Hi Stev I found a mistake with your calculator. This is still regarding with the prayer and summoning part of the formula. Using an account with 99 range, def, hp and summon but with 95 prayer it says 2 levels in summon/prayer needed to get next level. Yet with 96 prayer you have max combat. I'm assuming the same error can be replicated by having 99 prayer and 95/96 summoning. Apart from this I have found it to be flawless. Great work!