[[File:Template:Tip data/Cooldown reduction|20px|link=Template:Tip data/Cooldown reduction]][[File:Template:Tip data/Cooldown reduction|20px|link=Template:Tip data/Cooldown reduction]][[File:Template:Tip data/Cooldown reduction|20px|link=Template:Tip data/Cooldown reduction]] [[:Template:Tip data/Cooldown reduction|Cooldown Reduction]] (abbreviated as CDR) is a champion statistic that either reduces the cooldown of champion abilities, or the amount of time before an ability can be used again after activation, by a percentage. This stat is tracked and can be seen in the champion stats tooltip. This cooldown reduction is different than the cooldown reduction for summoner spells and items, with the value not being visibly tracked in game. Items and runes may reduce the cooldown for summoner spells and other items.
Cooldown reduction can be granted by items, 
buffs, and runes. CDR 
stacks additively and is capped at 40%, which can be increased to 45% with the 
Cosmic Insight rune.
Cooldown reduction is determined at the moment an ability is activated. Increasing/decreasing cooldown reduction while the skill is on cooldown will not affect the cooldown.
Based on the type of cooldown reduction, it can affect:
- Champion ability cooldowns. (e.g.
Lucian's Piercing Light) - Item active effects. (e.g. Locket of the Iron Solari).
- Item passive effects with cooldowns. (e.g. Guardian Angel).
- Summoner spells. (e.g. Flash)
Cooldown reduction does not apply to:
- Static cooldowns. (e.g. Anivia's Rebirth)
- On-target Cooldowns. (e.g. Jarvan IV's Martial Cadence)
- Interrupted Durations. (e.g. Garen's Perseverance)
- Rune cooldowns.
Gold Value
- Cooldown reduction has a gold value of Template:Gold value math/varExpression error: Unexpected round operator. per point.
Increasing cooldown reduction
Items
Unnamed Cooldown Reduction
This table is automatically generated based on the data from Module:ItemData/data.
| Item | Cost | Amount | Availability |
|---|
Named Cooldown Reduction
- Template:Item data Luden's Echo
Runes
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 cooldown reduction takes effect while flat reduction occurs after cooldown reduction takes effect. By using those, a champion can circumvent the 40% cooldown reduction cap.
- Depending on built-in reduction type:
- Base (applies before CDR)
- Flat (applies after CDR)
- 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
- Fiddlesticks' Drain
- Fizz's Seastone Trident
- 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
- Evelynn's Hate Spike
- 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
- Shadow Assassin's Umbral Trespass
- Swain's Demonic Ascension
- Tahm Kench's Devour
- Tristana's Rocket Jump
- Twitch's Ambush
Other Cooldown Reduction
Ultimate ability
Template:Ultimate CDR table
- Notes
- Ultimate Hunter and Cloudbringer's Grace stack additively with each other while normal CDR stacks multiplicatively with them.
Item Effects
| Active Item CDR | |||||||
|---|---|---|---|---|---|---|---|
| None |  0
|
1
|
2
|
3
|
4
|
5
| |
| None | 0% | 15% | 20% | 25% | 30% | 35% | 40% |
|
5% | 20% | 25% | 30% | 35% | 40% | 45% |
- Notes
- Cosmic Insight and Ingenious Hunter stack additively with each other.
- Multiple copies of the same active ability item, and unique named active share a global cooldown.
- Purchasing yet another copy while the already owned ones are still on CD will make the newest one's sync up with the others'.
Summoner spells
 Summoner's Rift
| |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Base cooldown ▶ | 360s (  )
|
300s (  )
|
240s (    )
|
210s (    )
|
180s (   )
|
90s (  )
|
20s (  )
| ||
▼  Haste
| |||||||||
12 ( )
|
321.43s | 267.86s | 214.29s | 187.5s | 160.71s | 80.36s | 17.86s | ||
18 (/ )
|
305.08s | 254.24s | 203.39s | 177.97s | 152.54s | 76.27s | 16.95s | ||
| 30 (/ )
|
276.92s | 230.77s | 184.62s | 161.54s | 138.46s | 69.23s | 15.38s | ||
| 36 ( )
|
264.71s | 220.59s | 176.47s | 154.41s | 132.35s | 66.18s | 14.71s | ||
| 48 ( )
|
243.24s | 202.7s | 162.16s | 141.89s | 121.62s | 60.81s | 13.51s | ||
 Howling Abyss
| |||||||||
| Base cooldown ▶ | 300s ( )
|
240s ( )
|
210s ( )
|
180s ( )
|
80s (  )
|
20s ( )
| |||
| ▼ Haste
| |||||||||
70 ( )
|
176.47s | 141.18s | 123.53s | 105.88s | 47.06s | 11.76s | |||
| 82 ()
|
164.84s | 131.87s | 115.38s | 98.9s | 43.96s | 10.99s | |||
| 88 (/)
|
159.57s | 127.66s | 111.7s | 95.74s | 42.55s | 10.64s | |||
| 100 (/)
|
150s | 120s | 105s | 90s | 40s | 10s | |||
| 106 ()
|
145.63s | 116.5s | 101.94s | 87.38s | 38.83s | 9.71s | |||
| 118 ()
|
137.61s | 110.09s | 96.33s | 82.57s | 36.7s | 9.17s | |||
Runes
- Only 1 rune in the entire game has a way to reduce its cooldown. That rune being Arcane Comet, which gets it's cooldown reduced by a percentage whenever the user deals ability damage to an enemy champion and Arcane Comet is on cooldown.
Trivia
Last updated: December 15th, 2019 – V9.24
One cost and efficient way to reach maximum CDR (45%) is:
- Having both Cosmic Insight and
Transcendence, and reaching level 10, giving 15% CDR. - Then by buying the Ionian Boots of Lucidity which will provide 10% CDR.
- And finally by purchasing a 20% CDR–item.
- Frozen Heart – Template:Item data Frozen Heart
- Iceborn Gauntlet – Template:Item data Iceborn Gauntlet
- Hextech GLP-800 – Template:Item data Hextech GLP-800
- Nashor's Tooth – Template:Item data Nashor's Tooth
- The Black Cleaver – Template:Item data The Black Cleaver
- Essence Reaver – Template:Item data Essence Reaver
- Archangel's Staff – Template:Item data Archangel's Staff
- Luden's Echo – Template:Item data Luden's Echo
- Trinity Force – Template:Item data Trinity Force
The most cooldown reduction any champion can obtain at level 1 with 
500 is 15%. To achieve this a champion must:
- Have the Cosmic Insight rune which will provide 5% CDR.
- Have the Crest of Insight from the Blue Sentinel (10% CDR)
- Relevant mathematics:
- 5% + 10% = 15%
| Offensive |  Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Omnivamp · Physical vamp ·  True damage
|
|---|---|
| Defensive |  Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
|
| Utility | Ability haste ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration  Movement speed ·  Range
|
| Other |  Experience ·  Gold generation
|