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Cooldown reduction icon.png Ability Haste (AH) is a statistic that represents cooldown reduction, particularly cooldown of champion abilities. It is distinct from other versions of haste such as summoner spell haste and item haste, which are not visibly tracked in game. This article will discuss all forms of haste for the topic of cooldown reduction.

Ability Haste can be acquired by items, buffs buffs, and runes runes; it also Additive stacking icon.png stacks additively.

The reduced cooldown is determined at the moment an ability is activated. Increasing or decreasing ability haste while the skill is on cooldown will not affect the cooldown.

Gold Value ​​​

  • Ability haste has a gold value of 26.67 Gold 26.67 per point.

Types and Application

The type of haste affects various cooldowns:

Ability haste does not apply to the following:


The formula for an ability cooldown (which can be extended for other haste) is:

Conceptually, every 1 AH equals 1% more ability casts, or 1% faster cooldown. The formula translates the stat into a multiplier for the base cooldown, such that 100% increase (or 1 extra cast) at 100 AH renders a x0.5 multiplier, or 50% of the cooldown.

Alternatively, cooldown reduction can be calculated with the formula:

Ability Haste on a champion is capped at 500 AH, equal to reducing one's cooldowns by 83.3%. This value is well beyond what is normally possible to acquire in a game.

Scaling with ability haste

Increasing ability haste


This table is automatically generated based on the data from Module:ItemData/data.

