Ability haste

 Ability Haste (AH) is the 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, those of 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 granted by items, buffs, and runes; it also 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.

Types and Application

The type of haste affects various cooldowns:

• Ability haste: Champion ability cooldowns (e.g. Lucian's Piercing Light).
• Item haste: Item cooldowns (e.g. Locket of the Iron Solari or Guardian Angel).
• Summoner spell haste: Summoner spell cooldowns (e.g. Flash).

Ability haste does not apply to the following:

• Static cooldowns (e.g. Anivia's Rebirth).
• On-target Cooldowns (e.g. Jarvan IV's Martial Cadence), though there are exceptions.
• Interrupted Durations (e.g. Garen's Perseverance).
• Rune cooldowns.

Formula

The formula for an ability cooldown is:

$\pagecolor {Black}\color {White}{\rm {Reduced\ cooldown}}={\rm {Base\ Cooldown}}\times {100 \over 100+{\it {Ability\ Haste}}}$

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:

• Cooldown reduction = 1 − (1 ÷ (1 + (Ability haste ÷ 100)))

Gold Value ​​​

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

Scaling with ability haste

• Cosmic Drive
• Goredrinker ( Ceaseless Hunger)
• Ironspike Whip
• Stridebreaker ( Dreamshatter)

Increasing ability haste

Items

Item	Cost	Amount	Availability
Aegis of the Legion Aegis of the Legion	1500	10	All maps
Bandleglass Mirror Bandleglass Mirror	950	10	All maps
Banshee's Veil Banshee's Veil	2500	10	All maps
Black Cleaver Black Cleaver	3300	25	All maps
Caulfield's Warhammer Caulfield's Warhammer	1100	10	All maps
Ceaseless Hunger Ceaseless Hunger	3300	25	All maps
Chempunk Chainsword Chempunk Chainsword	2700	15	All maps
Chemtech Putrifier Chemtech Putrifier	2300	15	All maps
Cosmic Drive Cosmic Drive	3000	30	All maps
Death's Dance Death's Dance	3100	15	All maps
Deicide Deicide	3300	25	All maps
Divine Sunderer Divine Sunderer	3300	20	All maps
Draktharr's Shadowcarver Draktharr's Shadowcarver	3200	25	All maps
Dreamshatter Dreamshatter	3300	25	All maps
Duskblade of Draktharr Duskblade of Draktharr	3200	20	All maps
Essence Reaver Essence Reaver	2900	20	All maps
Eternal Winter Eternal Winter	3400	25	All maps
Everfrost Everfrost	3400	20	All maps
Eye of Luden Eye of Luden	3400	25	All maps
Fiendish Codex Fiendish Codex	900	10	All maps
Forgefire Crest Forgefire Crest	3200	20	All maps
Frostfire Gauntlet Frostfire Gauntlet	3200	15	All maps
Frozen Heart Frozen Heart	2700	20	All maps
Gargoyle Stoneplate Gargoyle Stoneplate	3300	15	All maps
Glacial Buckler Glacial Buckler	900	10	All maps
Goredrinker Goredrinker	3300	20	All maps
Guardian's Blade Guardian's Blade	950	15	Howling Abyss
Hextech Rocketbelt Hextech Rocketbelt	3200	15	All maps
Icathia's Curse Icathia's Curse	3200	20	All maps
Imperial Mandate Imperial Mandate	2500	20	All maps
Infinity Force Infinity Force	3333	25	All maps
Ionian Boots of Lucidity Ionian Boots of Lucidity	900	20	All maps
Kindlegem Kindlegem	800	10	All maps
Knight's Vow Knight's Vow	2300	10	All maps
Liandry's Anguish Liandry's Anguish	3400	20	All maps
Liandry's Lament Liandry's Lament	3400	25	All maps
Locket of the Iron Solari Locket of the Iron Solari	2500	20	All maps
Lost Chapter Lost Chapter	1300	10	All maps
Luden's Tempest Luden's Tempest	3400	20	All maps
Manamune Manamune	2900	15	All maps
Maw of Malmortius Maw of Malmortius	3100	15	All maps
Mikael's Blessing Mikael's Blessing	2300	15	All maps
Moonstone Renewer Moonstone Renewer	2500	20	All maps
Muramana Muramana	0	15	All maps
Navori Quickblades Navori Quickblades	3400	30	All maps
Night Harvester Night Harvester	3200	15	All maps
Prowler's Claw Prowler's Claw	3200	20	All maps
Randuin's Omen Randuin's Omen	2700	10	All maps
Ravenous Hydra Ravenous Hydra	3300	20	All maps
Redemption Redemption	2300	15	All maps
Reliquary of the Golden Dawn Reliquary of the Golden Dawn	2500	25	All maps
Riftmaker Riftmaker	3200	15	All maps
Rimeforged Grasp Rimeforged Grasp	3200	20	All maps
Sandshrike's Claw Sandshrike's Claw	3200	25	All maps
Seat of Command Seat of Command	2500	25	All maps
Serylda's Grudge Serylda's Grudge	3400	20	All maps
Shurelya's Battlesong Shurelya's Battlesong	2500	20	All maps
Shurelya's Requiem Shurelya's Requiem	2500	25	All maps
Spirit Visage Spirit Visage	2900	10	All maps
Starcaster Starcaster	2500	25	All maps
Stridebreaker Stridebreaker	3300	20	All maps
Sunfire Aegis Sunfire Aegis	3200	15	All maps
Trinity Force Trinity Force	3333	20	All maps
Turbocharged Hexperiment Turbocharged Hexperiment	3200	20	All maps
Turbo Chemtank Turbo Chemtank	3200	15	All maps
Umbral Glaive Umbral Glaive	2800	15	All maps
Upgraded Aeropack Upgraded Aeropack	3200	20	All maps
Vespertide Vespertide	3200	20	All maps
Vigilant Wardstone Vigilant Wardstone	2300	40	Summoner's Rift
Warmog's Armor Warmog's Armor	3000	10	All maps
Watchful Wardstone Watchful Wardstone	1100	25	Summoner's Rift
Zeke's Convergence Zeke's Convergence	2400	20	All maps
Zhonya's Hourglass Zhonya's Hourglass	2500	10	All maps

