It's a good question. It's covered in both of the threads I link at the start, but it's also simple to answer :D so here we go:
Your chance to be missed is made up of two components. Everyone has a base chance of being missed, and an addition chance of being missed that scales with Defense. The base chance to be missed is 5%. The additional chance of being missed due to Defense is given when you mouse-over your Defense Skill on the paper-doll screen.
You can also calculate your chance of being missed due to Defense youself knowing how much Defense you have but it's not neccessary (since you can just mouse-over the Defense Skill). Here's how you'd do it manually in your case.
(Defense Skill - Base Defense) * 0.04 = Miss from Defense
Where Base Defense is 350 at level 70 (from gaining 5 every level). Every point in Defense Skill gives you 0.04% each to be Missed, Block, Dodge, Parry. So if you follow the math, what we're doing is isolating the Miss component.
(464 - 350) * 0.04 = 114 * 0.04 = 4.56%
So for you right now, you're chance to be missed is:
Base = 5.00%
Def = 4.56%
=
9.56% At exactly 490 Defense (to be uncrittable) you have 5.60% Miss from Defense, so you'd have 10.60% after you add the base miss.
If all the math is confusing, remember: you can get your %Miss from Defense just by mousing over your Defense Skill (it's the same value as crit reduction from Defense) and then the only math you have to do is adding the 5% base miss.
You:
Base Miss: 05.00
Def Miss: 04.56
Block: 14.34
Dodge: 12.42
Parry: 14.81
HS: 30.00
Libram: 05.00
----------------
( 102.40 )
Total: 86.13
================
Short: 16.27%
Meaning with Holy Shield and the Libram of Repentance up you are sitting at 86.13%, a good ways to go still. Reaching 490 Defense should be a higher priority anyway. If you dont have the Libram of want to see it without Holy Shield, just remove those lines.
Edited, Aug 8th 2008 12:36pm by Losie