Assume a player has 30% crit chance, and shoots you for 100 damage.

If he shoots you 100 times, you get (100x100)+(30x100)=13000 damage. (These are melee crits).

Now resilience reduces crit chance by um 15% (is this number accurate?) and crit damage by 25%.

So now he shoots you for (100x100) + (15x100x0.75) = 11125 dmg

11125/13000 = 85.58%

So if you have 492 resilience then you take 14.5% less damage?

But I think that there's something wrong with this; it seems too simple.

30% crit:
Damage*(0.7+0.3*Multiplier).
15% crit reduction, 25% dmg reduction:
Damage*(0.85+0.15*Multiplier*0.75).
Divided, assuming Multiplier=2x:
1.3/1.075~0.827: 82.7% of incomeing damage.

General formula:
                        (1-CritChanse)+CritChanse*Multiplier
--------------------------------------------------------------------------------------
(1-CritChanse+CritRdc)+(CritChanse-CritRdc)*Multiplier*(1-DmgRdc)

Accurate numbers are 12.5 critical chanse and 25% damage reduction(here come yours 85.58%). Damage reduction=2*Critical chanse reduction(up to 25% damage reduction). 1% Critical chanse reduction=39.4 Resilience rating. Taking that in account, formula becomes this:

              (1-CC)+CC*M
------------------------------------------------------
[(1-CC)+CC*M+(1-2*CC*M-M)*X+2*M*(X^2)]

X=Resilience/3940

You can get kinda the same information at wowwiki: http://www.wowwiki.com/Resilience. I suggest you to use this resource, before asking something. Just because there you can find almost everything you need to know without any delay. ;)

Thanks for helping me a 3rd time.

No problems. It seems to me, that I'm the only guy who actually cares about WoW's math here. I'd suggest Thott to close this forum section and just put a reference to wowwiki. There's enough people retarded like me@wowwiki who calculates the same shit over and over, while the only truth is: the practice owns. :S