A small banana, typically 6 to 7 inches long and around 101 grams in weight, contains approximately 90 calories. This calorie content primarily comes from carbohydrates, with a small amount from protein and fat. The exact caloric value can slightly vary depending on the banana's ripeness and size, but 90 calories is a good estimate for a small banana. References:

• Small banana (6–7 inches, 101 grams): 90 calories