Carbs in Banana: The Quick Answer
Banana contains 21.0g of net carbs per 100g, calculated by subtracting 1.7g of dietary fiber from 22.7g of total carbohydrates. With 97.0 calories, 0.7g protein, and 0.3g fat per 100g, it is classified as High Carbs for carbohydrate content.
Net carbs — not total carbs — are what matter for keto and low-carb diets. Only net carbs raise blood sugar and affect insulin, which is why tracking them accurately is key to staying in ketosis. Use our Keto Macro Calculator to find your daily net carb limit based on your body and goals.
Is Banana Keto Friendly?
Banana is high in carbs with 21.0g net carbs per 100g. It is generally not suitable for strict keto (under 20g net carbs/day) but may fit into a broader low-carb diet depending on portion size and your daily limit.
How Net Carbs Are Calculated
Net carbs are calculated by subtracting dietary fiber (and sugar alcohols, if present) from total carbohydrates: Net Carbs = Total Carbs − Fiber. For Banana: 22.7g − 1.7g = 21.0g net carbs per 100g.
Dietary fiber is subtracted because it passes through the digestive system without being absorbed as glucose. It does not raise blood sugar or trigger an insulin response, making it irrelevant for carb counting on keto and low-carb diets.