• Duskblade of Draktharr ( Draktharr's Shadowcarver)
• Goredrinker ( Ceaseless Hunger)
• Liandry's Anguish ( Liandry's Lament)
• Moonstone Renewer ( Starcaster)
• Night Harvester ( Vespertide)
• Sunfire Aegis ( Forgefire Crest)

Runes

• Transcendence
• Ability haste rune shard

Neutral Buffs

• Crest of Insight

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

• Annie's Disintegrate
• Darius' Crippling Strike
• Hecarim's Rampage
• Illaoi's Leap of Faith
• Irelia's Bladesurge
• Kindred's Dance of Arrows *
• Nasus' Fury of the Sands
• Neeko's Inherent Glamour
• Nidalee's Aspect of the Cougar
• Pantheon's Grand Starfall
• Poppy's Keeper's Verdict
• Quinn's Harrier
• Shadow Assassin's Shadow Step
• Sona's Crescendo
• Tahm Kench's Abyssal Voyage
• Varus' Blighted Quiver
• Vayne's Tumble
• Veigar's Dark Matter
• Vi's Vault Breaker
• Zed's Death Mark
• Zilean's Time in a Bottle

Flat Reduction

• Aatrox's Deathbringer Stance
• Amumu's Tantrum
• Ezreal's Mystic Shot
• Fizz's Seastone Trident
• Garen's Judgment
• Gragas' Body Slam
• Graves' Quickdraw
• Karma's Gathering Fire
• Katarina's Voracity
• Lucian's Relentless Pursuit
• Maokai's Sap Magic
• Master Yi's Alpha Strike
• Miss Fortune's Strut
• Nocturne's Umbra Blades
• Olaf's Undertow and Reckless Swing
• Senna's Piercing Darkness
• Shen's Ki Barrier
• Shyvana's Twin Bite
• Skarner's Crystal Slash and Fracture
• Syndra's Force of Will *
• Taric's Bravado
• Thresh's Death Sentence
• Tryndamere's Spinning Slash
• Varus' Piercing Arrow
• Vi's Blast Shield
• Xin Zhao's Three Talon Strike
• Zac's Unstable Matter
• Zed's Shadow Slash
• Ziggs' Short Fuse
• Zilean's Rewind

