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, 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 (15%), giving a total of 40% CDR. The cheapest is the Ionian Boots and (2300G).
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 summoner spells unless specifically stated, e.g. the unique enchantment effect of for boots. Cooldown Reduction does not apply to an Innate Ability of any kind.or item passive effects with cooldowns such as that of . Most sources of cooldown reduction also do not apply on
has been quoted by a Rioter to be the item of which cooldown reduction's gold value has been derived from. Cooldown reduction has the theoretical gold value of 31.67 gold per unit. This yields about 317 gold for items with 10% CDR, 475 gold for 15% CDR, and 633 gold for 20% CDR.
Increasing cooldown reduction
- +10% cooldown reduction, +40 ability power, +100% base mana regeneration. Unique Passive: +8% movement speed. Unique Passive: Your heals and shields on another unit grant them +25% Attack Speed for 6 seconds. 2100 gold. :
- +20% cooldown reduction, +60 ability power, +25 magic resist, +50% base mana regeneration. Unique Passive: Restores 15% of your maximum mana on kill or assist. Unique Passive – Mana Font: Restores 2% of missing mana every 5 seconds. 2700 gold. :
- +10% cooldown reduction, +200 health, +60 ability power, +20 magic resist. Unique Aura – Legion: Grants nearby allies +20 magic resist and +75% base health regeneration. Unique Active – Promote:Greatly increases the power of a lane minion and grants it immunity to magic damage (120 second cooldown). 3000 gold. :
- 10% cooldown reduction, +80 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. 3200 gold. :
- +10% cooldown reduction, +500 health, +100% base 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: Shield target ally for 10% of your maximum health for 4 seconds. After 4 seconds, the shield explodes, dealing 100% of their AD + 30% of their AP magic damage, regardless of if the shield remained intact (60 second cooldown). You may only be in possession of 1 Gold Income item. 2200 gold. :
- Unique Passive: +10% cooldown reduction. +30 ability power. 820 gold. :
- +10% cooldown reduction, +60% base mana regeneration. 600 gold. :
- +10% cooldown reduction, +50 ability power, +50% base mana regeneration, +2 gold per 10 seconds. Unique Passive – Tribute: Your next basic attack or ability to damage a champion or tower will deal 15 bonus damage and generate 10 gold. This can occur up to 3 times every 30 seconds. Unique Active: 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 2 seconds (60 second cooldown). You may only be in possession of 1 Gold Income item. 2200 gold. :
- +20% cooldown reduction, +100 armor, +400 mana. Unique Aura: Reduces the attack speed of nearby enemies by 15%. 2450 gold. :
- Unique Passive: +10% cooldown reduction, +250 mana, +20 armor. 950 gold. :
- +10% cooldown reduction, +30 ability power, +500 mana, +60 armor. Unique Passive - Spellblade: After using an ability, your next basic attack deals 125% base AD bonus physical damage to surrounding enemies and creates a field for 3 seconds that slows enemies inside by 30%. Half-sized field for ranged champions (1.5 second cooldown). 2900 gold. :
- Unique Passive: +15% cooldown reduction. Unique Passive – Enhanced Movement: +45 movement speed. 1000 gold. :
- Unique Passive: +10% cooldown reduction. +200 health. 850 gold. :
- +10% cooldown reduction, +400 health, +20 magic resistance. 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 +75% base health regeneration. 2800 gold. :
- +10% cooldown reduction, +40 magic resist, +100% base mana regeneration. Unique Passive – Mana Font: Restores 1.5% of missing mana every 5 seconds. Unique Active: Removes all stuns, roots, taunts, fears, silences and slows on an allied champion and heals for 150 + (10% of maximum health) (180 second cooldown). 2450 gold. :
- +20% cooldown reduction, +80 ability power, +100% base mana regeneration. Unique Passive: Dealing magic damage to an enemy champion below 40% health inflicts Grievous Wounds to them for 4 seconds. 2300 gold. :
- Unique Passive: +20% cooldown reduction. +50% attack speed, +60 ability power. Unique Passive: Basic attacks deal 15 + (15% AP) bonus magic damage on hit. 2920 gold. :
- +10% cooldown reduction, +55 magic resistance, +400 health, +100% base health regen. Unique Passive: Increases self-healing, health regen, life steal, and spell vamp effects by 20%. 2750 gold. :
- Unique Passive: +10% cooldown reduction. +40% attack speed. 1250 gold.. :
- +10% cooldown reduction, +100% base health regeneration, +100% base mana regeneration, +20 movement speed, +2 gold per 10 seconds. Unique Passive – Favor: Grants 3 gold and 10 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. :
- +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. :
- Unique Passive: +10% cooldown reduction. +25 attack damage. Unique Passive: +10 armor penetration. 1337 gold. :
- +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 / . ( / second cooldown). 2400 gold. :
- +10% cooldown reduction, +80 ability power. Unique Passive: +20% spell vamp. 2500 gold. :
- +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 (45 second cooldown). 2700 gold. :
- +20% cooldown reduction, +250 health. Unique Aura: Nearby allied champions gain +20 attack damage and +10% life steal. 2450 gold. :
- +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. :
- +20% cooldown reduction, +225 health, +250 mana, +25 armor. 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). 2130 gold. :
- At 20 stacks, your champion gains 15% cooldown reduction. +20 ability power. Unique Passive: Grants +8 ability power per stack and 5 stacks upon first purchase. Grants 2 stacks for a kill or 1 stack for an assist (max 20 stacks). Half the stacks are lost upon death. 1400 gold. :
- Cassiopeia's Aspect of the Serpent increases cooldown reduction by 25% at 250 stacks.