Aegis of the Legion Aegis of the Legion1500 1500 Gold10All maps
Anathema's Chains Anathema's Chains2500 2500 Gold20All maps
Bandleglass Mirror Bandleglass Mirror950 950 Gold10All maps
Banshee's Veil Banshee's Veil2600 2600 Gold10All maps
Black Cleaver Black Cleaver3100 3100 Gold25All maps
Caulfield's Warhammer Caulfield's Warhammer1100 1100 Gold10All maps
Ceaseless Hunger Ceaseless Hunger3300 3300 Gold25All maps
Chempunk Chainsword Chempunk Chainsword2600 2600 Gold15All maps
Chemtech Putrifier Chemtech Putrifier2300 2300 Gold20All maps
Cosmic Drive Cosmic Drive3000 3000 Gold20All maps
Death's Dance Death's Dance3100 3100 Gold15All maps
Deicide Deicide3300 3300 Gold25All maps
Divine Sunderer Divine Sunderer3300 3300 Gold20All maps
Draktharr's Shadowcarver Draktharr's Shadowcarver3200 3200 Gold25All maps
Dreamshatter Dreamshatter3300 3300 Gold25All maps
Duskblade of Draktharr Duskblade of Draktharr3200 3200 Gold20All maps
Essence Reaver Essence Reaver2800 2800 Gold20All maps
Eternal Winter Eternal Winter3200 3200 Gold25All maps
Everfrost Everfrost3200 3200 Gold20All maps
Eye of Luden Eye of Luden3200 3200 Gold25All maps
Fiendish Codex Fiendish Codex900 900 Gold10All maps
Forgefire Crest Forgefire Crest3200 3200 Gold25All maps
Frostfire Gauntlet Frostfire Gauntlet2800 2800 Gold20All maps
Frozen Heart Frozen Heart2500 2500 Gold20All maps
Gargoyle Stoneplate Gargoyle Stoneplate3300 3300 Gold15All maps
Glacial Buckler Glacial Buckler900 900 Gold10All maps
Goredrinker Goredrinker3300 3300 Gold20All maps
Guardian's Blade Guardian's Blade950 950 Gold15Howling Abyss
Hextech Rocketbelt Hextech Rocketbelt3200 3200 Gold15All maps
Icathia's Curse Icathia's Curse3200 3200 Gold20All maps
Imperial Mandate Imperial Mandate2500 2500 Gold20All maps
Infinity Force Infinity Force3333 3333 Gold25All maps
Ionian Boots of Lucidity Ionian Boots of Lucidity950 950 Gold20All maps
Kindlegem Kindlegem800 800 Gold10All maps
Knight's Vow Knight's Vow2300 2300 Gold10All maps
Liandry's Anguish Liandry's Anguish3200 3200 Gold20All maps
Liandry's Lament Liandry's Lament3200 3200 Gold25All maps
Locket of the Iron Solari Locket of the Iron Solari2500 2500 Gold20All maps
Lost Chapter Lost Chapter1300 1300 Gold10All maps
Luden's Tempest Luden's Tempest3200 3200 Gold20All maps
Manamune Manamune2900 2900 Gold15All maps
Maw of Malmortius Maw of Malmortius2800 2800 Gold15All maps
Mikael's Blessing Mikael's Blessing2300 2300 Gold15All maps
Moonstone Renewer Moonstone Renewer2500 2500 Gold20All maps
Muramana Muramana2900 2900 Gold15All maps
Navori Quickblades Navori Quickblades3400 3400 Gold30All maps
Night Harvester Night Harvester3200 3200 Gold15All maps
Prowler's Claw Prowler's Claw3200 3200 Gold20All maps
Randuin's Omen Randuin's Omen2700 2700 Gold10All maps
Ravenous Hydra Ravenous Hydra3300 3300 Gold20All maps
Redemption Redemption2300 2300 Gold15All maps
Reliquary of the Golden Dawn Reliquary of the Golden Dawn2500 2500 Gold25All maps
Riftmaker Riftmaker3200 3200 Gold15All maps
Rimeforged Grasp Rimeforged Grasp2800 2800 Gold25All maps
Sandshrike's Claw Sandshrike's Claw3200 3200 Gold25All maps
Seat of Command Seat of Command2500 2500 Gold25All maps
Serylda's Grudge Serylda's Grudge3200 3200 Gold20All maps
Shurelya's Battlesong Shurelya's Battlesong2500 2500 Gold20All maps
Shurelya's Requiem Shurelya's Requiem2500 2500 Gold25All maps
Spirit Visage Spirit Visage2900 2900 Gold10All maps
Starcaster Starcaster2500 2500 Gold25All maps
Stridebreaker Stridebreaker3300 3300 Gold20All maps
Sunfire Aegis Sunfire Aegis3200 3200 Gold20All maps
Trinity Force Trinity Force3333 3333 Gold20All maps
Turbo Chemtank Turbo Chemtank2800 2800 Gold20All maps
Turbocharged Hexperiment Turbocharged Hexperiment2800 2800 Gold25All maps
Umbral Glaive Umbral Glaive2400 2400 Gold15All maps
Upgraded Aeropack Upgraded Aeropack3200 3200 Gold20All maps
Vespertide Vespertide3200 3200 Gold20All maps
Vigilant Wardstone Vigilant Wardstone1100 1100 Gold15Summoner's Rift, Nexus Blitz
Warmog's Armor Warmog's Armor3000 3000 Gold10All maps
Watchful Wardstone Watchful Wardstone1100 1100 Gold10Summoner's Rift, Nexus Blitz
Youmuu's Ghostblade Youmuu's Ghostblade2900 2900 Gold15All maps
Zeke's Convergence Zeke's Convergence2400 2400 Gold20All maps
Zhonya's Hourglass Zhonya's Hourglass2600 2600 Gold10All maps

Item passives


Neutral Buffs

Champion Abilities

Some champions have abilities that decrease their cooldowns by a flat amount, or by a percentage, affecting either their base cooldown or current cooldown, or some abilities can completely refresh their cooldown. Base reduction occurs before ability haste takes effect while flat reduction occurs after ability haste takes effect.

  • Depending on built-in reduction type:
    • Base (applies before AH)
    • Flat (applies after AH)
    • Percent (applies to base / current / total cooldown)
    • Refresh (cooldown is immediately reduced to 0)

Base Reduction

Flat Reduction

Percentage Reduction

Cooldown Refresh

Increasing basic ability haste

Basic ability haste stacks additively with ability haste.

