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Spell power coefficient - WoWWiki - Your guide to the World of Warcraft

Spell power - WoWWiki - Your guide to the World of Warcraft

Direct Damage spells:

C = Cast Time / 3.5
Direct Heal spells:

C = (Cast Time / 3.5) * 1.88


Table of coefficients

Cast time Damage Coefficient Healing Coefficient
1.5- sec 42.86% 80.57%
2.0 sec 57.14% 107.43%
... ... ...
6.5 sec 185.71% 349.14%
7.0+ sec 200.00% 376.00%