I was wondering how much bigger can I get I have a 2-3 flaccid penis in when erected 5-6 I'm 15 years old I have armpit hair in I have pub hair too I'm some that's on my legs will my penis grow
Your size now is considered average for an adult.
Since you are 15 you still could see some growth by how much or when it will happen is hard to say penis growth can happen as late as 20 years of age but that does not necessarily mean penis growth will happen until that age for everyone.
There is no guarantee that you will get a lot bigger but some growth could certainly happen yet.
If you search for the Tanner puberty scale and do the quiz it will tell you what stage of puberty you are in along with provide you information on growth and development.
Your size now is fine and it sounds like you are developing just as you should be.