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Combat rating system

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Combat rating is a mechanic introduced in patch 2.0.1 which are for combat stats on items that were previously percentage based; rating is converted to percentage based on values that Blizzard chooses. Ratings were introduced because percentage based itemization would have scaled excessively when The Burning Crusade was released and the player cap rose to 70.

Combat rating types

The following combat ratings are currently in use:

The following combat ratings have been deprecated[1] and are no longer in use:

Combat skills

See also: Critical strikeSpell critical strike

Unlike fixed percentages such as 2% critical strike chance, combat ratings diminish in potency as your character increases in level. 2% crit is the same at every level, while 28 critical strike rating grants 4% crit at level 34, 2% crit at level 60, and 1.27% crit at level 70. This allows Blizzard the ability to create and add new and better items to the world without eventually reaching a point where every character has a 100% chance to critically strike.


Below are the conversion for level 60, level 70, and level 80 combat skills:

Rating Effect Requires
Level 60 Level 70 Level 80
Expertise -1% Dodge/Parry 10 15.77 32.79
Melee Hit 1% hit chance 10 15.77 32.79
Spell Hit 1% spell hit chance 8 12.62 26.23
Critical Strike 1% critical strike chance 14 22.08 45.91
Haste 1% haste 10 15.77 32.79
Armor Penetration 1% armor ignored 3.75 5.92 12.31

Prior to patch 2.0.1, Weapon Skill reduced the percentage of damage lost due to glancing blows.

Between patch 2.0.1 and patch 2.3, Weapon Skill gave player +0.1% to their critical strike rating per weapon skill against monsters above their level.

As of patch 2.3, all items which previously had Weapon Skill Rating or Feral Combat Rating now have an equal amount of Expertise Rating.

From the 2.3 PTR patch notes: "We have added a new stat and associated rating called expertise and expertise rating. Expertise rating converts to expertise at the same rate that weapon skill rating formerly converted at. Each point of expertise reduces the chance for your attacks to be dodged or parried by 0.25%."

Patch 3.1 increased the effectiveness of armor penetration rating by 25%.

Unlike Weapon/Feral Combat Rating, Expertise does not have diminishing returns beyond 20 rating. For players, this means that once the hit cap has been reached, one can begin stacking Expertise to increase damage potential against mobs with high dodge/parry. Melee DPS classes won't benefit much from the -parry (as they should be behind the target), however dodges do make up a considerable chunk of lost damage. Druid tanking items with Expertise, such as Earthwarden, will be more valuable for consistent threat generation since a parried/dodged Mangle can be devastating.

Since Expertise is 'capped' by the target's chance to dodge/parry, the ideal rating varies per mob. The average level 73 boss has a 6.5% chance to dodge. Completely negating a 6.5% chance to dodge would require 102 Expertise rating at level 70, assuming the character had no talents which reduced his target's dodge chance.

Defense skills

The impact on the defense skill system is slightly more complicated. This skill actually grants a percentage-based benefit already; every 25 points of defense skill grants a 1% dodge chance, 1% parry chance, 1% block chance, 1% increased chance to be missed and 1% decreased chance to be critically hit by physical attacks.

Below are the defense rating values needed to achieve 1% of each effect:

From Patch 2.1 through Patch 3.1.3

Rating Effect Requires
Level 60 Level 70 Level 80
Defense Skill 1 defense skill 1.5 2.37 4.92
Defense Skill 1% combined miss/dodge/parry/block 9.375 14.8125 30.75
Defense Skill 1% combined miss/dodge/parry 12.5 19.75 41
Dodge 1% dodge 12 18.92 39.35
Parry* 1% parry 15 23.65 49.18
Block 1% block chance 5 7.88 16.39
  • Parry was changed in the 2.1 patch to require 25% less rating to equal 1% Parry. The old value at 70 was 31.54 rating for 1%.

From Patch 3.2 onward

Rating Effect Requires
Level 60 Level 70 Level 80
Defense Skill 1 defense skill 1.5 2.37 4.92
Defense Skill 1% combined miss/dodge/parry/block 9.375 14.8125 30.75
Defense Skill 1% combined miss/dodge/parry 12.5 19.75 41
Dodge 1% dodge 13.8 21.76 45.25
Parry 1% parry 13.8 21.76 45.25
Block 1% block chance 5 7.88 16.39

All of these Ratings have the same "point cost" when determining the level of an item. (See the article on Item values for an in-depth discussion.) For comparison, 1 point of Block Value, which decreases the damage taken when a block occurs by 1, costs 0.65 as much as 1 point of any of these Ratings.

Resilience

See also: Resilience

Resilience reduces the effects of all types of critical hits (both physical and spell crits from players or mobs). Resilience has three components; it reduces the chance you will be critically hit by x%, and it reduces the damage dealt to you by crits that land by 2x% and finally reduces all pet- and player-caused damage by an additional x%. x is the percentage resilience granted by a given resilience rating. In 2.4 an additional effect was added to resilience. It reduces the amount of mana drained or burned by mana draining effects by 2x%.

PvE tanks usually have high enough +defense values so that mobs won't crit them at all, thus in PvE this is not an important statistic.

