Cooldown Reduction (CDR & Ability Haste)
Calculate the effective cooldown of an ability from cooldown reduction or ability haste and how many casts you get per minute, free online.
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With cooldown reduction (CDR) the cooldown becomes base × (1 − CDR). With ability haste (League of Legends style) it is base × 100 ÷ (100 + haste), so each point of haste gives diminishing returns. The effective increase in casts equals the base cooldown ÷ the new cooldown.