How Many Calories Are in Bananas? 105 in a Medium

How many calories are in bananas? A medium banana carries about 105 calories, an extra small one about 72, and an extra large one about 135, using commonly cited figures from the United States Department of Agriculture. The whole spread comes down to one thing, the size of the fruit, which is why the same banana can seem to carry a different number every time you look it up: the energy in a whole fruit tracks its weight fairly closely, and per 100 grams of peeled fruit the figure holds near 89 calories. Those calories are almost all natural carbohydrate, arriving with fiber, potassium, and other nutrients that a bare calorie count never shows. The number is not mysterious once you know which banana you are holding.

This evidence review is a plain-language reference for the calories in a banana, organized so you can find the size you have and understand the figure once you do. It answers the headline question first, then walks through USDA calories by size, calories per 100 grams, the carbohydrate, sugar, fiber, and potassium a banana carries, how ripening changes it, and how a banana fits into a diet, a workout, or a comparison with other fruit. It is educational, describes food composition only, and is not diet or medical advice. For a broader table, see our reference on calories in common foods, and for how much you personally need, our calorie needs review. You can also tally a banana in the companion below.

How many calories in a banana

Start with the question people search for most. Using USDA reference data, a medium banana, roughly seven to eight inches long and about 118 grams, is commonly cited at about 105 calories. That is the figure most databases use for an average fruit, and it follows directly from the USDA value of roughly 89 calories per 100 grams scaled to the weight of a medium banana. A smaller banana lands lower and a larger one higher, because the calories follow the size of the fruit, which is true of most whole fruits.

Almost all of those calories come from natural carbohydrate. A medium banana carries only about a gram of protein and a trace of fat, so the carbohydrate, near 27 grams, supplies nearly the entire calorie count. That carbohydrate does not arrive alone, though, which is the point a single number hides: the same banana brings fiber, potassium, vitamin C, vitamin B6, and water, so its 105 calories are nutritionally richer than the same energy from a sweet with no other nutrients. Read 105 as a commonly cited, USDA-based reference for a medium fruit rather than an exact reading of the banana in your hand, and weigh the fruit or check a database when a recipe or a goal calls for precision.

How many calories are in bananas

How many calories are in bananas is really a question about which banana, because the fruit is sold loose and unlabeled and no two in a bunch weigh the same. Across the USDA size range the commonly cited figures run from about 72 calories in an extra small banana to about 135 in an extra large one, with the familiar medium banana near 105 in the middle. That is the honest answer: a range with a well-known anchor, not a single fixed number. Underneath the range sits one steady value, about 89 calories per 100 grams of peeled fruit, and every size figure below is simply that value scaled to a reference weight.

The table reads the whole range at once, and because people usually eat bananas rather than a single reference fruit, the last column shows what two of each size come to. A bunch on the counter tends to become two bananas across a day, and that is where the difference between sizes stops being trivial.

Read down the last column and the practical point lands. Two extra small bananas come to roughly 144 calories while two extra large ones reach about 270, a gap of well over 100 calories for what most people would describe identically as “two bananas”. Nobody eats a size category, so the useful habit is to glance at the fruit against the length ranges above before reaching for a number, since eyeballing length gets you close enough for everyday planning.

Two further points keep the range in perspective. First, the differences between sizes are differences in how much fruit you are eating, not in how caloric bananas are, because the density per gram barely moves across the range: every row above sits near the same 89 calories per 100 grams. Second, the nutrients scale with the calories, so a larger banana brings proportionally more fiber, potassium, and natural sugar along with its extra energy, which is a fair trade rather than a penalty. Bananas of any size remain moderate, nutrient-carrying fruit rather than an outlier at either end. Set a size and a count in the companion below to see these figures update for the bananas you actually eat. Every value here is a commonly cited USDA-based reference averaged across many samples, not an exact measurement of your fruit.

Calories in a banana by size

Because a banana’s calories track its weight, the most useful way to answer the question is by size, and USDA publishes reference weights and figures for the common banana sizes. The names below are USDA’s own size categories, and the calorie figures are the commonly cited values that follow from the per 100 gram number, rounded and framed as approximate because real bananas vary.

