As we all know bananas can come in different sizes so it is natural for 
people to think that there are different amount of calories in a banana 
depending on how big it is. In order to be as exact as possible we have 
broken down the sizes of a banana down into five different sizes.
Calories in an extra small banana:
 A banana that is between six and seven inches in length is deemed to be a
 small banana and there are 90 calories in these bananas.
Calories in a Medium banana:
 A banana that is between seven and eight inches in length is deemed to 
be a medium banana and there are 105 calories in these bananas
Large banana:
 A banana that is between eight and nine inches in length is deemed to be
 a large banana and there are 120 calories in these bananas.
Calories in an Extra Large Banana:
 A banana that is over nine inches in length is deemed to be an extra-large banana and there are 135 calories in these bananas.