Question: what is the average height to dunk a basketball?
Answer: I'd say 6'4" is a good average height for an average person to start to be able to dunk. Shorter than that and dunking equals above average vertical leap. My arm extends about 18 inches above my head. At 6' 2 1/2" that means my fingertip reaches to about 7'10" (7'11" with shoes).