Ability Haste Calculator

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Fact Checked by David Chen, CFA • Updated Oct 24, 2023

Optimize your gameplay by calculating exactly how much Ability Haste affects your cooldowns. Our Ability Haste Calculator helps you understand the diminishing returns of CDR and plan your item builds efficiently.

Ability Haste Calculator

Please enter a valid base cooldown.
Please enter a valid ability haste value.
New Cooldown 0.00s
Cooldown Reduction (CDR) 0.00%

Ability Haste Calculator Formula

New Cooldown = Base Cooldown × (100 / (100 + Ability Haste))

Formula Source: League of Legends Wiki – Ability Haste Mechanics

Variables:

  • Base Cooldown: The original cooldown time of the ability in seconds before any haste is applied.
  • Ability Haste: A stat that increases how frequently you can use abilities. Unlike the old CDR system, Ability Haste scales linearly.
  • New Cooldown: The resulting time you must wait between ability uses after haste is applied.

Related Calculators

What is Ability Haste?

Ability Haste is a modern stat used in many competitive games to replace the traditional “Cooldown Reduction” (CDR) percentage. The primary goal of Ability Haste is to allow for linear scaling of power. In the old system, 10% CDR was more valuable if you already had 30% than if you had 0%.

With Ability Haste, every point provides the same relative increase in “casts per minute.” For example, 100 Ability Haste allows you to cast your abilities 100% more frequently (twice as often), which is equivalent to 50% CDR.

How to Calculate Ability Haste (Example)

  1. Identify your Base Cooldown (e.g., 60 seconds for an Ultimate).
  2. Check your total Ability Haste from items, runes, and buffs (e.g., 50 Haste).
  3. Divide 100 by (100 + your Haste): 100 / (100 + 50) = 0.6667.
  4. Multiply the Base Cooldown by this factor: 60 × 0.6667 = 40 seconds.
  5. The New Cooldown is 40 seconds.

Frequently Asked Questions (FAQ)

Is there a cap on Ability Haste?

Unlike CDR (which was usually capped at 40% or 45%), Ability Haste typically has no hard cap, though it does have diminishing returns regarding the total percentage of time reduced.

How does 50 Haste compare to CDR?

50 Ability Haste is equivalent to approximately 33.3% Cooldown Reduction.

Does Ability Haste affect summoner spells?

Usually, standard Ability Haste only affects basic and ultimate abilities. Summoner spells often require a specific stat called “Summoner Spell Haste.”

Why did games switch to Haste?

Games switched to avoid the “exponential” scaling of CDR, where approaching 100% CDR would essentially break the game balance.

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