How much will my penis grow by the time I'm 18?

Male genitals usually reach their adult size around age 16. The average adult erect size is 5.1 inches. That makes you considerably larger than average even for an adult right now. And yes, you may grow more.

Well I can only talk about it in a personal manner but I'm in the same state of questioning I have a 7 to 7 1/2 in. Penis and I'm 16 so you might grow more but I don't know after 16 years old

I'll bet you a donut and a cup of coffee, your penis is done growing. 6 1/2" is above normal right now and to grow bigger is more of a handicap than an asset.

You're way above average. Your penis probably wont grow very much more. I'm 17.5 years old and still wanting it to grow more. You can continue to grow up until early 20s.

Its stops growing usually by age 16 or earlier. Once a boy reaches sexual maturity, his gentitalia stops growing. That usually happens by 16.

Its possible that you already peaked in size. Since your already ahead of most grown men.

it actually can be uncomfortable for girls sometimes with a guy who has like a huge penis. 6 1/2 is pretty big, you'll do fine lol

Im going to say your full of BS and that your penis is 3.25 in and you 2x it