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Cooldown reduction icon Cooldown Reduction (abbreviated as CDR) is a champion statistic that either reduces the cooldown of champion abilities, or the amount of time before an ability can be used again after activation, by a percentage. This stat is tracked and can be seen in the champion stats tooltip. This cooldown reduction is different than the cooldown reduction for summoner spells and items, with the value not being visibly tracked in game. Items and runes may reduce the cooldown for summoner spells and other items.

Cooldown reduction can be granted by items, Crest of Insight buff buffs, and runes. CDR Additive stacking icon 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 or decreasing cooldown reduction while the skill is on cooldown will not affect the cooldown.

Based on the type of cooldown reduction, it can affect:

Cooldown reduction does not apply to the following:

Gold Value ​​​

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

Increasing cooldown reduction


Unnamed Cooldown Reduction

Item Cost Amount Availability
Abyssal Mask item Abyssal Mask3000 Gold10 %All maps
Adaptive Helm item Adaptive Helm2800 Gold10 %All maps
Archangel's Staff item Archangel's Staff3200 Gold10 %Summoner's Rift
Archangel's Staff (Quick Charge) item Archangel's Staff (Quick Charge)3200 Gold10 %Howling Abyss
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
Black Cleaver item Black Cleaver3000 Gold20 %All maps
Caulfield's Warhammer item Caulfield's Warhammer1100 Gold10 % (Unique)All maps
Death's Dance item Death's Dance3600 Gold10 %All maps
Duskblade of Draktharr item Duskblade of Draktharr2900 Gold10 %All maps
Essence Reaver item Essence Reaver3300 Gold20 % (Unique)All maps
Fiendish Codex item Fiendish Codex900 Gold10 % (Unique)All maps
Forbidden Idol item Forbidden Idol800 Gold10 % (Unique)All maps
Frozen Fist item Frozen Fist2700 Gold20 %All maps
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 Mask3000 Gold10 %All maps
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
Luden's Echo item Luden's Echo3200 Gold10 %All maps
Luden's Pulse item Luden's Pulse3200 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
Obsidian Cleaver item Obsidian Cleaver3000 Gold20 %All maps
Redemption item Redemption2100 Gold10 %All maps
Righteous Glory item Righteous Glory2650 Gold10 %All maps
Magus item Runic Echoes1500 Gold10 %Summoner's Rift
Salvation item Salvation2100 Gold10 %All maps
Seraph's Embrace item Seraph's Embrace0 Gold10 %Summoner's Rift
Seraph's Embrace item Seraph's Embrace (Quick Charge)0 Gold10 %Howling Abyss
Sheen item Sheen1050 Gold10 %All maps
Shurelya's Reverie item Shurelya's Reverie2050 Gold10 %All maps
Spirit Visage item Spirit Visage2800 Gold10 %All maps
Stinger item Stinger1100 Gold10 % (Unique)All maps
Trinity Force item Trinity Force3733 Gold20 %All maps
Trinity Fusion item Trinity Fusion3733 Gold20 %All maps
Twin Shadows item Twin Shadows2400 Gold10 %All maps
Umbral Glaive item Umbral Glaive2400 Gold10 %All maps
Warmog's Armor item Warmog's Armor2850 Gold10 % (Unique)All maps
Warrior item Warrior1625 Gold10 %Summoner's Rift
Youmuu's Ghostblade item Youmuu's Ghostblade2900 Gold10 %All maps
Youmuu's Wraithblade item Youmuu's Wraithblade2900 Gold10 %All maps
Zeke's Convergence item Zeke's Convergence2250 Gold10 %All maps
Zhonya's Hourglass item Zhonya's Hourglass2900 Gold10 %All maps
Zhonya's Paradox item Zhonya's Paradox2900 Gold10 %All maps

Named Cooldown Reduction


Neutral Buffs

Champion Abilities

Some champions have abilities that decrease their cooldowns by a flat amount, or by a percentage, affecting either their base cooldown or current cooldown, or some abilities can completely 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 Refresh

Other Cooldown Reduction

Ultimate ability

Cooldown reduction on ultimate *
Normal CDR ▶ 0% 20% 40% Cosmic Insight rune
▼ Ultimate CDR
None 0% 20% 40% 45%
Ultimate Hunter rune0 5% 24% 43% 47.75%
Cloud Dragon buff1 10% 28% 46% 50.5%
Cloud Dragon buff2 20% 36% 52% 56%
Ultimate Hunter rune5 25% 40% 55% 58.75%
Cloud Dragon buff3 30% 44% 58% 61.5%
Cloud Dragon buff4 40% 52% 64% 67%
Cloud Dragon buff4Ultimate Hunter rune2 53% 62.4% 71.8% 74.15%
Cloud Dragon buff4Ultimate Hunter rune5 65% 72% 79% 80.75%

Item Effects

Active Item CDR
None Ingenious Hunter rune0 Ingenious Hunter rune1 Ingenious Hunter rune2 Ingenious Hunter rune3 Ingenious Hunter rune4 Ingenious Hunter rune5
None 0% 15% 20% 25% 30% 35% 40%
Cosmic Insight rune 5% 20% 25% 30% 35% 40% 45%
  • Cosmic Insight rune Cosmic Insight and Ingenious Hunter rune Ingenious Hunter stack additively with each other.
  • Multiple copies of the same active ability item, and unique named active 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 ▶ 420s
Cooldown reduction icon Cooldown reduction
5% (Cosmic Insight rune) 399s 285s 228s 199.5s 171s 85.5s N/A 19s
10% (Ionian Boots of Lucidity item) 378s 270s 216s 189s 162s 81s N/A 18s
15% (Ionian Boots of Lucidity itemCosmic Insight rune) 357s 255s 204s 178.5s 153s 76.5s N/A 17s
40% (Howling Abyss aura) N/A 180s 144s 126s 108s N/A 48s 12s
43% (Howling Abyss auraCosmic Insight rune) N/A 171s 136.8s 119.7s 102.6s N/A 45.6s 11.4s
50% (Howling Abyss auraIonian Boots of Lucidity item) N/A 150s 120s 105s 90s N/A 40s 10s
53% (Howling Abyss auraIonian Boots of Lucidity itemCosmic Insight rune) N/A 141s 112.8s 98.7s 84.6s N/A 37.6s 9.4s


  • Only 1 rune in the entire game has a way to reduce its cooldown. That rune being Arcane Comet rune Arcane Comet, which gets it's cooldown reduced by a percentage whenever the user deals ability damage to an enemy champion and Arcane Comet is on cooldown.


Last updated: December 15th, 2019 – V9.24

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 15%. To achieve this a champion must:

Relevant mathematics:
5% + 10%  = 15%

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