How much fiber is in a banana?
Bananas have 3.1 grams of fiber in 1 medium banana (118 grams), according to USDA FoodData Central. That is 11% of the Daily Value, which the FDA's label rules call a good source of fiber. Per 100 grams, bananas have 2.6 grams of fiber.
3.1gof fiber in 1 medium banana
12% of a 25 gram day
Fiber in bananas by serving size
| Serving | Weight | Fiber |
|---|---|---|
| 1 extra small (less than 6" long) | 81g | 2.1g |
| 1 small (6" to 6-7/8" long) | 101g | 2.6g |
| 1 medium (7" to 7-7/8" long) | 118g | 3.1g |
| 1 large (8" to 8-7/8" long) | 136g | 3.5g |
| 1 cup, sliced | 150g | 3.9g |
| 1 extra large (9" or longer) | 152g | 4g |
| 1 cup, mashed | 225g | 5.9g |
| 100 grams | 100g | 2.6g |
How bananas compare with other fruits
Bananas rank 6 of 11 fruits in this library, by fiber in one serving.
- Apple4.4g
- Blueberries3.6g
- Banana3.1g
- Orange3.1g
- Strawberries3g
Each bar is one serving: apple, 1 medium apple, with skin; blueberries, 1 cup; banana, 1 medium banana; orange, 1 orange; strawberries, 1 cup, halved.
Size changes the number more than you would think
A small banana has 2.6 grams of fiber and an extra large one has 4. That is a bigger gap than most people guess from looking at them. If you log bananas, pick the size you ate.
What to eat it with
Slice a medium banana over a cup of cooked oatmeal and you have 7.1 grams of fiber before you leave the house. Add 2 tablespoons of peanut butter and it is 8.7 grams, about a third of a 25 gram day.
More fiber alongside bananas
- Chia seeds: 9.8 grams in 1 ounce (about 2 tablespoons)
- Oatmeal: 4 grams in 1 cup, cooked
- Almonds: 3.5 grams in 1 ounce (about 23 almonds)
Not sure what your daily number should be? The fiber calculator works it out from your age and sex.
Questions about fiber in bananas
- How much fiber is in a banana?
- Bananas have 3.1 grams of fiber in 1 medium banana, which weighs 118 grams. The number comes from USDA FoodData Central.
- Are bananas high in fiber?
- One serving, 1 medium banana, has 3.1 grams. That is 11% of the Daily Value, which the FDA's label rules call a good source of fiber. Bananas rank 6 of 11 fruits in this library by fiber per serving.
- How much fiber is in 100 grams of bananas?
- 2.6 grams of fiber per 100 grams. The largest size USDA lists, 1 cup, mashed, weighs 225 grams and has 5.9 grams of fiber.
- How many bananas would it take to reach 25 grams of fiber?
- About 8.1, at 3.1 grams each. Most people reach 25 grams by mixing several foods across the day.
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Source: USDA FoodData Central, Bananas, raw, retrieved October 8, 2026. Label terms follow the FDA's 28 gram Daily Value for fiber.