Cooldown Reduction (abbreviated as CDR) is a champion statistic that reduces the cooldown of abilities, or the amount of time before an ability can be used again after activation, by a percentage. There are some items that separately reduce the cooldown for summoner spells or item active abilities, but do not grant cooldown reduction.

Cooldown reduction can be granted by items, Crest of Insight.png buffs, runes, and masteries. CDR stacks additively and is capped at 40%, which can be increased to 45% with the Intelligence mastery 2016.png Intelligence mastery.

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.

Cooldown reduction does not apply to:

Although not a basic item, Fiendish Codex item.png Fiendish Codex is the item from which the cooldown reduction gold value of Gold 24.75 per % cooldown reduction is derived.

Sources

Items

Item Cost Amount Availability
Abyssal Mask item.png Abyssal Mask2900 Gold 10 %Common
Adaptive Helm item.png Adaptive Helm2800 Gold 10 %Common
Ancient Coin item.png Ancient Coin350 Gold 5 %Classic
Ardent Censer item.png Ardent Censer2300 Gold 10 %Common
Athene's Unholy Grail item.png Athene's Unholy Grail2100 Gold 10 %Common
Banner of Command item.png Banner of Command2200 Gold 10 %Common
Banshee's Veil item.png Banshee's Veil3000 Gold 10 %Common
Caulfield's Warhammer item.png Caulfield's Warhammer1100 Gold 10 % (Unique)Common
Death's Dance item.png Death's Dance3500 Gold 10 %Common
Duskblade of Draktharr item.png Duskblade of Draktharr2900 Gold 10 %Common
Essence Reaver item.png Essence Reaver3400 Gold 10 % (Unique)Common
Eye of the Equinox item.png Eye of the Equinox2300 Gold 10 %Summoner's Rift
Eye of the Oasis item.png Eye of the Oasis1900 Gold 10 %Summoner's Rift
Eye of the Watchers item.png Eye of the Watchers2200 Gold 10 %Summoner's Rift
Face of the Mountain item.png Face of the Mountain2200 Gold 10 %Classic
Fiendish Codex item.png Fiendish Codex900 Gold 10 % (Unique)Common
Forbidden Idol item.png Forbidden Idol800 Gold 10 % (Unique)Common
Frost Queen's Claim item.png Frost Queen's Claim2200 Gold 10 %Classic
Frostfang item.png Frostfang850 Gold 10 %Classic
Frozen Heart item.png Frozen Heart2700 Gold 20 %Common
Glacial Shroud item.png Glacial Shroud900 Gold 10 % (Unique)Common
Hextech Protobelt-01 item.png Hextech Protobelt-012500 Gold 10 %Common
Iceborn Gauntlet item.png Iceborn Gauntlet2700 Gold 20 %Common
Infernal Mask item.png Infernal Mask3900 Gold 10 %Common
Ionian Boots of Lucidity item.png Ionian Boots of Lucidity900 Gold 10 % (Unique)Common
Kindlegem item.png Kindlegem800 Gold 10 % (Unique)Common
Knight's Vow item.png Knight's Vow2200 Gold 10 %Common
Lich Bane item.png Lich Bane3200 Gold 10 %Common
Lord Van Damm's Pillager item.png Lord Van Damm's Pillager3000 Gold 10 %Twisted Treeline
Maw of Malmortius item.png Maw of Malmortius3250 Gold 10 %Common
Mikael's Crucible item.png Mikael's Crucible2100 Gold 10 %Summoner's Rift, Howling Abyss
Morellonomicon item.png Morellonomicon2900 Gold 20 % (Unique)Common
Nashor's Tooth item.png Nashor's Tooth3000 Gold 20 % (Unique)Common
Nomad's Medallion item.png Nomad's Medallion850 Gold 10 %Classic
Ohmwrecker item.png Ohmwrecker2650 Gold 10 %Summoner's Rift
Redemption item.png Redemption2100 Gold 10 %Summoner's Rift, Howling Abyss
Righteous Glory item.png Righteous Glory2650 Gold 10 %Common
Salvation item.png Salvation2600 Gold 10 %Summoner's Rift, Howling Abyss
Sheen item.png Sheen1050 Gold 10 %Common
Spirit Visage item.png Spirit Visage2800 Gold 10 %Common
Stinger item.png Stinger1100 Gold 10 % (Unique)Common
Talisman of Ascension item.png Talisman of Ascension2200 Gold 10 %Classic
The Black Cleaver item.png The Black Cleaver3000 Gold 20 %Common
The Obsidian Cleaver item.png The Obsidian Cleaver4000 Gold 20 %Common
Trinity Force item.png Trinity Force3733 Gold 20 %Common
Trinity Fusion item.png Trinity Fusion4733 Gold 20 %Common
Warmog's Armor item.png Warmog's Armor2850 Gold 10 % (Unique)Common
Warrior item.png Warrior1625 Gold 10 %Classic
Youmuu's Ghostblade item.png Youmuu's Ghostblade2900 Gold 10 %Common
Zeke's Convergence item.png Zeke's Convergence2250 Gold 10 %Common
Zhonya's Hourglass item.png Zhonya's Hourglass2900 Gold 10 %Summoner's Rift, Howling Abyss

