Attack power coefficient

Some abilities scale with attack power. These are generally damaging abilities, however there are exceptions. An attack power coefficient is a ratio representing the rate at which attack power is converted to bonus damage (or something else, such as Anti-Magic Zone's damage prevention or Shamanistic Rage's mana gain), for example an ability with an attack power coefficient of 20% would receive 1 bonus damage per 5 points of attack power.

Death Knight coefficients
Source: Tankspot.

Druid coefficients
Sources: Wowhead, Thottbot.

Hunter coefficients
All abilities use ranged attack power unless otherwise specified

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Hunter pet coefficients
Sources: rawr 2.2.19 source code

Hunter conversion values do not include the effects of the Wild Hunt pet talent.

Paladin coefficients
Many paladin abilities receive bonus damage from both attack power and spell power. Additionally, the retribution talent Sheath of Light causes 30% of attack power to be gained as spell power, indirectly increasing the effectiveness of all spells.

Rogue coefficients
All abilities use melee attack power.

Source:.

Shaman coefficients
The enhancement talent Mental Quickness causes 30% of attack power to be gained as spell power, indirectly increasing the effectiveness of all spells.

Warrior coefficients
All abilities use melee attack power.

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Racial ability coefficients

 * 1) A single casting of Gift of the Naaru does not receive bonus healing from both attack power and spell power, instead, each casting uses the higher of the two bonuses.