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Cooldown reduction

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Cooldown reduction (abbreviated as CDR) is a champion statistic that reduces the cooldown of abilities, or the amount of time you must wait before an ability can be used again once you activated it, by a percentage.

Cooldown reduction is granted by items, buffs, runes and masteries, as well as some passive abilities.

Cooldown reduction stacks additively. For example, if you have 5% cooldown reduction from masteries and 10% cooldown reduction from Stinger, you will have 15% cooldown reduction. Cooldown reduction cannot be increased beyond 40%.

One cost and mastery efficient way to achieve max CDR is to max out the Sorcery mastery (5%) and purchase any 20% reduction item and the Ionian Boots of Lucidity (15%), giving a total of 40% CDR. The cheapest is the Ionian Boots and Morellonomicon (2200G).

Cooldown reduction is determined at the moment an ability is activated. Increasing/decreasing your cooldown reduction while the skill is on cooldown will not affect the cooldown.

Cooldown reduction does not apply on item active abilities such as that of Deathfire Grasp or item passive effects with cooldowns such as that of  Guardian Angel. Most sources of cooldown reduction also do not apply on summoner spells unless specifically stated, e.g. the unique enchantment effect of Distortion for boots. Cooldown Reduction does not apply to an Innate Ability of any kind.

Increasing cooldown reduction

Items

  • Ardent Censer: +10% cooldown reduction, +30 ability power, +10 mana regeneration. Unique Passive: Your heals and shields on another unit grant them +25% Attack Speed for 6 seconds. Unique Passive: 8% movement speed. 2200 gold.
  • Athene's Unholy Grail: Unique Passive: +20% cooldown reduction. +60 ability power, +40 magic resist, +15 mana regeneration. Unique Passive: Restores 12% of your max mana on kill or assist. Unique Passive - Mana Font: Increases your mana regeneration by 1% per 1% mana you are missing. 2600 gold.
  • Banner of Command: +20% cooldown reduction, +80 ability power. Unique Passive - Valor: Nearby allied minions deal 15% increased damage. Unique Active - Promote: Transforms a nearby siege minion to a more powerful unit. You gain all the gold this unit earns. 180 second cooldown. 2400 gold.
  • Deathfire Grasp: +10% cooldown reduction, +120 ability power. Unique Active: Deals 15% of target champion's maximum health in magic damage and amplifies all magic damage they take by 20% for 4 seconds. 60 second cooldown (750 range). 3100 gold.
  • Essence Reaver: 10% cooldown reduction, +60 attack damage, +10% life steal. Unique Passive: You gain 2-8% of the damage dealt by basic attacks as mana. This effect increases based on how much mana you are missing. 2650 gold.
  • Face of the Mountain: +10% cooldown reduction. +375 health, +25 health regeneration. Unique Passive - Spoils of War: Melee autoattacks execute minions below 200 (+100% AD) health. Killing a minion by any means heals yourself and the nearest allied champion for 50 (+1% of your maximum health) health and grants them gold equal to the kill. These effects require a nearby allied champion and consume a charge. Recharges every 30 seconds for a maximum of 4 charges. Unique Active - Deadly Phalanx: After 4 seconds, the shield explodes, dealing magic damage equal to (100% of the target's AD) + (30% of the target's AP), regardless of if the shield remained intact (60 second cooldown). You may only be in possession of 1 Gold Income item. 2000 gold.
  • Fiendish Codex: Unique Passive: +10% cooldown reduction. +30 ability power. 820 gold.
  • Frost Queen's Claim: +10% cooldown reduction, +50 ability power, +10 mana regeneration, +4 gold per 10 seconds. Unique Passive - Tribute: Your next basic attack or ability to damage a champion or tower will deal 10 bonus damage and generate 5 gold. You generate one charge of Tribute every 10 seconds, storing up to 3. Tribute is disabled for 12 seconds if you kill a minion. Unique Active - Arctic Embrace: You throw a shard of true ice that detonates at the target location, dealing 50 + (5 * level) magic damage to all enemies the missile passes through and those in the 300-radius explosion, as well as slowing them by 80% that decays over 3 seconds (60 second cooldown). You may only be in possession of 1 Gold Income item. 2200 gold.
