text: what is the average penis sizes for a 16 year old? i have a little over 7 inches but i dont know what the normal size is. is 7 inches big? for a 16 year old you are off to a good start! hang in there and give it some time.  like some guys you may get bigger and then again you may have reached your full potential  either way the average for an adult male is 6 to 7 inches.  sure there are guys with a bigger penis, but there are also a lot of guys with a smaller penis who would trade for yours in a minute.  and as anyone can tell you, it is definitely not the size that counts, it's in knowing  what you are doing with what you already have.  don't ever feel like you got cheated! take the time while you are young to explore your body and to learn your likes and dislikes so that you can communicate them to your future sex partner.  good luck!