The spread is worth sitting with. An extra small banana near 72 calories and an extra large near 135 differ by more than 60 calories, nearly double, which is why a single quoted figure can feel wrong: it was probably measured on a different size than the one you have. The practical habit is to picture your banana against these categories, since eyeballing length gets you close enough for everyday planning. When you need to be exact, a kitchen scale plus the per 100 gram figure below beats any size label, because two bananas of the same length can still differ in weight. Every figure here is a commonly cited USDA-based reference, not a precise measurement, and it describes the fruit alone before anything is added.

A banana size and calorie table

Here is the same information as a quick table, with the carbohydrate and sugar that travel with the calories, scaled from USDA per 100 gram values to each size’s reference weight. The weight column is what the figures describe, and it is the first thing to check, since the calories, carbs, and sugar all scale with it.

Two rows at the bottom are worth flagging, because they are where banana calories quietly climb. A cup of sliced banana, common in cereal or a smoothie, is roughly a large-and-a-bit banana at about 134 calories, and a cup of mashed banana, common in baking, packs nearly two bananas at about 200 calories, since mashing compresses more fruit into the cup. This is the portion trap in miniature: a banana measured by the cup carries more than a banana counted as one fruit. Read the weight beside every figure, and treat the table as an illustrative, USDA-based map rather than a precise ledger for the specific banana in front of you.

Calories in a banana per 100 grams

The steadiest way to talk about banana calories, and the one that sidesteps the size confusion entirely, is per 100 grams. USDA lists a raw banana at about 89 calories per 100 grams, and because that figure is tied to a fixed weight rather than a subjective size, it is the number to reach for when you weigh the fruit. Multiply the weight of your peeled banana in grams by 0.89 and you have its calories, which is as precise as a home kitchen gets.

That per 100 gram value also lets you place a banana among other foods honestly. At 89 calories per 100 grams, a banana is denser than watery fruits like watermelon or strawberries, which sit in the 30s and 40s, and lighter than dried fruit, nuts, or anything fried, which run several times higher because they are low in water or rich in fat. Bananas are moderately dense for fresh fruit mainly because they hold less water and more carbohydrate than a berry or a citrus, not because they are unusually caloric. The 89 figure is a commonly cited USDA average across many bananas, so your particular fruit scatters around it a little, but for weighing and comparing it is the most reliable single number in this review.

The carbs in a banana

Carbohydrate is the story of a banana’s calories, because nearly all of them come from it. USDA figures put a banana near 22.8 grams of carbohydrate per 100 grams, which works out to roughly 27 grams in a medium fruit, about 31 grams in a large one, and about 18.5 grams in an extra small one. Since carbohydrate carries about 4 calories per gram, that 27 grams in a medium banana accounts for essentially the whole 105 calorie figure, with only trace protein and fat rounding it out.

Not all of that carbohydrate behaves the same way, which is where a banana gets interesting. The total splits into sugars, starch, and fiber, and the balance shifts as the fruit ripens: a green banana holds more starch, a ripe one more sugar, while the total carbohydrate stays about the same. For anyone tracking carbohydrate for a personal reason, a medium banana’s roughly 27 grams is a moderate amount, comparable to a slice or two of bread, and it is worth counting as such. Our look at how many carbs per day puts a single banana in the context of a whole day. These are commonly cited USDA-based figures that move with size and ripeness, not fixed values, and they describe the fruit itself, before it is baked, blended, or sweetened.

Sugar in a banana

Sugar is the part of a banana people ask about most, and the honest answer separates two things that often get blurred. USDA lists a banana at about 12.2 grams of sugar per 100 grams, which is roughly 14 grams in a medium fruit and about 18.5 grams in an extra large one. That is real sugar, and it is why a ripe banana tastes sweet. But it is the fruit’s own natural sugar, bound up with fiber and water inside the whole food, which is different in important ways from the added sugar stirred into processed products.

The difference matters because fiber and water slow how quickly a whole fruit’s sugar is digested and add fullness that a spoon of table sugar does not, so an equal amount of sugar from a banana and from candy does not behave identically in a meal. That is not a claim that banana sugar is calorie-free or that quantity never matters, since the calories are the same per gram, but it is why nutrition guidance commonly distinguishes the naturally occurring sugar in whole fruit from added sugar. If you are watching sugar for a specific reason, our note on how much sugar per day covers where the common limits apply, and they focus on added sugar rather than the sugar in whole fruit. These are illustrative USDA-based figures, and anyone managing blood sugar should follow personalized guidance from a clinician.

