How Much Fat In A Banana? The Numbers

A medium banana contains about 0.4 grams of fat. That is less than half a gram in a fruit that weighs roughly 118 grams. Fat makes up well under 1 percent of a banana’s weight, which is why bananas sit near the bottom of any list of fatty foods. The fat that is there is mostly unsaturated.

Most of a banana’s calories come from carbohydrate, not fat. A medium fruit delivers around 105 calories, and fat accounts for only about 3 of them. If you are tracking fat intake for a medical reason or just watching your diet, a banana barely registers.

How Much Fat In A Banana? The Numbers

The United States Department of Agriculture publishes nutrient data for bananas, and the fat figure is small enough that it is easy to round off. For a medium banana (about 7 to 8 inches long, 118 grams), fat comes to roughly 0.4 grams. A large banana (about 136 grams) has around 0.45 grams. A small banana (about 101 grams) has closer to 0.3 grams.

Here is how that breaks down across common serving sizes:

These are USDA reference values, so they reflect averages. A specific banana can vary a little depending on ripeness and variety, but the fat content stays in the same tiny range. There is no realistic scenario where a single banana pushes you over a fat target.

What Kind of Fat Is in a Banana?

The small amount of fat in a banana is mostly unsaturated. The dominant fatty acids are oleic acid and linoleic acid, the same types found in olive oil and many nuts and seeds, though in a banana the quantity is trivial. Saturated fat is present only in trace amounts.

This matters less than it sounds. Because the total fat is so low, the ratio of saturated to unsaturated fat in a banana has almost no practical effect on your diet. You would need to eat an unrealistic number of bananas to get a meaningful amount of fat of any kind.

One clarification worth making: the waxy feel of a banana peel is not fat. It comes from the peel’s own structure and compounds, not from a fatty layer. People sometimes assume the peel is oily, but it is not.

Where Do a Banana’s Calories Actually Come From?

Carbohydrate supplies almost all of a banana’s energy. A medium banana has roughly 27 grams of carbohydrate and about 1 gram of protein, alongside that 0.4 grams of fat. The carbohydrate is a mix of sugars, starch, and fiber.

The sugar and starch balance shifts as the fruit ripens. A green banana is high in resistant starch, a type of carbohydrate that resists digestion and behaves somewhat like fiber. As the banana ripens and turns yellow and then spotted, that starch converts to simpler sugars, which is why a ripe banana tastes sweeter. The total carbohydrate stays about the same; only the form changes.

Fiber content is around 3 grams for a medium banana. Fiber is a carbohydrate, not a fat, but it is part of why a banana feels filling despite its low fat content.

Does Banana Fat Matter for a Low-Fat or Heart-Healthy Diet?

For almost everyone, the fat in a banana is nutritionally irrelevant. It is too small to affect a daily fat target in any meaningful way. Dietary guidelines generally frame fat advice around total calories and the type of fat, and a banana contributes negligibly to either.

Where bananas do draw attention is carbohydrate and sugar, not fat. People managing blood sugar sometimes ask whether bananas are appropriate. A medium banana is a moderate source of carbohydrate, and how it affects blood glucose varies from person to person. If you have diabetes or prediabetes, the useful conversation is with your clinician or a dietitian about portion and pairing, not about fat.

For most people, a banana fits comfortably into a balanced eating pattern. The evidence does not support treating it as a high-fat or high-sugar food in the way those terms are usually meant.

How Does Banana Fat Compare to Other Fruits?

Bananas are low-fat even by fruit standards. Most fruits are low in fat, but a few are notable exceptions. Avocado is the clearest example: it is a fruit, and fat makes up a large share of its weight. Olives and coconut are similar outliers. A banana is nothing like these.

Compared with other common fruits, a banana’s fat content is in the same low range as an apple, an orange, or a handful of grapes. The difference between them is measured in fractions of a gram, which is not a distinction worth planning a diet around.

If someone told you bananas are fattening because of their fat content, the fat part is simply wrong. Any weight-related discussion about bananas would center on calories and portion, not fat. A medium banana at around 105 calories is not a high-calorie food by any standard.

Are There Any Reasons to Limit Bananas?

Bananas are safe for most people, but a few situations call for attention. People with advanced kidney disease are sometimes advised to watch potassium intake, and bananas are a potassium source. This is a clinical matter, and anyone with kidney disease should follow the guidance of their care team rather than general advice.

Banana allergies exist but are uncommon. Some people with a latex allergy cross-react to bananas, a pattern clinicians are familiar with. If you suspect a reaction, that is a conversation for a medical professional.

For the great majority of adults, there is no health reason to avoid bananas over their fat content. The fat is too low to be a concern, and the fruit brings fiber and potassium along with its carbohydrate.

Bottom Line on Banana Fat

A banana contains well under 1 gram of fat no matter its size. The fat is mostly unsaturated and nutritionally negligible. If fat intake is on your mind, a banana is not where it comes from. The calories you get are mostly carbohydrate, and the fruit’s practical value is in fiber, potassium, and convenience rather than in anything to do with fat.