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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 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 2014 Sorcery mastery (5%) and purchase any 20% reduction item and the Ionian Boots of Lucidity Ionian Boots of Lucidity (15%), giving a total of 40% CDR. The cheapest is the Ionian Boots and Morellonomicon Morellonomicon (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 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.

Kindlegem Kindlegem 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

Outta Time! Emote
"Time doesn't heal all wounds."
This article is outdated. Please update this article to reflect recent events or newly available information.
This article was last edited by Anrita on 19-May-2015 13:26.

Items

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Variable Availability

Champion abilities

Masteries

  • Sorcery mastery 2014 Sorcery increases cooldown reduction by 1.25 / 2.5 / 3.75 / 5%.
  • Intelligence mastery 2014 Intelligence increases cooldown reduction by 2 / 3.5 / 5%.

Runes

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

GMarks (1)

X X 0.2 %

410 IP Influence Point

Seal

GSeals (1)

X X 0.36 %

410 IP Influence Point

Glyph

GGlyphs (1)

0.47 %

5 IP Influence Point

0.67 %

35 IP Influence Point

0.83 %

820 IP Influence Point

Quintessence

GQuintessences (1)

1.4 %

15 IP Influence Point

1.95 %

100 IP Influence Point

2.5 %

2050 IP Influence Point

Cooldown Reduction, Scaling

(Cooldown Reduction per level)

Mark X X X
Seal X X X
Glyph

GGlyphs (2)

X X 0.09 % per level (1.67 %)

410 IP Influence Point

Quintessence

GQuintessences (2)

X X 0.28 % per level (5 %)

1025 IP Influence Point

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

  • Gnar's Gnar's Boomerang Throw Boomerang Throw cooldown is reduced by 50 / 55 / 60% if he can catch it when its return.
    • Boulder Toss Boulder Toss cooldown is reduced by 50 / 55 / 60% if he picks up his boulder after using the ability.
  • Master Yi's Master Yi's Highlander 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 Yasuo's Steel Tempest Steel Tempest's cooldown is reduced by 1% for every 1.72% bonus attack speed he has.
  • Cho'Gath's Cho'Gath's Feast Feast's cooldown is reduced by 50% if it kills a minion or monster.

Cooldown refreshing

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