Cooldown reduction

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, 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.

Cooldown reduction does not apply to:

• Static cooldowns.
• Item active abilities (e.g. Locket of the Iron Solari).
• Item passive effects with cooldowns (e.g. Guardian Angel).
• Runes.
• Summoner spells.

Gold Value ​

• Cooldown reduction has a gold value of 26.67 per point.

Increasing cooldown reduction

Items

Item	Cost	Amount	Availability
Abyssal Mask Abyssal Mask	3000	10 %	All maps
Adaptive Helm Adaptive Helm	2800	10 %	All maps
Ancient Coin Ancient Coin	400	5 %	Summoner's Rift
Archangel's Staff Archangel's Staff	3200	10 %	Summoner's Rift, Twisted Treeline
Archangel's Staff (Quick Charge) Archangel's Staff (Quick Charge)	3200	10 %	Howling Abyss, Nexus Blitz
Ardent Censer Ardent Censer	2300	10 %	All maps
Athene's Unholy Grail Athene's Unholy Grail	2100	10 %	All maps
Banshee's Veil Banshee's Veil	3000	10 %	All maps
Black Cleaver Black Cleaver	3000	20 %	All maps
Caulfield's Warhammer Caulfield's Warhammer	1100	10 % (Unique)	All maps
Death's Dance Death's Dance	3500	10 %	All maps
Duskblade of Draktharr Duskblade of Draktharr	2900	10 %	All maps
Essence Reaver Essence Reaver	3300	20 % (Unique)	All maps
Eye of Ascension Eye of Ascension	1500	10 %	Summoner's Rift
Eye of Frost Eye of Frost	850	10 %	Summoner's Rift
Eye of the Aspect Eye of the Aspect	1800	10 %	Summoner's Rift
Eye of the Watchers Eye of the Watchers	1800	10 %	Summoner's Rift
Fiendish Codex Fiendish Codex	900	10 % (Unique)	All maps
Forbidden Idol Forbidden Idol	800	10 % (Unique)	All maps
Frostfang Frostfang	850	10 %	Summoner's Rift
Frozen Fist Frozen Fist	2700	20 %	All maps
Frozen Heart Frozen Heart	2700	20 %	All maps
Glacial Shroud Glacial Shroud	900	10 % (Unique)	All maps
Hextech GLP-800 Hextech GLP-800	2800	10 %	All maps
Hextech Protobelt-01 Hextech Protobelt-01	2500	10 %	All maps
Iceborn Gauntlet Iceborn Gauntlet	2700	20 %	All maps
Infernal Mask Infernal Mask	3000	10 %	All maps
Ionian Boots of Lucidity Ionian Boots of Lucidity	900	10 % (Unique)	All maps
Kindlegem Kindlegem	800	10 % (Unique)	All maps
Knight's Vow Knight's Vow	2200	10 %	All maps
Lich Bane Lich Bane	3200	10 %	All maps
Lord Van Damm's Pillager Lord Van Damm's Pillager	3000	10 %	Twisted Treeline
Luden's Echo Luden's Echo	3200	10 %	All maps
Luden's Pulse Luden's Pulse	3200	10 %	All maps
Maw of Malmortius Maw of Malmortius	3250	10 %	All maps
Mikael's Crucible Mikael's Crucible	2100	10 %	All maps
Nashor's Tooth Nashor's Tooth	3000	20 % (Unique)	All maps
Nomad's Eye Nomad's Eye	850	10 %	Summoner's Rift
Nomad's Medallion Nomad's Medallion	850	10 %	Summoner's Rift
Obsidian Cleaver Obsidian Cleaver	3000	20 %	All maps
Ohmwrecker Ohmwrecker	2650	10 %	Summoner's Rift, Nexus Blitz
Redemption Redemption	2100	10 %	All maps
Remnant of the Ascended Remnant of the Ascended	1500	10 %	Summoner's Rift
Remnant of the Aspect Remnant of the Aspect	1800	10 %	Summoner's Rift
Remnant of the Watchers Remnant of the Watchers	1800	10 %	Summoner's Rift
Righteous Glory Righteous Glory	2650	10 %	All maps
Runic Echoes Runic Echoes	1500	10 %	Summoner's Rift, Twisted Treeline, Nexus Blitz
Salvation Salvation	2100	10 %	All maps
Seraph's Embrace Seraph's Embrace	0	10 %	Summoner's Rift, Twisted Treeline
Seraph's Embrace (Quick Charge) Seraph's Embrace (Quick Charge)	0	10 %	Howling Abyss, Nexus Blitz
Sheen Sheen	1050	10 %	All maps
Shurelya's Reverie Shurelya's Reverie	2250	10 % (Unique)	Summoner's Rift, Howling Abyss, Nexus Blitz
Spear of Shojin Spear of Shojin	3400	20 %	All maps
Spirit Visage Spirit Visage	2800	10 %	All maps
Stinger Stinger	1100	10 % (Unique)	All maps
Timeworn Ancient Coin Timeworn Ancient Coin	400	5 %	Twisted Treeline
Timeworn Face of the Mountain Timeworn Face of the Mountain	2100	10 %	Twisted Treeline
Timeworn Frostfang Timeworn Frostfang	850	10 %	Twisted Treeline
Timeworn Frost Queen's Claim Timeworn Frost Queen's Claim	2200	10 %	Twisted Treeline
Timeworn Nomad's Medallion Timeworn Nomad's Medallion	850	10 %	Twisted Treeline
Timeworn Talisman of Ascension Timeworn Talisman of Ascension	2200	10 %	Twisted Treeline
Trinity Force Trinity Force	3733	20 %	All maps
Trinity Fusion Trinity Fusion	3733	20 %	All maps
Twin Shadows Twin Shadows	2400	10 %	All maps
Warmog's Armor Warmog's Armor	2850	10 % (Unique)	All maps
Warrior Warrior	1625	10 %	Summoner's Rift, Twisted Treeline, Nexus Blitz
Youmuu's Ghostblade Youmuu's Ghostblade	2900	10 %	All maps
Youmuu's Wraithblade Youmuu's Wraithblade	2900	10 %	All maps
Zeke's Convergence Zeke's Convergence	2250	10 %	All maps
Zhonya's Hourglass Zhonya's Hourglass	2900	10 %	Summoner's Rift, Howling Abyss, Nexus Blitz
Zhonya's Paradox Zhonya's Paradox	2900	10 %	Summoner's Rift, Howling Abyss, Nexus Blitz