Fiber in a banana

Fiber is the quiet counterweight to a banana’s sugar, and it is part of why a banana feels more like food than a sweet. USDA figures put a banana near 2.6 grams of fiber per 100 grams, which is about 3 grams in a medium fruit, a modest but real contribution toward the fiber most adults are commonly advised to get and often fall short of. That fiber is a mix of soluble and insoluble types, and in a slightly green banana it is joined by resistant starch, a form of carbohydrate that acts much like fiber in the gut.

The presence of fiber is a big part of why a banana behaves differently from its sugar content alone would suggest. Fiber slows digestion, blunts the speed at which the fruit’s sugar is absorbed, and adds to the fullness a whole banana provides, which is one reason a banana can be a more satisfying snack than a sugary drink with similar calories. It also feeds the bacteria in the gut, part of fiber’s broader appeal. For how a banana fits a fiber goal across the day, our guide to how much fiber you need lays out the commonly cited targets. As always, 3 grams is an illustrative USDA-based figure that shifts with the size and ripeness of the specific fruit.

How much potassium is in a banana

Potassium is the nutrient a banana is famous for, and the reputation is largely earned, if a little oversimplified. USDA lists a banana at about 358 milligrams of potassium per 100 grams, which is roughly 420 milligrams in a medium fruit, a meaningful share of the potassium many adults are commonly advised to get in a day. Potassium plays a role in fluid balance, nerve signaling, and muscle function, which is part of why the banana became a symbol of the post-workout snack.

The honest footnote is that bananas are not uniquely rich in potassium, they are simply convenient and popular. A baked potato, a cup of cooked beans or lentils, plain yogurt, leafy greens, and many other everyday foods carry as much potassium as a banana or more, so a banana is one good source among many rather than the only one. It is worth adding a genuine caution here: potassium needs and safe limits differ from person to person, and certain medical conditions, especially some kidney conditions, and certain medications change how much potassium is appropriate, sometimes calling for less rather than more. Anyone managing potassium for a health reason should follow their doctor’s or dietitian’s guidance rather than a general figure. The 420 milligram number is an illustrative USDA-based reference for a medium fruit, not a personal recommendation.

Where the calories in a banana come from

Pull a banana’s calories apart and the picture is lopsided in a way that explains a lot about the fruit. Nearly all of the energy is carbohydrate, with protein and fat present only in traces. That is typical of fruit and unlike, say, an avocado, which is a fruit whose calories come mostly from fat. Seeing the split makes clear why ripeness changes taste but not calories, and why a banana is best thought of as a carbohydrate food.

The chart makes the ripe versus green point concrete before the next section spells it out. In a ripe banana, sugars are the largest slice, which is why it tastes sweet, while starch has shrunk as it converted to sugar. In a green banana the same bars would shift, with starch larger and sugars smaller, yet the whole bar, the total carbohydrate and therefore the calories, would be about the same length. Fiber holds roughly steady through ripening. This is the visual reason a banana’s calorie count is so stable across ripeness: the fruit is rearranging its carbohydrate, not gaining or losing much of it. The figures are illustrative USDA-based shares, not exact readings of any one banana.

Ripe versus green bananas

The ripe versus green question is the one where intuition most often misleads people, so it is worth stating plainly: a ripe banana and a green banana of the same weight carry nearly the same calories. Ripening is a chemical rearrangement, not a change in energy. As a banana ripens, enzymes convert its starch into simpler sugars, which is why a spotty yellow banana tastes far sweeter than a firm green one, but converting one carbohydrate into another does not meaningfully change the calorie total, both hovering near the commonly cited 89 per 100 grams from USDA.

What does change is how the fruit behaves. A green banana’s starch includes more resistant starch, which digests slowly and acts like fiber, so a greener banana releases its energy more gradually and tastes starchy rather than sweet. A ripe banana’s sugars are digested faster and taste sweeter, and its softer texture makes it easier to eat and to bake with. Neither is better in a blanket sense, since the choice is about taste, texture, and digestion rather than calories. People sometimes prefer greener bananas for the resistant starch or riper ones for sweetness and easy digestion, and both are reasonable. The single takeaway is that ripeness is a flavor and texture decision, and the calorie figures in this review apply across the ripeness range as commonly cited USDA-based averages.

