The calculator is over on me, 160 pounds, 3 mil full suit and steel 80 it’s saying 10 pounds, I usually use 5 on a shallow dive and 3 deeper, with an AL80 it says 15 pounds and I use 8
So for most the calculator is probably a good starting point.
BTW, on a Roatan trip I told a woman on our boat she was carrying too much weight! Not a good move. She did start taking off a pound each dive and by the end of the week was a better diver and talking to me again :)