Here are the numbers from the USDA food database
http://www.nal.usda.gov/fnic/foodcomp/search/ :
- extra small (less than 6") = 81
- small (6 - 6 7/8") = 101
- medium (7 - 7 7/8") = 118
- large (8 - 8 7/8") = 136
- extra-large (9" or longer) = 152
I just checked Fitday and it lists a medium banana as 108 calories, so it's slightly less than the USDA. Hmmm ... but close enough, I guess!
