You can't make a completely accurate hitpoints calculater because there are ways to raise skills without getting hitpoints exp. Such as genie lamps, cannons, and all the spells that don't do damage.
Im in: Chef's Guild Champion's Guild Crafter's guild The Monastery Hero's Guild Fishing Guild (I'm there right now) Mining Guild and Ranger's Guild So Legend's Guild and Magic Guild are the only ones I can't get into.