WowAce

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A simple benchmark for tanking gear.
by Whitetooth, Cenarius server.
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Why TankPoints?
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TankPoints was created with balance in mind, mainly to help tanks balance maximum health points versus damage reduction, which at sometimes really isn't that simple.
While maximum health points are eazy and straight forward to get, damage reduction on the other hand is quite complicated, it considers armor, defense, dodge, parry, block, miss and crit reduction.

Should I choose defense gear over stamina gear? Do I want agility for dodge or extra high armor? What if I want them all?
Choosing the right gear would be much eazier if there were some sort of benchmark that takes into account all those variables and caculates one simple benchmark for us to reference in game, meet TankPoints!

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How do I use TankPoints?
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Installation:
Its the same as any other addon, just download the zip file, decompress the "TankPoints" folder into "World of Warcraft\Interface\Addons\", overwrite all if needed.

Using TankPoints:
After you log into WoW, press "c" to open your Character frame, if TankPoints is properly installed you should see your TankPoints displayed above your stats.
Mouse over to show more detailed information.
As shown in the screenshot: http://www.curse-gaming.com/modscreens.php?id=3274
Everytime you change your gear TankPoints will update and show the changes.

Using TankPoints Calculator:
What if you want see how much TankPoints you would have with enchants or gear that you do not own yet?
This is where the TankPoints Calculator comes to use.
Click on your TankPoints to show the Calculator:
http://www.curse-gaming.com/modscreens.php?id=3275


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How is TankPoints caculated?
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For those interested, this is a detailed discription of how TankPoints are calculated, the math behind TankPoints.

ArmorReductionTemp = Armor/((85*PlayerLevel)+400)
ArmorReduction = ArmorReductionTemp/(ArmorReductionTemp+1)
CritReduction = (Defense-PlayerLevel*5)*0.04*0.01
MobCrit = max(0,0.05-CritReduction);
TotalReduction = 1-[(mobCrit*2+(1-mobCrit-mobMiss-dodge-parry))*(1-ArmorReduction)*stanceModifier]

TankPoints = MaxHealthPoints/(1-TotalReduction)

The physical meaning behide TankPoints is the raw amount of damage you can take without any healing, which takes into account MaxHP, Armor, Defense, Dodge and Parry.

Note: Block is a more complicated variable that depends on how hard and how often a mob hits and personal skills, thus is not considered in this benchmark.

Resistances:
SpellReduction% = 75 * min(resistance, PlayerLevel * 5) / (PlayerLevel * 5)
ResistTankPoints = MaxHealthPoints / (1 - SpellReduction%)


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Reference
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-- Stamina --
* +1 Stamina = +10 max health points(max HP).
* Taurens get 5% bonus HP from stamina but not from +health enchants.

-- Agility --
* Increases Armor Class by 2 for every point of AGI.
* Increases the chance of a critical hit with melee and ranged attacks. The amount of the increase is dependant on both class and level. For most level 60 character classes, approximately 20 points of AGI will increase your critical hit chance by approximately 1%. Rogues require 29 AGI for an additional 1% critical hit chance, and Hunters require 53 AGI for an additional 1% critical hit chance, but both of these classes also gain attack power from agility and the items available to them typically have much higher amounts of AGI.
* Increases the chance to dodge an attack. The amount increased is dependant on both class and level. For most level 60 character classes, approximately 20 points of AGI will increase your chance to dodge by approximately 1%. Rogues only require 14.5 AGI for an additional 1% dodge chance. Hunters require 26.5 AGI for an additional 1% dodge chance, but Hunters typically have a high amount of agility, as well as an Aspect spell that further increases their chance to dodge attacks.

-- Armor --
* Warrior protection talent: Toughness only effects armor gained from item, does not effect armor gained from buffs, enchants and armor kits.

-- Defense --
a brief explanation on how the defense skill works currently in patch 1.6:

# Increases the chance of being missed by an attack.
Each point of defense will increase the chance of being missed by an attack from an even con NPC by .04%

# Increases the chance to dodge, parry, and block an attack.
Each point of defense will increase the chance you will dodge, parry, or block an attack by .04% for each category

# Decreases the chance of being affected by a critical hit.
Each point of defense will decrease the chance of being affected by a critical hit by .04%

# Decreases the chance of being affected by a Crushing Blow.
Each point of defense will decrease the chance of being affected by a Crushing Blow by 2%. The benefit defense will have on a Crushing Blow is limited by your level. In other words, increasing your defense will only reduce the chance of being struck by a crushing blow if your current defense value is below your level