Runes

Type Tier 3 % of Highest Price
Regular
CDR mark 3 Mark 0.2% 24% IP 410
CDR seal 3 Seal 0.36% 43% IP 410
CDR glyph 3 Glyph 0.83% 100% IP 820
CDR quint 3 Quintessence 2.5% 100% IP 2050
Scaling
Scaling CDR glyph 3 Glyph 0.093 - 1.674 (based on level)% 100% IP 410
Scaling CDR quint 3 Quintessence 0.28 - 5.04 (based on level)% 100% IP 1025

Champion Abilities

Some champions have abilities that decrease their cooldowns by a flat amount, either their base cooldown or current cooldown, or entirely 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

Flat reduction

Percentage reduction

  • Evelynn Evelynn's Hate Spike.png Hate Spike cooldown is reduced by 60% if the first cast hits a monster.
  • Gnar Gnar's Boomerang Throw.png Boomerang Throw cooldown is reduced by 45 / 50 / 55 / 60% if he can catch it when its return (scales with GNAR!.png GNAR!'s level).
    • Boulder Toss.png Boulder Toss cooldown is reduced by 60% if he picks up his boulder after using the ability.
  • Master Yi Master Yi's Highlander.png Highlander passive component allows him to reduce the current cooldown on all of his basic abilities by 70% for every kill or assist he scores.
  • Nidalee Nidalee's Pounce.png Pounce base cooldown is reduced by 70% while it's currently higher if it kills a unit, or if Pounce.png Pounce hits an enemy marked as Prowl.png Hunted.
  • Sona Sona's Crescendo.png Crescendo decreases cooldowns of her basic abilities by 10 / 25 / 40%.
  • Veigar Veigar's Dark Matter.png Dark Matter's base cooldown is reduced by 0% - 99.99% (based on Phenomenal Evil Power Phenomenal Evil stacks).
  • Yasuo Yasuo's Steel Tempest.png Steel Tempest's cooldown is reduced by 1% for every 1.6725% bonus attack speed he has.

Cooldown refreshing

Other cooldown reducing effects

Active Ability Items

  • Ruby Sightstone item.png Ruby Sightstone's passive reduces active item cooldowns by 20%.
  • Multiple copies of the same active ability item 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

Trivia

Last updated: 23/06/2017 on patch V7.12

One cost and efficient way to reach maximum CDR (45%) is:


The most cooldown reduction any champion can obtain at level 1 is 40%. To achieve this you must :

Relevant mathematics:
5% + 20.01% + 5% + 10%  = 40.01%

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