One medium banana (about seven inches long) provides about 110 calories , 0 grams fat, 1 gram protein, 28 grams carbohydrates, 15 grams sugar (naturally occurring), 3 grams fiber, and 450 mg potassium. An average-sized banana contains about 100 calories and 25 grams medium (7″ to 7-7/8″ long) (118g grams). There are 210 calories in 2 medium Bananas . Get full nutrition facts and other common serving sizes of Bananas including 1 oz and 1 extra small. There are 242 calories in 2 large Bananas . Get full nutrition facts and other common serving sizes of Bananas including 1 oz and 1 extra small. How Many Calories Are in 2 Bananas? Calories in 1 Banana To answer how many calories are in 2 bananas, we must first look at the calorie content of a single banana . The calorie count of a banana can vary depending on its size and ripeness, but on average: A small banana (about 100 grams) contains around 90 calories . A medium banana (about 118 grams) has around 105 calories . A large banana (about 136 grams) contains approximately 121 calories . So, if you’re eating two medium bananas, you ...