  • Frozen Heart: +20% cooldown reduction, +100 armor, +350 mana. Unique Aura: Reduces the attack speed of nearby enemies by 15%. 2600 gold.
  • Glacial Shroud: Unique Passive: +10% cooldown reduction, +250 mana, +20 armor. 950 gold.
  • Iceborn Gauntlet: +10% cooldown reduction, +30 ability power, +500 mana, +60 armor. Unique Passive - Spellblade: After using an ability, your next basic attack deals bonus physical damage equal to 125% of your base attack damage to surrounding enemies and creates a field for 3 seconds that slows enemies inside by 35% (2 second cooldown). 2900 gold.
  • Ionian Boots of Lucidity: Unique Passive: +15% cooldown reduction. Unique Passive: +45 movement speed. 1000 gold.
  • Kindlegem: Unique Passive: +10% cooldown reduction. +200 health. 850 gold.
  • Locket of the Iron Solari: +10% cooldown reduction, +20 magic resistance, +300 health, +10 health regeneration. Unique Active: Shield yourself and nearby allies for 5 seconds, absorbing up to 50 (+10 per level) damage. 60 second cooldown. Unique Aura - Legion: Nearby allies gain 20 magic resist and 10 health regeneration. 2800 gold.
  • Mikael's Crucible: +10% cooldown reduction, +40 magic resist, +20 mana regeneration. Unique Passive - Mana Font: Increases your Mana Regen by 1% per 1% Mana you are missing. Unique Active: Removes all stuns, roots, taunts, fears, silences and slows on an allied champion and heals for 150 + 10% of the target's maximum health. (180 second cooldown). 2450 gold.
  • Morellonomicon: +20% cooldown reduction, +75 ability power, +12 mana regeneration. Unique Passive: Dealing magic damage to an enemy champion below 40% health inflicts Grievous Wounds to them for 4 seconds. 2200 gold.
  • Nashor's Tooth: Unique Passive: +20% cooldown reduction. +50% attack speed, +65 ability power. Unique Passive: Basic attacks deal 15 (+15% AP) bonus magic damage on hit 2920 gold.
  • Spirit Visage: +10% cooldown reduction, +55 magic resistance, +400 health, +20 health regen. Unique Passive: Increases healing and regeneration on yourself by 20%. 2750 gold.
  • Stinger: Unique Passive: +10% cooldown reduction. +40% attack speed. 1250 gold..
  • Talisman of Ascension: +20% cooldown reduction, +10 health regeneration, +15 mana regeneration, +2 gold generation. Unique Passive - Favor: Grants 3 gold and 5 health each time a nearby enemy minion dies that you didn't kill. Unique Active: Nearby champions gain 40% movement speed for 3 seconds (60 second cooldown). You may only be in possession of 1 Gold Income item. 2200 gold.
  • The Black Cleaver: +10% cooldown reduction, +200 health, +50 attack damage, Unique Passive: +10 armor penetration. Passive: Dealing physical damage to an enemy champion reduces their armor by 5% for 4 seconds. This effect stacks up to 5 times. 3000 gold.
  • The Brutalizer: Unique Passive: +10% cooldown reduction. +25 attack damage. Unique Passive: +10 armor penetration. 1337 gold.
  • Twin Shadows: +10% cooldown reduction, +80 ability power, +6% movement speed. Unique Active: Hunt - Summons 2 invulnerable ghosts for 6 seconds to seek the two nearest enemy champions. If they touch an enemy champion, they slow their movement speed by 40% and reveal them for 2.5 seconds. If the ghosts fail to find a target, they attempt to return to the caster. Each ghost that successfully returns to the caster reduces the cooldown of this item by 40 / 20. 120 / 60 second cooldown. 2400 gold.
  • Will of the Ancients: +10% cooldown reduction, +80 ability power. Unique Passive: +20% spell vamp. 2500 gold.
  • Youmuu's Ghostblade: +10% cooldown reduction, +30 attack damage, +15% critical strike chance. Unique Passive: +20 armor penetration. Unique Active: You gain +20% movement speed and +40% attack speed for 6 seconds (4 seconds for ranged champions). 45 second cooldown. 2700 gold.
  • Zeke's Herald: +20% cooldown reduction, +250 health. Unique Aura: Nearby allied champions gain +20 attack damage and +10% life steal. 2550 gold.
  • Zephyr: +10% cooldown reduction, +25 attack damage, +50% attack speed, +10% movement speed. Unique Passive - Tenacity: The duration of stuns, slows, taunts, fears, silences, blinds and immobilizes are reduced by 35%. 2850 gold.

