Ok, sorry guys I wasnt clear, looking back at it now. I had to walk away from my ocde for the day lol...
SIZ (size)
CON (constitution)
SIZ_CON = SIZ + CON;
Total of SIZ_CON determines hit points.
50 hitpoints is alot in this game. SO basically, for every 5 points of SIZ_CON over total of 40 SIZ_CON is only +1 hit point.

Thanks Walori, I'm looking at a counter.