To calculate the percentage of your hits that will actually end up as critical hits including the critical chain rule, please enter your critical ratio (alt+c) in decimal syntax, with, for example 39% being entered as 0.39.
Critrate:
Critical Ratio: 13%
Effektive Probability of critical hits including the chaining rule: 19.636083076153%.
Formula used: (x+1.8x+1.56x) / (x+1.4x+1)
x = critical ratio as entered above.
Explanation: http://rappelz-forum.gpotato.com/viewtopic.php?f=437&t=996709