There is no minimum height you need to be to slam dunk although, obviously, the taller one is the easier it is to do it. The smallest person I have seen slam dunk is former NBA player Spud Webb who won the NBA slam dunk competition at the 1986 All Star Game. Webb was 5 feet 7 inches (1.70 meters) tall.
Click on the 'Spud Webb Dunking' link below to see highlights from the 1986 NBA Slam Dunk contest
6'1 or under---You can't
6'2-6'3---Maybe you can, but if you are 6'2, most likely not (You have to jump really high)
6'4---You can possibly dunk, with a little bit of strength
6'5---You can dunk properly
6'6---You can dunk like Kobe Bryant, but not like Shaq at 7'1
6'7 or higher---You could dunk like nothing!
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There really isn't a height restriction, it's all about how high you can get yourself to jump. Strength in all of the leg muscles and knowing the right way to approach a dunk can help any-sized person.
You could be really tall but not be able to dunk while you could be really short but have a lot of jumping ability and can dunk.
i am 10 i am "5 3' and am 120 i can almost dunk a 8 footer so i would say 5'8 but im going through a growth spurt.
You should be able to dunk at 5 feet 10 inches tall. This, however, is a good height but it's not a rule. Remember, Spud Webb was extremely short, however, he was able to dunk.
No minimum height applies, its all dependent on the height of your vertical jump