First of all, here are some basic banana nutrition facts for an average-size, medium-ripe banana: Calories in a banana = 371 kJ (89 kcal) Pantothenic acid (B5) = 0.334 mg (7%) Carbohydrates = 22.84 g Vitamin B6 = 0.367 mg (28%) Sugars = 12.23 g Folate (Vit. B9) = 20 µg (5%) Dietary fibre =