Do banana calories change as they ripen

Because the ripeness question comes up so often, it is worth a direct answer with the mechanism attached. The calories in a banana barely change as it ripens, moving by only a small amount that is well within the natural variation between two bananas. The reason is that the fruit’s total carbohydrate stays roughly constant while its form shifts from starch to sugar. Since starch and sugar carry the same calories per gram, rearranging one into the other leaves the energy total nearly untouched.

A very ripe, heavily spotted banana can lose a little weight as it dehydrates slightly, which would nudge its calories down in absolute terms simply because there is marginally less fruit, but per gram the figure holds near the USDA value. This is why you can trust the same calorie estimate whether your banana is firm and green or soft and sweet: weigh it, apply the per 100 gram figure, and the number is reliable across ripeness. The practical lesson is to choose ripeness for how you want the banana to taste and digest, not out of any belief that a green banana is meaningfully lighter or a ripe one meaningfully heavier. These are commonly cited USDA-based figures, and the small shifts ripeness causes are smaller than the difference between one banana and the next.

Are bananas good for weight loss

This is where the honest answer has to push back on the question a little, because no single food causes or prevents weight change on its own. A banana is neither a fat-burning superfood nor a fruit to fear, despite both claims circulating widely. What a banana offers is a whole food that brings fiber, water, and volume for a modest, commonly cited 105 calories or so in a medium fruit, which can make it a filling, naturally portioned snack that fits comfortably into many eating patterns.

The features that make a banana useful for people managing weight are practical rather than magical: it is easy to grab, it comes in its own wrapper, it satisfies a sweet craving with fiber attached, and it is a common swap for more processed snacks that carry more calories and less nutrition. Weight change, though, tracks total calories and many other factors over weeks and months, not the presence or absence of one fruit, so the meaningful question is how a banana fits your overall day, which our calorie needs review helps you frame. Anyone with a specific weight goal, a medical condition, or a medication that affects appetite or metabolism should work the plan out with a doctor or registered dietitian rather than adding or cutting bananas on their own. Nothing in this review is a prescription.

Bananas before and after a workout

The banana is a fixture of the gym bag and the finish line, and the reasoning behind that is sound even if it is sometimes overstated. Before exercise, a banana offers easily digested carbohydrate, roughly 27 grams in a medium fruit, that the body can use for fuel, which is why some people reach for one an hour or so before activity. After exercise, the same carbohydrate plus the fruit’s potassium fits the common goal of replenishing energy stores, which is where the post-workout banana earned its reputation.

The useful perspective is that a banana is a convenient carbohydrate source around exercise, not a required or uniquely effective one. Whether a pre or post workout snack helps, and how much of it, depends on the length and intensity of the activity, the timing of other meals, and individual factors, so a casual walk needs no special fueling while a long, hard session might. The potassium a banana provides is real but is not a substitute for overall hydration and a balanced diet, and electrolyte needs during exercise vary widely. Use a banana around a workout if it sits well and suits your routine, treat the figures here as commonly cited USDA-based references, and let a coach, doctor, or dietitian guide any serious training nutrition rather than a general article.

Bananas in a balanced diet

Zoom out from the single fruit and the sensible framing is that a banana is one ordinary, useful component of a varied diet, not a food to build around or avoid. Its modest calories, natural sweetness, fiber, and potassium make it an easy addition to breakfast, a portable snack, or a base for smoothies and baking, and its convenience is a genuine virtue in a world where reaching for whole fruit is often the harder choice. A banana on oatmeal, sliced into yogurt, or paired with a spoon of nut butter turns a plain base into something more satisfying with little effort.

Balance is the operative idea. A banana pairs well with protein and fat, which slow digestion and add staying power, so a banana with yogurt or nut butter is a steadier snack than a banana alone. It also complements other fruits and vegetables, since variety spreads the range of nutrients no single food provides. For putting a banana onto a plate that hangs together, our note on building a balanced meal walks through the proportions, and you can see how a banana adds up in the companion below. None of this is a rule about how much fruit anyone should eat, which is a personal question, only a description of how a banana commonly fits a varied diet.

