripening converts starch to sugar, so it tastes sweeter and has a higher glycemic index, and very ripe bananas digest slightly more completely. But the label calories do not change.
Are bananas good for weight loss?
Yes, as a snack: filling, portable and 105 calories with fiber for a medium. The ones to watch are banana chips (about 147 per ounce), dried banana (about 346 per 100 g) and banana bread (about 196 a slice).
Banana vs apple — which is lower?
A medium apple is about 95 calories against the banana’s 105 — close. The banana is denser and more filling; the apple is crisper and slightly lighter. Pick the one you will actually enjoy.