Percentage Reduction

• Fiddlesticks' Bountiful Harvest
• Fiora's Lunge
• Gnar's Boomerang Throw and Boulder Toss
• Janna's Eye of the Storm
• Kai'Sa's Void Seeker
• Kha'Zix's Evolved Reaper Claws
• Lee Sin's Safeguard
• Master Yi's Highlander
• Morgana's Tormented Shadow
• Nasus' Fury of the Sands
• Nautilus' Dredge Line
• Nidalee's Pounce
• Pantheon's Comet Spear
• Rakan's Fey Feathers
• Talon's Noxian Diplomacy
• Warwick's Blood Hunt
• Xerath's Rite of the Arcane
• Yasuo's Steel Tempest
• Zac's Elastic Slingshot

Cooldown Refresh

• Azir's Shifting Sands
• Corki's Special Delivery
• Diana's Lunar Rush
• Darius' Noxian Guillotine (rank 3)
• Draven's Blood Rush
• Evelynn's Whiplash
• Gangplank's Trial by Fire
• Irelia's Bladesurge
• Kalista's Rend
• Kha'Zix's Evolved Wings
• Kled's Skaarl the Cowardly Lizard
• Nidalee's Aspect of the Cougar *
• Qiyana's Royal Privilege and Edge of Ixtal
• Ryze's Overload
• Samira's Wild Rush
• Shadow Assassin's Umbral Trespass
• Swain's Demonic Ascension
• Tahm Kench's Devour
• Tristana's Rocket Jump
• Twitch's Ambush

Increasing ultimate haste

Ultimate haste stacks additively and is applied before ability haste.

• Ultimate Hunter
• Cloudbringer's Grace

Ultimate ability haste
	None	0	1	2	3	4	5
None	0	6	11	16	21	26	31
1	12	18	23	28	33	38	43
2	24	30	35	40	45	50	55
3	36	42	47	52	57	62	67
4	48	54	59	64	69	74	79

Increasing item haste

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

• Cosmic Insight
• Ingenious Hunter

Item Haste
	None	0	1	2	3	4	5
None	0	10	15	20	25	30	35
	10	20	25	30	35	40	45

Item Haste (Equivalent in CDR)
	None	0	1	2	3	4	5
None	0%	9.09%	13.04%	16.67%	20%	23.08%	25.93%
	9.09%	16.67%	20%	23.08%	25.93%	28.57%	31.03%

Increasing summoner spell haste

• Cosmic Insight
• Ionian Boots of Lucidity
• Howling Abyss aura

Summoner spell haste
Base cooldown ▶	420s ()	300s ()	240s ()	210s ()	180s ()	90s ()	80s ()	20s ()
▼  Haste
12 ()	375s	267.86s	214.29s	187.5s	160.71s	80.36s	N/A	17.86s
18 ()	355.93s	254.24s	203.39s	177.97s	152.54s	76.27s	N/A	16.95s
30 ( )	323.08s	230.77s	184.62s	161.54s	138.46s	69.23s	N/A	15.38s
70 ()	N/A	176.47s	141.18s	123.53s	105.88s	N/A	47.06s	11.76s
90.4 ()	N/A	157.56s	126.05s	110.29s	94.54s	N/A	42.02s	10.5s
100.6 ()	N/A	149.55s	119.64s	104.69s	89.73s	N/A	39.88s	9.97s
121 ()	N/A	135.75s	108.6s	95.02s	81.45s	N/A	36.2s	9.05s

Runes

• Arcane Comet is the only rune that can have its remaining cooldown be reduced. It is reduced by a percentage upon hitting an enemy champion with ability damage.

Trivia

• 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.

---

Last updated: November 15, 2020, patch V10.23

• The highest attainable ability haste is 223 AH.

• Ally:
  • Ornn
• Items:
  • Draktharr's Shadowcarver or Ceaseless Hunger or Liandry's Lament or Starcaster
  • Vigilant Wardstone
  • Cosmic Drive
  • Navori Quickblades
  • Black Cleaver
  • A 20 ability haste legendary item
• Runes:
  • Transcendence
  • Ability haste rune shard
• Buffs:
  • Crest of Insight

• Relevant mathematics:
  • Items = 25 + 25 + 40 + 30 + 30 + 25 + 20 = 195 ability haste
  • Runes = 10 + 8 = 18 ability haste
  • Buff = 10 = 10 ability haste
    • Total ability haste = 195 + 18 + 10 = 223

Champion statistics