How a banana compares with other fruits

Placing a banana among other fruits clears up the sense that it is either unusually caloric or unusually sugary, because on the whole it sits in a reasonable middle. Per 100 grams, USDA puts a banana near 89 calories, above watery fruits and below dense or fatty ones. A cup of strawberries is near 49 calories, an orange near 62, a medium apple near 95, and a half avocado near 120, so a banana lands in the ordinary company of everyday fruit rather than at any extreme.

The comparison also shows why per serving and per 100 grams can tell slightly different stories. A banana looks a little higher per serving partly because a medium banana is a fair amount of fruit by weight, not because it is exceptionally dense per gram. Berries look light in part because a cup of them is mostly water. The lesson is the one that runs through our calories in common foods reference: read the serving beside every figure, and treat a banana as a normal, nutritious fruit rather than an outlier. All of these are commonly cited averages that vary with size and ripeness, and a database refines them when you weigh the fruit.

Green bananas and resistant starch

Green bananas deserve their own note, because they are nutritionally distinct enough to interest people who look past the calorie count. The carbohydrate in a firm green banana is richer in resistant starch, a form that resists digestion in the small intestine and behaves much like fiber, passing to the large intestine where gut bacteria ferment it. This is why a green banana tastes starchy rather than sweet and feels different to eat, even though its total calories sit near the same commonly cited USDA figure as a ripe one.

The practical appeal of resistant starch is that it adds to the fiber-like content of the fruit and is slowly digested, though the effects are modest and the science is still developing, so it is best treated as a mild plus rather than a reason to force down unripe fruit you dislike. As a banana ripens, most of that resistant starch converts to sugar, which is the trade behind the sweeter taste. Some people split the difference by choosing barely yellow bananas, and green banana flour is a way the resistant starch appears in cooking. The calorie figures across ripeness stay close, so this is a choice about digestion and taste, and any specific digestive concern belongs with a clinician rather than a general article.

How many bananas a day is reasonable

People often ask whether there is a limit on bananas, and the honest answer is that there is no universal number, only sensible context. For most healthy people, a banana or two a day fits easily within a varied diet, contributing modest calories, fiber, and potassium without crowding out other foods. The idea of a hard cap comes mostly from the potassium question, and for people without relevant medical conditions, the potassium in a few bananas is well within normal dietary intake.

The caveats are real and worth stating. Because bananas are moderately caloric for fruit and carry carbohydrate, someone counting either for a personal reason should fold bananas into that count rather than treating fruit as free. More importantly, people with certain kidney conditions or on medications that raise potassium may be advised to limit high-potassium foods, which is exactly the kind of individual guidance a doctor or dietitian provides. Variety also matters: eating many bananas in place of other fruits and vegetables narrows the range of nutrients a diet provides, so bananas are best as one part of a mix. There is no single right number of bananas, and anyone with a specific health situation should let their clinician, not a general figure, set the guidance. The figures here describe the fruit, not a recommended quantity.

How much calories in a banana, by size and ripeness

How much calories in a banana is a question people type in every phrasing imaginable, and the answer does not change with the wording: a medium banana is commonly cited near 105 calories, an extra small near 72, and an extra large near 135, all of it scaled from about 89 calories per 100 grams of peeled fruit. Whether someone asks how much, how many, or how much is in one, they are asking the same thing, and the figure they want is the one attached to the size of fruit in front of them.

Ripeness is the second thing people usually mean when the number does not match their expectation, and here the intuition misleads more than the phrasing does. A sweet, spotted banana and a firm green one of the same weight carry nearly the same calories, because ripening rearranges starch into sugar rather than adding energy, and both forms of carbohydrate carry about 4 calories per gram. The sweetness climbs, the calorie total does not. A very ripe banana may weigh slightly less as it dries out, which trims its absolute figure a little, but per gram the value holds.

What genuinely does change the number is the form the banana arrives in. Sliced into a cup, a banana reads near 134 calories because a cup holds more than one medium fruit; mashed into a cup for baking, closer to 200, since mashing packs more fruit into the same volume. Dried banana chips are a different food again, far denser per gram because the water is gone and many are fried in oil, so they should never be counted against the fresh fruit figures here. A banana blended into a smoothie carries its own calories plus everything blended with it, and a banana under nut butter or honey carries the topping’s calories too, which often exceed the fruit’s.

