The Tip.it Magick calculators are very unreliable. The calculators need to be programmed to calculate the basic hit (absolutely missing (no red splats, no blue splats) or hitting zero. You still gain experience for it). Not an average of hits. Not everybody hits the same with the spells, no matter the level/equipment/potions. It's going to be different for everybody. If you do it this way, people are going to have to make more bank runs if they only bring the amount the calculator says (which most people, if not all, will do). If you program it with the basic hit, they'll know the maximum number of runes they'll have to take in order to level up, and fewer bank runs will be made.