Cooldown Reduction (abbreviated as CDR) is a champion statistic that reduces the cooldown of champion 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 buff buffs, and runes. CDR stacks additively and is capped at 40%, which can be increased to 45% with the Cosmic Insight rune 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.

Cooldown reduction does not apply to:

Gold Value ​​ Although not a basic item, Kindlegem item Kindlegem is the item from which the cooldown reduction gold value of Gold 26.6 per % cooldown reduction is derived.

Increasing cooldown reduction

Items

Item Cost Amount Availability
Abyssal Mask item Abyssal Mask3000 Gold10 %All maps
Adaptive Helm item Adaptive Helm2800 Gold10 %All maps
Ancient Coin item Ancient Coin400 Gold5 %Summoner's Rift
Archangel's Staff item Archangel's Staff3200 Gold10 %Summoner's Rift, Twisted Treeline
Archangel's Staff (Quick Charge) item Archangel's Staff (Quick Charge)3200 Gold10 %Howling Abyss, Nexus Blitz
Ardent Censer item Ardent Censer2300 Gold10 %All maps
Athene's Unholy Grail item Athene's Unholy Grail2100 Gold10 %All maps
Banshee's Veil item Banshee's Veil3000 Gold10 %All maps
Caulfield's Warhammer item Caulfield's Warhammer1100 Gold10 % (Unique)All maps
Death's Dance item Death's Dance3500 Gold10 %All maps
Deathfire Grasp item Deathfire Grasp3000 Gold10 %Nexus Blitz
Duskblade of Draktharr item Duskblade of Draktharr2900 Gold10 %All maps
Essence Reaver item Essence Reaver3000 Gold20 %All maps
Eye of Ascension item Eye of Ascension1500 Gold10 %Summoner's Rift
Eye of Frost item Eye of Frost850 Gold10 %Summoner's Rift
Eye of the Aspect item Eye of the Aspect1800 Gold10 %Summoner's Rift
Eye of the Watchers item Eye of the Watchers1800 Gold10 %Summoner's Rift
Fiendish Codex item Fiendish Codex900 Gold10 % (Unique)All maps
Forbidden Idol item Forbidden Idol800 Gold5 % (Unique)All maps
Frostfang item Frostfang850 Gold10 %Summoner's Rift
Frozen Heart item Frozen Heart2700 Gold20 %All maps
Glacial Shroud item Glacial Shroud900 Gold10 % (Unique)All maps
Hextech GLP-800 item Hextech GLP-8002800 Gold10 %All maps
Hextech Protobelt-01 item Hextech Protobelt-012500 Gold10 %All maps
Iceborn Gauntlet item Iceborn Gauntlet2700 Gold20 %All maps
Infernal Mask item Infernal Mask4000 Gold10 %All maps
Innervating Locket item Innervating Locket2800 Gold10 %Nexus Blitz
Ionian Boots of Lucidity item Ionian Boots of Lucidity900 Gold10 % (Unique)All maps
Kindlegem item Kindlegem800 Gold10 % (Unique)All maps
Knight's Vow item Knight's Vow2200 Gold10 %All maps
Lich Bane item Lich Bane3200 Gold10 %All maps
Lord Van Damm's Pillager item Lord Van Damm's Pillager3000 Gold10 %Twisted Treeline
Luden's Echo item Luden's Echo3200 Gold10 %All maps
Maw of Malmortius item Maw of Malmortius3250 Gold10 %All maps
Mikael's Crucible item Mikael's Crucible2100 Gold10 %All maps
Nashor's Tooth item Nashor's Tooth3000 Gold20 % (Unique)All maps
Nomad's Eye item Nomad's Eye850 Gold10 %Summoner's Rift
Nomad's Medallion item Nomad's Medallion850 Gold10 %Summoner's Rift
Ohmwrecker item Ohmwrecker2650 Gold10 %Summoner's Rift, Nexus Blitz
Philosopher's Medallion item Philosopher's Medallion450 Gold10 %Nexus Blitz
Redemption item Redemption2100 Gold10 %All maps
Remnant of the Ascended item Remnant of the Ascended1500 Gold10 %Summoner's Rift
Remnant of the Aspect item Remnant of the Aspect1800 Gold10 %Summoner's Rift
Remnant of the Watchers item Remnant of the Watchers1800 Gold10 %Summoner's Rift
Righteous Glory item Righteous Glory2650 Gold10 %All maps
Magus item Runic Echoes2625 Gold10 %Summoner's Rift, Twisted Treeline, Nexus Blitz
Salvation item Salvation2600 Gold10 %All maps
Seraph's Embrace item Seraph's Embrace0 Gold10 %Summoner's Rift, Twisted Treeline
Seraph's Embrace item Seraph's Embrace (Quick Charge)0 Gold10 %Howling Abyss, Nexus Blitz
Sheen item Sheen1050 Gold10 %All maps
Shurelya's Reverie item Shurelya's Reverie2250 Gold10 % (Unique)Summoner's Rift, Howling Abyss, Nexus Blitz
Spear of Shojin item Spear of Shojin2900 Gold10 %Nexus Blitz
Spirit Visage item Spirit Visage2800 Gold10 %All maps
Stat-Stick of Stoicism item Stat-Stick of Stoicism7337 Gold20 %Nexus Blitz
Stinger item Stinger1100 Gold10 % (Unique)All maps
The Black Cleaver item The Black Cleaver3000 Gold20 %All maps
The Obsidian Cleaver item The Obsidian Cleaver4000 Gold20 %All maps
Ancient Coin item Timeworn Ancient Coin400 Gold5 %Twisted Treeline
Face of the Mountain item Timeworn Face of the Mountain2100 Gold10 %Twisted Treeline
Frostfang item Timeworn Frostfang850 Gold10 %Twisted Treeline
Frost Queen's Claim item Timeworn Frost Queen's Claim2200 Gold10 %Twisted Treeline
Nomad's Medallion item Timeworn Nomad's Medallion850 Gold10 %Twisted Treeline
Talisman of Ascension item Timeworn Talisman of Ascension2200 Gold10 %Twisted Treeline
Trinity Force item Trinity Force3733 Gold20 %All maps
Trinity Fusion item Trinity Fusion4733 Gold20 %All maps
Twin Shadows item Twin Shadows2400 Gold10 %All maps
Warmog's Armor item Warmog's Armor2850 Gold10 % (Unique)All maps
Warrior item Warrior2625 Gold10 %Summoner's Rift, Twisted Treeline, Nexus Blitz
Youmuu's Ghostblade item Youmuu's Ghostblade2900 Gold10 %All maps
Zeke's Convergence item Zeke's Convergence2250 Gold10 %All maps
Zhonya's Hourglass item Zhonya's Hourglass2900 Gold10 %Summoner's Rift, Howling Abyss, Nexus Blitz
Zhonya's Paradox item Zhonya's Paradox3900 Gold10 %Summoner's Rift, Howling Abyss, Nexus Blitz

