Found this macro over at WoWWiki
It will tell you if you are uncrushable ot not, and also tell how far you are from being it.
/script DEFAULT_CHAT_FRAME:AddMessage("Need 102.4 combined avoidance. Currently at:",0.8,0.8,1)
/script DEFAULT_CHAT_FRAME:AddMessage(GetDodgeChance()+GetBlockChance() + GetParryChance() +5+(GetCombatRatingBonus(CR_DEFENSE_SKILL) + 20)*0.04,1,0.5,0)
If you dont have 5/5 anticipation you have to edit the "(CR_DEFENSE_SKILL) + 20)" part to whatever fits.
try to use it both with and without Shield Block.
Just thought i would share this
![Smiley: smile](http://zam.zamimg.com/i/smilies/smile.gif)