• Archangel's Staff: Passive: Unique – Haste: Grants an additional 10% cooldown reduction.
• Hextech GLP-800: Passive: Unique – Haste: Grants an additional 10% cooldown reduction.
• Lost Chapter: Passive: Unique – Haste: Grants an additional 10% cooldown reduction.
• Luden's Echo: Passive: Unique – Haste: Grants an additional 10% cooldown reduction.
• Seraph's Embrace: Passive: Unique – Haste: Grants an additional 10% cooldown reduction.

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

• Annie's Disintegrate
• Darius' Crippling Strike
• Hecarim's Rampage
• Illaoi's Leap of Faith
• Kindred's Dance of Arrows

Flat reduction

• Aatrox's Deathbringer Stance
• Amumu's Tantrum
• Ezreal's Mystic Shot
• Gragas' Body Slam
• Graves' Quickdraw
• Karma's Gathering Fire
• Katarina's Voracity
• Lucian's Relentless Pursuit
• Master Yi's Alpha Strike
• Miss Fortune's Guns Blazing
• Nocturne's Umbra Blades
• Olaf's Undertow and Reckless Swing
• Shaco's Deceive
• Shyvana's Twin Bite
• Skarner's Crystal Slash
• Syndra's Force of Will
• Taric's Bravado
• Thresh's Death Sentence
• Tryndamere's Spinning Slash
• Xin Zhao's Three Talon Strike
• Zed's Living Shadow
• Ziggs' Short Fuse
• Zilean's Rewind

Percentage reduction

• Evelynn's Hate Spike
• Gnar's Boomerang Throw and Boulder Toss
• Kha'Zix's Evolved Reaper Claws
• Lux's Final Spark
• Master Yi's Highlander
• Nasus' Fury of the Sands
• Nidalee's Pounce
• Sona's Crescendo
• Veigar's Dark Matter
• Yasuo's Steel Tempest

Cooldown refreshing

• Diana's Lunar Rush
• Darius' Noxian Guillotine (rank 3)
• Draven's Blood Rush
• Evelynn's Whiplash
• Irelia's Bladesurge
• Kalista's Rend
• Kha'Zix's Evolved Wings
• Ryze's Overload
• Tristana's Rocket Jump
• Twitch's Ambush

Other cooldown reducing effects

Active ability items

• Cosmic Insight
• Ingenious Hunter
• Perfect Timing ( Guardian Angel, Gargoyle Stoneplate, Wooglet's Witchcap, Wooglet's Witchcrown, Zhonya's Hourglass and Zhonya's Paradox)

Active Item CDR		Perfect Timing
		()
None		15%
	5%	19.25%
0	15%	27.75%
0 / 1	20%	32%
1 / 2	25%	36.25%
2 / 3	30%	40.5%
3 / 4	35%	44.75%
4 / 5	40%	49%
5	45%	53.25%

Notes

• Cosmic Insight and Ingenious Hunter stack additively with each other while 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

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

Summoner spell CDR
Base cooldown ▶	360s ()	300s ()	240s ()	210s ()	180s ()	90s ()	80s ()
▼  Cooldown reduction
5% ()	342s	285s	228s	199.5s	171s	85.5s	N/A
10% ()	324s	270s	216s	189s	162s	81s	N/A
15% ()	306s	255s	204s	178.5s	153s	76.5s	N/A
40% ()	N/A	180s	144s	126s	108s	N/A	48s
43% ()	N/A	171s	136.8s	119.7s	102.6s	N/A	45.6s
50% ()	N/A	150s	120s	105s	90s	N/A	40s
52.5% ()	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:

• Having both Cosmic Insight and Transcendence, and reaching level 10, giving you 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 – 2700
  • Iceborn Gauntlet – 2700
  • Hextech GLP-800 – 2800
  • Nashor's Tooth – 3000
  • The Black Cleaver – 3000
  • Essence Reaver – 3300
  • Archangel's Staff – 3200
  • Luden's Echo – 3200
  • Trinity Force – 3733

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

• Have the Cosmic Insight rune which will provide 5% CDR.
• Buy Ancient Coin (5% CDR)
• Have the Crest of Insight from the Blue Sentinel (10% CDR)

Relevant mathematics:

5% + 5% + 10%  = 20%

 v · e

Champion statistics

Offensive	Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Spell vamp ·  True damage
Defensive	Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
Utility	Cooldown reduction ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration
Other	Experience ·  Gold generation ·  Movement speed ·  Range