calories in 1 banana
A small banana contains 90 calories. Photo Credit StockSolutions/iStock/Getty Images. One small banana contains 90 calories, 23 grams of carbohydrates, 1 gram of protein, 2.6 grams of fiber and less than 1 gram of fat. Additionally, it contains 362 milligrams of potassium which helps maintain the fluid balance in your body.