Resilience Crit chance Crit damage Player damage Mana drain reduction Rating required
Level 60 Level 70 Level 80
1% - 1% - 2.2% - 1% - 2.2% 25 39.4 82.0
2% - 2% - 4.4% - 2% - 4.4% 50 78.8 163.9
3% - 3% - 6.6% - 3% - 6.6% 75 118.2 245.9

Historical Note: Prior to Patch 3.0, the Survival of the Fittest feral druid talent only reduced the druid's chance to be crit by 3% at most. Thus, for druid tanks, resilience could actually be more useful than defense to reach crit immunity (with the talent, a raid boss's crit chance at level 70 was 2.6% before Defense Rating or Resilience was applied). This is no longer true as of patch 3.0, where druids can become completely immune to crits from mobs though SotF alone, without defense or resilience. The formulas below are still valid if you don't have 3/3 of this talent.

For a level 70 druid:

60 defense rating = (-1%crit,+1%miss,+1%dodge,+1%parry,+1%block)
39.4 resilience rating = (-1%crit,-2%crit damage)
14.7 agi = (+1%dodge,+0.58%crit,+29.4 armor)

The conclusion is that if your goal is to become a crit-immune druid, you can swap 60 defense rating for 39.4 resilience rating + 29.4 agi. This is because (1%miss and 1%dodge) = 2%dodge, see also Attack Table for this. So this trade off gives you the same crit immunity and gives even slightly better damage mitigation because of the use of Agility. This trade-off is also good for the extra crit and armor, which are both useful for feral tanks. Looking at normal stats of defense rating and resilience on armor and weapons, it is easier to get crit immunity through resilience than through defense. This is not true for Warriors and Paladins as they can Block and Parry and therefore get much more benefit from defense rating than feral druids.

Leveling

Each time you go up a level, the amount of rating needed to get the same benefit will increase. An example of the scaling involved would be the current implementation of Agility which has always worked this way in the live game, requiring more agility for the same critical strike chance as you go up in level.

Diminishing returns

As of patch 3.0.2, combat ratings that affect avoidance stats now have diminishing returns.

Combat Ratings formula

See also: Melee mitigation

The following formulas give the amount of rating required to achieve a 1% bonus. They can be derived from two sources, the values stored in the client and extensive testing done by the author of the Rating Buster addon, and are completely accurate (each method gives the same values within the margin of error for 32-bit floating point precision, or 10^-7).

Values are calculated with below formulas:
Ratings graph

Ratings Conversion Graph

Resilience,Hit,Critical Strike,
Haste,Expertise,Armor Penetration
Dodge (Patch 2.1),
Defense,Parry,Block (Patch 2.4.2)
LEVEL FORMULA LEVEL FORMULA
1-10 \frac{base}{26} 1-34 \frac{base}{2}
10-60 base\frac{level-8}{52} 34-60 base\frac{level-8}{52}
60-70 base\frac{82}{262-3level} 60-70 base\frac{82}{262-3level}
70-80 base\frac{41}{26}\left(\frac{131}{63}\right)^\frac{level-70}{10} 70-80 base\frac{41}{26}\left(\frac{131}{63}\right)^\frac{level-70}{10}

The 70-to-80 formula may change in future patches, but is current as of Patch 3.0.3.9183 (verified Dec 2, 2008)[2].

Rating Combat variable Base
(value at lvl 60)
Armor Penetration - % of target's armor 3.756097412
Block + % block chance 5
Critical Strike + % melee crit chance 14
+ % ranged crit chance
+ % spell crit chance
Defense + defense skill 1.5
Dodge + % dodge chance 12
Expertise + melee weapon skill 2.5
Haste - melee weapon speed(1)(2) 10(3)
- ranged weapon speed(1)
- cast time
Hit - % melee miss chance 10
- % ranged miss chance
- % spell miss chance 8
Parry + % parry chance 15
Resilience - % chance to recieve melee crit 25
- % chance to receive ranged crit
- % chance to receive spell crit
- % melee crit dmg taken 11.36363636
- % ranged crit dmg taken
- % spell crit dmg taken
- % DoT dmg taken 25
- % mana drained 11.36363636

1) "-" is here because the variable that Blizzard calls speed is actually the period between two swings/shoots. Actual speed is increased.

2) Paladins, Shamans, Druids and Death Knights receive 30% extra value for this stat (effective base value is 13)

3) Unlike the other ratings, Haste Rating → Speed/Cast time conversion isn't linear; see Haste

Ratings calculators

Ingame

  • Rating Buster, an addon which shows and calculates Combat ratings on your items (Curse | WoWInt).

Historical note

Prior to version 2.0.1, item bonuses didn't use the Combat Ratings System. Instead, items had equip and on-use bonuses that increased the underlying value directly. For example, instead of increasing the wearer's Crit Rating by 14 and the wearer's Dodge Rating by 12, the old pre-2.0.1 Stormshroud Shoulders added +1% to the wearer's Crit chance and +1% to the wearer's Dodge chance.

When Blizzard made the conversion to 2.0.1, all existing items with the old +crit%, +defense, etc. values were converted to their equivalent values in the new Ratings system scaled for a level 60 character. For example, an item that previously gave +10 Defense Skill now gives +15 Defense Rating. (Conversions that would have resulted in a fractional Rating were rounded down to the nearest whole number; e.g. an item that previously gave +3 Defense Skill now gives +4 Defense Rating.)

See also

References

  1. ^ Patch 3.0.2
  2. ^ Whitetooth 2008-12-02. Combat Ratings at level 80. Elitist Jerks. Retrieved on 2008-12-04.

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