Variable Availability

  • TC Blackfire Torch: +10% cooldown reduction , +80 ability power, +10% movement speed. Unique Active: Deals 20% of target champion's maximum Health in magic damage over 4 seconds and increases all subsequent magic damage taken by target by 20% (60 second cooldown). 2650 gold.
  • SH Elixir of Brilliance: On use, grants +10% cooldown reduction, +20-40 ability power based on champion level for 3 minutes. 250 gold.
  • TCH Hextech Sweeper: Passive: +20% cooldown reduction, +40 ability power, +250 health. Unique Passive - Trap Detection: Nearby stealthed enemy traps are revealed. Unique Active: Covers an area with stealth-detecting mist for 5 seconds, granting vision of units which pass through it for 3 seconds. 60 second cooldown. (800 Range, 375 AoE estimate). 2300 gold.
  • T Ichor of Illumination: On use, grants +15% cooldown reduction, +30-64 ability power based on champion level for 4 minutes. 500 gold..
  • S Mejai's Soulstealer: At 20 stacks, your champion gains 15% cooldown reduction. +20 ability power. Unique Passive: Your champion gains 8 ability power per stack, receiving 2 stacks for a kill or 1 stack for an assist. This effect can stack 20 times; you lose a third of your stacks if you die. 1235 gold.
  • STH Spirit of the Ancient Golem: +10% cooldown reduction, +350 health, +14 health regeneration, +7 mana regeneration. Unique Passive - Tenacity: The duration of stuns, slows, taunts, fears, silences, blinds and immobilizes are reduced by 35%. Unique Passive - Conservation: You generate Conservation stacks every 1.5 seconds, up to 80. Killing a large monster will consume up to 40 stacks and grant 1 bonus gold per stack consumed. Unique Passive - Butcher: Damage dealt to neutral monsters increased by 30%. Unique Passive - Gold Income: You may only be in possession of 1 Gold Income item. 2000 gold.
  • STH Spirit of the Elder Lizard: +10% cooldown reduction, +30 attack damage, +14 health regeneration, +7 mana regeneration. Unique Passive - Incinerate: Deals an addition 14 + (2 × level) bonus true damage over 3 seconds on dealing physical damage. Unique Passive - Conservation: You generate Conservation stacks every 1.5 seconds, up to 80. Killing a large monster will consume up to 40 stacks and grant 1 bonus gold per stack consumed. Unique Passive - Butcher: Damage dealt to neutral monsters increased by 30%. You may only be in possession of 1 Gold Income item. 2000 gold.
  • STH Spirit of the Spectral Wraith: +10% cooldown reduction, +50 ability power, +14 health regeneration, +7 mana regeneration. Unique Passive: You restore health and mana equal to 8% of your damage dealt to neutral monsters (halved for area of effect spells). Unique Passive - Conservation: You generate Conservation stacks every 1.5 seconds, up to 80. Killing a large monster will consume up to 40 stacks and grant 1 bonus gold per stack consumed. Unique Passive - Butcher: Damage dealt to neutral monsters increased by 30%. You may only be in possession of 1 Gold Income item. 2000 gold.

Champion abilities

Masteries

  • Sorcery increases cooldown reduction by 1.25 / 2.5 / 3.75 / 5%.
  • Intelligence increases cooldown reduction by 2 / 3.5 / 5%.

Runes

Neutral buffs

Lowering cooldowns

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 disregard the 40% cooldown reduction cap.

Note: Only the cooldown reduction of these abilities is shown here, to read more information on each of these abilities, follow the link on each of them.

Base reduction

Flat reduction

Percentage reduction

Cooldown refreshing

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