Carbs in bananas
For 1 medium banana (about 118 g), the estimated total carbohydrate is 27 grams and fiber is 3.1 grams. That gives approximately 23.9 grams of net carbohydrate using the common planning calculation of total carbohydrate minus dietary fiber. This is an estimate, not a laboratory result for every product.
| Serving | 1 medium banana (about 118 g) |
|---|---|
| Total carbohydrate | 27 g |
| Dietary fiber | 3.1 g |
| Estimated net carbs | 23.9 g |
A practical keto portion
If banana flavor matters, weigh a small slice and count it rather than estimating half a fruit. Ripeness and banana size vary, and larger bananas contain more carbohydrate.
For a thick smoothie, use avocado, ice and unsweetened almond milk. Banana extract can add aroma with fewer carbohydrates, but check the ingredient label for sweeteners.
How bananas fits into the complete day
A keto verdict is not a promise that eating bananas will produce or maintain ketosis. The meaningful number is the total carbohydrate across meals and drinks, considered alongside protein, energy intake, activity, medication and individual response. If you choose the 1 medium banana (about 118 g) serving shown above, record approximately 23.9 grams of net carbohydrate before adding accompaniments. Sauces, breading, sweetened drinks and larger second servings can change the calculation.
Plan the portion before the meal and leave room for vegetables and other nutrient-dense foods. Recheck the decision if the serving, recipe or brand changes. People using a therapeutic ketogenic diet need clinician-directed targets and should not substitute this general food guide for their prescribed plan.
Check the exact food label
Frozen banana, smoothie packs and dried banana are easy to overconsume. Dried fruit has less water and therefore concentrates carbohydrate into a much smaller-looking portion.
The U.S. Food and Drug Administration explains that Nutrition Facts labels state total carbohydrate and dietary fiber per serving. Compare the serving on the label with the amount you actually eat, and include sauces, coatings, drinks and other ingredients in the meal total.
Lower-carb alternatives
- avocado
- small raspberry portion
- banana extract