- Ryze's Overload increases cooldown reduction by 2 / 4 / 6 / 8 / 10%.
- Zyra's Rampant Growth increases cooldown reduction by 2 / 4 / 6 / 8 / 10%.
- Sorcery increases cooldown reduction by 1.25 / 2.5 / 3.75 / 5%.
- Intelligence increases cooldown reduction by 2 / 3.5 / 5%.
- The Crest of Insight buff increases cooldown reduction by 10%.
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.
- Cassiopeia's Twin Fang base cooldown is reduced to 0.5 seconds if the target is poisoned.
- Darius's Crippling Strike base cooldown is reduced by 1 second for every stack of Hemorrhage on the target.
- Hecarim's Rampage base cooldown is reduced by 1 second if it hits a target. (Stacks up to 2 times.)
- Nidalee's Pounce base cooldown is reduced to 1 second while it's currently higher if it kills a unit, or if Swipe hits an enemy marked as Hunted.
- Alistar's Triumphant Roar cooldown is reduced by 2 seconds each time a nearby enemy unit dies.
- Amumu's Tantrum cooldown is reduced by 0.5 seconds each time Amumu is hit by an attack.
- Ezreal's Mystic Shot reduces all of Ezreal's cooldowns by 1 second if it strikes an enemy unit.
- Gragas's Body Slam cooldown is reduced by 3 seconds if it hits an enemy unit.
- Graves's Quickdraw cooldown is reduced by 1 second for every autoattack.
- Karma's Mantra cooldown is reduced by 2 seconds for every skill that hits an enemy champion, and also half of it (1 second) for autoattacks against enemy champions.
- Katarina's Voracity reduces all her abilities' cooldowns by 15 seconds whenever she gets a kill or an assist.
- Lucian's Relentless Pursuit cooldown is reduced by 1 second for each of Lightslinger's strikes. (doubled against champions)
- Master Yi's Alpha Strike cooldown is reduced by 1 second for every autoattack.
- Nocturne's Umbra Blades innate cooldown is reduced by 1 second for every autoattack
- Olaf's Reckless Swing cooldown is reduced by 1 second for every autoattack.
- Undertow cooldown is reduced by 4.5 seconds if he manages to pick up his axe after using the ability.
- Ryze's Arcane Mastery allows him to reduce all of his other abilities' cooldowns by 1 when he uses an ability.
- Shen's Ki Strike cooldown is reduced by 1 second every time Shen autoattacks, or by 2 seconds every time Shen autoattacks while Feint's shield is up.
- Shyvana's Twin Bite cooldown is reduced by 0.5 seconds for every autoattack.
- Skarner's Crystal Slash cooldown is reduced by 0.5 seconds for each successful autoattack. (doubled against champions)
- Syndra's Force of Will cooldown is reduced by 1 second if she throws the Blue Sentinel.
- Taric's Gemcraft reduces Taric's cooldowns by 2 seconds on his next autoattack after using an ability.
- Thresh's Death Sentence cooldown is reduced by 3 seconds upon hitting an enemy.
- Tryndamere's Spinning Slash cooldown is reduced by 1 second for every critical strike.
- Xin Zhao's Three Talon Strike reduces his other abilities' cooldowns by 1 second for each strike.
- Zed's Living Shadow cooldown is reduced by 2 seconds when his Shadow Slash hits an enemy champion.
- Ziggs's Short Fuse innate cooldown is reduced by 4 seconds whenever he uses an ability.
- Zilean's Rewind on activation, reduces all of Zilean's other cooldowns by 10 seconds.
- Gnar's Boomerang Throw cooldown is reduced by 50 / 55 / 60% if he can catch it when its return.
- Boulder Toss cooldown is reduced by 50 / 55 / 60% if he picks up his boulder after using the ability.
- Master Yi's Highlander's passive component allows him to reduce the current cooldown on all of his basic abilities by 70% for every kill or assist he scores.
- Yasuo's Steel Tempest's cooldown is reduced by 1% for every 1.72% bonus attack speed he has.
- Cho'Gath's Feast's cooldown is reduced by 50% if it kills a minion or monster.
- Diana's Lunar Rush cooldown is refreshed if the target is afflicted with the Moonlight debuff from Crescent Strike.
- Draven's Blood Rush cooldown is refreshed if Draven catches Spinning Axe.
- Evelynn's Dark Frenzy cooldown is refreshed if Evelynn gets a champion kill or assist.
- Fiora's Burst of Speed cooldown is refreshed whenever Fiora gets a champion kill, and is reduced by half when she gets an assist.
- Irelia's Bladesurge cooldown is refreshed if it kills a unit.
- Kha'Zix's Evolved Wings cooldown is refreshed if Kha'Zix gets a champion kill or assist.
- Tristana's Rocket Jump cooldown is refreshed whenever Tristana gets a champion kill or assist.