Originally Posted by Diagnostics
Since the release of WOTLK mana costs are based off a percentage of your total mana pool. Just take your total mana and divide it by your spell cost.... Atleast thats what I do as a healer to know I can cast Healing Wave, Lesser Healing Wave, Chain Heal x amount of times. Of course this does not include mp5 and regen trinkets, riptide crits, buffs, mana tide, and 4 piece t10 bonus.
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Base mana, not total mana.
http://www.wowwiki.com/Base_mana