Formulas:Block
From WoWWiki
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Chance to Block
Your chance to Block an attack is a percentage that follows this formula:
- Block% = 5% base chance + contribution from Block Rating + contribution from talents + ((Defense skill - attacker's weapon skill) * 0.04)
Your Block Rating (introduced in patch 2.0.1) is provided by items that have a Block Rating bonus. At level 60, you gain 1% to your Block Chance for every 5 points of Block Rating. At level 70, you gain 1% to your Block Chance for every 7.8846153846 points of Block Rating, and at level 80, you gain 1% to your Block Chance for every 16.3949938950 points of Block Rating.
For example, a level 60 warrior with a Block Rating of 10, 5 points in the Shield Specialization talent, 325 Defense skill, and who was fighting level 60 mobs would have:
- Block Rating contribution = 10 / 5 = 2%
- Defense contribution = (325 - 300) * 0.04 = 1% (A mob's weapon skill is assumed to be its level * 5)
- 5% base + 2% Block Rating + 5% talents + 1% Defense modifier = 13% Block chance versus level 60 mobs
In combat, you will notice that the percentage of incoming attacks that are Blocked matches the Block percentage shown in your tooltips. Miss chance and Critical chance are unmodified by your Block chance, so you're not "wasting" Blocks on misses nor are you able to Block a Critical. This may seem odd to some folks if they are expecting a "if hit, then check if Parry, then check if Block, then check..." type system. WoW, like many other games, uses a combat results table-based combat scheme (where one roll determines outcome of an attack), so percentages are absolute.
Your parsed Block percentage won't necessarily match your tooltip if you're fighting creatures higher or lower in level to you. See the Defense formula above to understand.
Damage reduction when a block occurs
When an attack is Blocked, it does not necessarily mean that the target takes no damage. A Block attack-result inflicts the same damage as a normal hit, but reduced by an amount "X" that's based on the Block value and Strength of the target, as follows:
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Block value modifiers
Block value modifiers that increase block value by a percentage are added together as modifiers before being applied to the character's base block value.
For example, a Warrior's Shield Block skill increases block chance and value by 100%, and most tanking Warriors will also have the Shield Mastery talent (+30% block value). This is calculated in the following fashion:
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The modifier is 2.3 (230%) because the bonuses from Shield Block (100%) have been added to Shield Mastery (30%) before being applied to the base block value (100%). Temporary block value from librams, trinkets, or other items is included in the original base block value calculation, and therefore benefits from all block value modifiers.
- Notes
- The quantity of damage blocked is calculated after damage mitigation from all other sources (Armor, Defensive Stance, Improved Righteous Fury, Blessing of Sanctuary, etc.). That means if the opponent hits you for 200, mitigated to 100 by Armor, and block according to the formula above is 40, then you will see in your combat window: "... hits you for 60. (40 blocked)".
- If the block quantity is greater than the damage received after mitigation, you will then block 100% of the damage: "... attacks. You block."
- The Warrior [Glyph of Blocking] increases block value by 10% for 10 sec after using Shield Slam.
