Runecrafting Spefiaclly for laws or Natures would be good.
Have you finished your merchanting calculator already?
No, I just thought that it's easy to just say 'I made 10k that time, so if I want 100k, I need to do that 10 times'. Do you still think I should make it then?
I'm sure some people will need that :L
anyway, this may sound hard, but try a dungeoneering xp calculator
(based mainly on number of rooms, prestige and floor)
effigy needed for certain levels etc? like 80-90 hunter = ?? effigys (and include the opening of them for xp in other skills)
Do a combat exp/ how many you have to kill and stuff.

