Cooldown Reduction (abbreviated as CDR) is a champion statistic that reduces the cooldown of champion abilities, or the amount of time before an ability can be used again after activation, by a percentage. There are some items that separately reduce the cooldown for summoner spells or item active abilities, but do not grant cooldown reduction.
Cooldown reduction can be granted by items, , and runes. CDR stacks additively and is capped at 40%, which can be increased to 45% with the rune.
Cooldown reduction is determined at the moment an ability is activated. Increasing/decreasing cooldown reduction while the skill is on cooldown will not affect the cooldown.
Cooldown reduction does not apply to:
- Static cooldowns.
- Item active abilities (e.g. ).
- Item passive effects with cooldowns (e.g. ).
- Runes.
- Summoner spells.
- Cooldown reduction has a gold value of Template:Gold value math/varExpression error: Unexpected round operator. per point.
Increasing cooldown reduction
Items
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- Unique – Awe: Grants ability power equal to 1% bonus mana. : Passive:
- Unique – Haste: Grants an additional 10% cooldown reduction. : Passive:
- Unique – Enlighten: Upon leveling up, restores 20% of maximum mana over 3 seconds. : Passive:
- Unique – Haste: Grants an additional 10% cooldown reduction. : Passive:
- Unique – Awe: Grants ability power equal to 2% bonus mana. : Passive:
Runes
Champion abilities
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 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
- and
Percentage reduction
- and
Cooldown refreshing
- (rank 3)
Other cooldown reducing effects
Active ability items
- ( , , , , and )
Active Item CDR | |||||||
---|---|---|---|---|---|---|---|
None | |||||||
None | 0% | 15% | 20% | 25% | 30% | 35% | 40% |
5% | 20% | 25% | 30% | 35% | 40% | 45% |
- Notes
- and stack additively with each other while stacks multiplicatively with them.
- Multiple copies of the same active ability item 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
Trivia
Last updated: June 1, 2018 – V8.11
One cost and efficient way to reach maximum CDR (45%) is:
- Having both and , and reaching level 10, giving you 15% CDR.
- Then by buying the which will provide 10% CDR.
- And finally by purchasing a 20% CDR–item.
- Template:Item data Frozen Heart –
- Template:Item data Iceborn Gauntlet –
- Template:Item data Hextech GLP-800 –
- Template:Item data Nashor's Tooth –
- Template:Item data The Black Cleaver –
- Template:Item data Essence Reaver –
- Template:Item data Archangel's Staff –
- Template:Item data Luden's Echo –
- Template:Item data Trinity Force –
The most cooldown reduction any champion can obtain at level 1 with 500 is 20%. To achieve this you must :
- Have the rune which will provide 5% CDR.
- Buy (5% CDR)
- Have the from the (10% CDR)
- Relevant mathematics:
- 5% + 5% + 10% = 20%