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 Stinger, you will have 15% cooldown reduction.

  • Cooldown reduction cannot be increased beyond 40%

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 Locket of the Iron Solari Locket of the Iron Solari or item passive effects with cooldowns such as that of Guardian Angel 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 Distortion for boots. Cooldown Reduction does not apply to an Innate Ability of any kind.

Although not a basic item, Kindlegem Kindlegem is the item from which the cooldown reduction gold value is derived. From this item derives a value of approximately แม่แบบ:G per percentage of cooldown reduction. This yields แม่แบบ:G for items with 10% CDR, แม่แบบ:G for 15% CDR, and แม่แบบ:G for 20% CDR.

Increasing cooldown reduction Edit

Items Edit

แม่แบบ:Stat table header แม่แบบ:Do for every item แม่แบบ:Stat table footer

Champion abilities Edit

  • None (due to wide variety of cooldown reduction items in season six). Cooldown lowering is separately discussed below.

Masteries Edit

Runes Edit

Name Type Tier 1 (Lesser) Tier 2 (Normal) Tier 3 (Greater)
Cooldown reduction Mark


X X 0.2}}0.2 %

410 IP



X X 0.36}}0.36 %

410 IP



{{#vardefine:n|0.47}}0.47 %


{{#vardefine:n|0.67}}0.67 %

1 IP

{{#vardefine:n|0.83}}0.83 %

820 IP



{{#vardefine:n|1.4}}1.4 %


{{#vardefine:n|1.95}}1.95 %

1 IP

{{#vardefine:n|2.5}}2.5 %

2050 IP

Cooldown Reduction, Scaling

(Cooldown Reduction per level)

Mark X X X
Seal X X X


X X {{#vardefine:n|0.09}}0.09 % per level ({{#vardefine:n|1.67}}1.67 %)

410 IP



X X {{#vardefine:n|0.28}}0.28 % per level ({{#vardefine:n|5}}5 %)

1025 IP

Neutral buffs Edit

Lowering cooldowns Edit

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 Edit

Flat reduction Edit

Percentage reduction Edit

Cooldown refreshing Edit

Trivia Edit

[Last updated 09/05/2016 on patch 6.9]

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

The most cooldown reduction any champion can obtain at level 1 is 40%. To achieve this you must :

Relevant mathematics:
5แม่แบบ:Plus10แม่แบบ:Plus{{#vardefine:n|1.8}}1.8แม่แบบ:Plus{{#vardefine:n|3.24}}3.24แม่แบบ:Plus{{#vardefine:n|7.47}}7.47แม่แบบ:Plus{{#vardefine:n|7.5}}7.5แม่แบบ:Plus5 แม่แบบ:Equals40%
(This value is actually {{#vardefine:n|40.01%}}40.01%, but in-game value is displayed rounded)


cs:Cooldown reduction de:Abklingzeitverringerung es:Reducción de enfriamiento fr:Réduction des délais de récupération pl:Skrócenie czasu odnowienia ru:Сокращение перезарядки zh:冷却缩减

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