Blocking % in Classic: Characters block at the % listed on the shield (when equipped) + any other bonuses. Total blocking is capped at 75%. A character can get more than this with a good shield + Twitchthroe, or a Paladin can use his Holy Shield skill, but no matter how high the display is, 75% is all that can be blocked. This is while standing still, running, walking, fighting, casting spells, etc.
Blocking % in the Expansion: The way blocking works is changed in the expansion. The new formula for blocking is:
- Total Blocking % = [Blocking x (Dexterity – 15)] / (Character Level x 2)
This formula basically means that if you have less than half of your stat points into Dexterity, you will have a lower block rating than your shield displays, but if more than half of your stat points are in Dex, then you will have a higher blocking %. Blocking is capped at 5% minimum and 75% maximum and displays if you hover on your Defense in the Character window. Sorcs and Necros will almost always be blocking at 5% past Clvl 50, so should pick shields based on their magical bonuses, not for the blocking percent.
- Blocking is reduced to 33% of this value when running, but uses regular values when walking, standing still, or melee attacking.