Runes

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

Cooldown refreshing

Other cooldown reducing effects

Active ability items

Active Item CDR Perfect Timing rune Perfect Timing
(Gargoyle Stoneplate itemZhonya's Hourglass itemZhonya's Paradox itemWooglet's Witchcap itemWooglet's Witchcrown item)
None 15%
Cosmic Insight rune 5% 19.25%
Ingenious Hunter rune0 15% 27.75%
Ingenious Hunter rune0Cosmic Insight rune / Ingenious Hunter rune1 20% 32%
Ingenious Hunter rune1Cosmic Insight rune / Ingenious Hunter rune2 25% 36.25%
Ingenious Hunter rune2Cosmic Insight rune / Ingenious Hunter rune3 30% 40.5%
Ingenious Hunter rune3Cosmic Insight rune / Ingenious Hunter rune4 35% 44.75%
Ingenious Hunter rune4Cosmic Insight rune / Ingenious Hunter rune5 40% 49%
Ingenious Hunter rune5Cosmic Insight rune 45% 53.25%
Notes
  • Cosmic Insight rune Cosmic Insight and Ingenious Hunter rune Ingenious Hunter stack additively with each other while Perfect Timing rune Perfect Timing stacks multiplicatively with them.
  • 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

Summoner spell CDR
Base cooldown ▶ 360s
(Teleport)
300s
(Flash)
240s
(ClarityHeal)
210s
(CleanseExhaustIgnite)
180s
(BarrierGhost)
90s
(Smite)
80s
(Mark)
Cooldown reduction icon Cooldown reduction
5% (Cosmic Insight rune) 342s 285s 228s 199.5s 171s 85.5s N/A
10% (Ionian Boots of Lucidity item) 324s 270s 216s 189s 162s 81s N/A
15% (Ionian Boots of Lucidity itemCosmic Insight rune) 306s 255s 204s 178.5s 153s 76.5s N/A
40% (Howling Abyss aura) N/A 180s 144s 126s 108s N/A 48s
43% (Howling Abyss auraCosmic Insight rune) N/A 171s 136.8s 119.7s 102.6s N/A 45.6s
50% (Howling Abyss auraIonian Boots of Lucidity item) N/A 150s 120s 105s 90s N/A 40s
52.5% (Howling Abyss auraIonian Boots of Lucidity itemCosmic Insight rune) N/A 142.5s 114s 99.75s 85.5s N/A 38s

Trivia

Last updated: June 1, 2018 – V8.11

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


The most cooldown reduction any champion can obtain at level 1 with Gold 500 is 20%. To achieve this you must :

Relevant mathematics:
5% + 5% + 10%  = 20%

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