Increasing ultimate haste

Ultimate haste stacks additively and is applied before ability haste.

Ultimate ability haste
None Ultimate Hunter rune.png0 Ultimate Hunter rune.png1 Ultimate Hunter rune.png2 Ultimate Hunter rune.png3 Ultimate Hunter rune.png4 Ultimate Hunter rune.png5
None 0 6 11 16 21 26 31
Cloud Dragon buff.png1 12 18 23 28 33 38 43
Cloud Dragon buff.png2 24 30 35 40 45 50 55
Cloud Dragon buff.png3 36 42 47 52 57 62 67
Cloud Dragon buff.png4 48 54 59 64 69 74 79

Increasing item haste

Item haste stacks additively. It applies to all items with cooldowns, including passives and actives. Item haste stacks additively with ability haste for the cooldowns of items that also scale with ability haste, such as Goredrinker Goredrinker and Stridebreaker Stridebreaker.

Item Haste
None Ingenious Hunter rune.png0 Ingenious Hunter rune.png1 Ingenious Hunter rune.png2 Ingenious Hunter rune.png3 Ingenious Hunter rune.png4 Ingenious Hunter rune.png5
None 0 20 26 32 38 44 50
Cosmic Insight rune.png 10 30 36 42 48 54 60

Item Haste (Equivalent in CDR)
None Ingenious Hunter rune.png0 Ingenious Hunter rune.png1 Ingenious Hunter rune.png2 Ingenious Hunter rune.png3 Ingenious Hunter rune.png4 Ingenious Hunter rune.png5
None 0% 16.67% 20.63% 24.24% 27.54% 30.56% 33.33%
Cosmic Insight rune.png 9.09% 23.08% 26.47% 29.58% 32.43% 35.06% 37.5%

Increasing summoner spell haste

Summoner spell haste
Base cooldown ▶ 420s
Cooldown reduction icon.png Haste
12 (Ionian Boots of Lucidity item.png) 375s 267.86s 214.29s 187.5s 160.71s 80.36s N/A 17.86s
18 (Cosmic Insight rune.png) 355.93s 254.24s 203.39s 177.97s 152.54s 76.27s N/A 16.95s
30 (Cosmic Insight rune.png Ionian Boots of Lucidity item.png) 323.08s 230.77s 184.62s 161.54s 138.46s 69.23s N/A 15.38s
70 (Howling Abyss aura.png) N/A 176.47s 141.18s 123.53s 105.88s N/A 47.06s 11.76s
82 (Howling Abyss aura.pngIonian Boots of Lucidity item.png) N/A 164.84s 131.87s 115.38s 98.9s N/A 43.96s 10.99s
88 (Howling Abyss aura.pngCosmic Insight rune.png) N/A 159.57s 127.66s 111.7s 95.74s N/A 42.55s 10.64s
100 (Howling Abyss aura.pngCosmic Insight rune.pngIonian Boots of Lucidity item.png) N/A 150s 120s 105s 90s N/A 40s 10s


  • There are only two runes that can have their cooldown reduced:


  • Ability haste replaced cooldown reduction as a stat on patch V10.23. The change to an upcapped stat allows more flexibility on creating more items with cooldown reduction power.[1]

Last updated: May 25, 2021, patch V11.11

  • The highest attainable ability haste is 255.36 AH, this is equivalent to 71.86% cooldown reduction.
  • Relevant mathematics:
    • Items = 25 + 25 25 + 25 + 15 15 + 20 + 20 20 + 20 + 30 30 + 25 25 + 20 = 180 ability haste
    • Runes = 10 10 + Rune shard Ability Haste.png 8 = 18 ability haste
    • Buff = 10 10 + 20 20 = 30 ability haste
    • Ability Haste Multiplier = 1 + 0.12 0.12 = 1.12
      • Total ability haste = (180 + 18 + 30) × 1.12 = 255.36
  1. Yetter, M. (2020, August 7). Preseason 2021 Class Item Goals. leagueoflegends.com.