How many carbs are in a banana?
A medium banana (118 g) of a banana has about 26.9 g of carbohydrate, of which roughly 23.8 g is net carbs (total minus 3.1 g of fiber). Per 100 g, a banana has 22.8 g of carbohydrate. Of that total, about 3 g is fiber and roughly 14 g is natural sugar. Bananas are a moderate glycemic-index food, and a greener, less ripe banana carries more resistant starch and slightly fewer available sugars.
Banana nutrition facts
| Nutrient | Per medium banana (118 g) | Per 100 g |
|---|---|---|
| Calories | 105 | 89 |
| Protein | 1.3 g | 1.1 g |
| Carbohydrate | 26.9 g | 22.8 g |
| Net carbs | 23.8 g | 20.2 g |
| Fiber | 3.1 g | 2.6 g |
| Sugar | 14.4 g | 12.2 g |
| Fat | 0.4 g | 0.3 g |
Values from Bananas, raw (USDA FoodData Central, FDC ID 173944). Figures vary with variety and preparation.
The carbs in a banana, in context
A banana is a carbohydrate food first, so on a strict keto plan (usually under 50 g net carbs a day) a single medium banana spends nearly half the budget and does not fit. On a normal or lower-carb diet it fits easily, and the fiber plus potassium make it a better carbohydrate than most processed snacks of the same size. Ripeness shifts the number: as a banana browns, resistant starch converts to sugar, so a very ripe banana hits blood sugar faster than a firm one.
Carbs by portion
Carbohydrate scales with size. A small banana (101 g) has about 23 g of carbohydrate, a medium (118 g) about 27 g, and a large (136 g) about 31 g. Sliced into a smoothie with other fruit and a sweetened base, the carbohydrate stacks up quickly beyond the banana itself.
| Portion | Weight | Net carbs |
|---|---|---|
| Small (101 g) | 101 g | 20.4 g |
| Medium (118 g) | 118 g | 23.8 g |
| Large (136 g) | 136 g | 27.5 g |
Logging a banana with Forkd tracks the carbs per meal from a photo, so hitting your target is something you can see rather than estimate.
Banana carbs: common questions
How many net carbs are in a banana?
A medium banana has about 27 g of total carbohydrate and 3 g of fiber, leaving roughly 24 g of net carbs.
Are bananas OK on keto?
Not really. A medium banana has about 24 g of net carbs, close to half a typical daily keto limit of 50 g, so most keto plans leave bananas out.
How many carbs are in a banana per 100g?
Banana has about 22.8 g of carbohydrate per 100 g, including 2.6 g of fiber and 12.2 g of natural sugar.
Do green bananas have fewer carbs?
The total carbohydrate is similar, but a greener banana has more resistant starch and less available sugar, so it raises blood sugar more slowly than a very ripe one.
Keep going
Sources: Bananas, raw (USDA FoodData Central, FDC ID 173944). Reviewed against USDA FoodData Central reference portions.
This page is for general educational purposes only and is not medical advice. Nutrition values are estimates sourced from USDA FoodData Central and may vary by variety, preparation, and portion. Always consult a qualified healthcare professional before making significant changes to your diet.