The reliable way through all of this is to separate the fruit from everything around it. Count the banana by size, or better by weight, then count the additions on their own line. That habit answers the question in every phrasing at once and keeps the estimate honest, since the errors people make counting bananas are almost always about the serving or the toppings rather than the fruit. You can work through the arithmetic for your own size and count in the companion below. These are commonly cited, USDA-based reference figures for food composition, illustrative rather than exact, and nothing here is a recommendation about how much fruit anyone should eat.

Common mistakes when counting banana calories

A handful of recurring errors explain most of the confusion about banana calories, and each is easy to avoid once named.

• Ignoring the size. A single quoted figure like 105 calories describes a medium banana, so applying it to an extra small or extra large fruit can be off by 30 calories or more in either direction.
• Measuring by the cup without adjusting. A cup of sliced or mashed banana holds more than one fruit, so cereal, smoothies, and baking often use more banana, and more calories, than counting one banana suggests.
• Assuming ripe bananas are much higher in calories. Ripening converts starch to sugar with little change in total energy, so a sweet banana is not meaningfully more caloric than a green one of the same weight.
• Fearing the natural sugar. The sugar in a whole banana comes packaged with fiber and water and is different from added sugar, though it still carries calories, so context matters more than avoidance.
• Treating the figures as exact. Every number here is a commonly cited USDA-based average with a real margin, not a precise reading of your particular fruit.

Each of these is a reading error more than an eating one, and clearing them up makes the tables and charts above far more useful. The numbers are only as reliable as your grasp of which banana, and which serving, the figure describes.

How to count a banana accurately

When a rough estimate is not enough, counting a banana precisely is simple, and it beats any size label. The most accurate home method is to weigh the peeled fruit in grams and multiply by the USDA per 100 gram figures: about 0.89 for calories, 0.228 for carbohydrate, 0.122 for sugar, 0.026 for fiber, and 3.58 for potassium in milligrams. A 120 gram peeled banana, for instance, works out to roughly 107 calories, 27 grams of carbohydrate, and 430 milligrams of potassium, which is as exact as a kitchen scale allows.

Without a scale, the size categories above are the next best tool, since matching your banana to extra small, small, medium, large, or extra large by length gets you within a sensible margin. Either way, the peeled weight is what matters, because the peel adds weight but no edible calories, so weighing an unpeeled banana overstates the figure. For anything you add, count the extras separately, since a spoon of nut butter or a drizzle of honey can carry more calories than the banana itself. You can run a banana through the companion below to see calories, carbs, sugar, fiber, and potassium by size, and reach for a food label or a reputable database whenever a recipe or a goal genuinely depends on the figure. Every value here is a commonly cited USDA-based reference, not an exact measurement of your fruit.

The bottom line

The calories in a banana are not a mystery once you know the size you are holding. Using USDA figures, an extra small banana sits near 72 calories, a medium near 105, and an extra large near 135, all of it almost entirely natural carbohydrate that arrives with about 3 grams of fiber, roughly 14 grams of natural sugar in a medium fruit, and around 420 milligrams of potassium. Ripening changes the taste as starch turns to sugar but barely touches the calorie total, so a green banana and a ripe one of the same weight carry nearly the same energy. A banana is a moderate, nutritious fruit that fits many diets, useful around a workout and as an easy snack, without being a food to build a plan around or to fear. Every figure here is a commonly cited, USDA-based reference for food composition, not an exact measurement or a personal target, so pair it with our calories in common foods reference and our calorie needs review, weigh the fruit when you need precision, and confirm anything tied to your weight, potassium, blood sugar, or any medical condition with a qualified professional such as a doctor or registered dietitian.

This evidence review is published for education and describes the commonly cited, USDA-based nutrient content of bananas, not medical, dietetic, or dietary advice, and reading it creates no clinician-patient relationship. Every calorie, gram, and milligram figure above is an illustrative reference averaged from USDA data rather than an exact measurement of any particular fruit, and real bananas vary by size, variety, and ripeness. This article does not tell anyone how many bananas to eat, endorse any eating pattern, or make claims about weight, blood sugar, or any health condition; potassium in particular can need limiting for some kidney conditions and medications. For a calorie, carbohydrate, potassium, or fruit intake plan suited to your body, goals, medications, pregnancy, or any medical condition, consult a qualified health professional such as a doctor or registered dietitian.