Cooldown reduction

 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, buffs, and runes. CDR  stacks additively and is capped at 40%, which can be increased to 45% with the Cosmic Insight 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.

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

• Champion ability cooldowns. (e.g. Lucian's Piercing Light)
• Item active effects. (e.g. Locket of the Iron Solari).
• Item passive effects with cooldowns. (e.g. Guardian Angel).
• Summoner spells. (e.g. Flash)

Cooldown reduction does not apply to:

• Static cooldowns. (e.g. Anivia's Rebirth)
• On-target Cooldowns. (e.g. Jarvan IV's Martial Cadence)
• Interrupted Durations. (e.g. Garen's Perseverance)
• Rune cooldowns.

Gold Value ​​​

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

Increasing cooldown reduction

Items

Unnamed Cooldown Reduction

Item	Cost	Amount	Availability
Abyssal Mask Abyssal Mask	3000	10 %	All maps
Adaptive Helm Adaptive Helm	2800	10 %	All maps
Archangel's Staff Archangel's Staff	3200	10 %	Summoner's Rift
Archangel's Staff (Quick Charge) Archangel's Staff (Quick Charge)	3200	10 %	Howling Abyss
Ardent Censer Ardent Censer	2300	10 %	All maps
Athene's Unholy Grail Athene's Unholy Grail	2100	10 %	All maps
Banshee's Veil Banshee's Veil	3000	10 %	All maps
Black Cleaver Black Cleaver	3000	20 %	All maps
Caulfield's Warhammer Caulfield's Warhammer	1100	10 % (Unique)	All maps
Death's Dance Death's Dance	3600	10 %	All maps
Duskblade of Draktharr Duskblade of Draktharr	2900	10 %	All maps
Essence Reaver Essence Reaver	3300	20 % (Unique)	All maps
Fiendish Codex Fiendish Codex	900	10 % (Unique)	All maps
Forbidden Idol Forbidden Idol	800	10 % (Unique)	All maps
Frozen Fist Frozen Fist	2700	20 %	All maps
Frozen Heart Frozen Heart	2700	20 %	All maps
Glacial Shroud Glacial Shroud	900	10 % (Unique)	All maps
Hextech GLP-800 Hextech GLP-800	2800	10 %	All maps
Hextech Protobelt-01 Hextech Protobelt-01	2500	10 %	All maps
Iceborn Gauntlet Iceborn Gauntlet	2700	20 %	All maps
Infernal Mask Infernal Mask	3000	10 %	All maps
Ionian Boots of Lucidity Ionian Boots of Lucidity	900	10 % (Unique)	All maps
Kindlegem Kindlegem	800	10 % (Unique)	All maps
Knight's Vow Knight's Vow	2200	10 %	All maps
Lich Bane Lich Bane	3200	10 %	All maps
Luden's Echo Luden's Echo	3200	10 %	All maps
Luden's Pulse Luden's Pulse	3200	10 %	All maps
Maw of Malmortius Maw of Malmortius	3250	10 %	All maps
Mikael's Crucible Mikael's Crucible	2100	10 %	All maps
Nashor's Tooth Nashor's Tooth	3000	20 % (Unique)	All maps
Obsidian Cleaver Obsidian Cleaver	3000	20 %	All maps
Redemption Redemption	2100	10 %	All maps
Righteous Glory Righteous Glory	2650	10 %	All maps
Runic Echoes Runic Echoes	1500	10 %	Summoner's Rift
Salvation Salvation	2100	10 %	All maps
Seraph's Embrace Seraph's Embrace	0	10 %	Summoner's Rift
Seraph's Embrace (Quick Charge) Seraph's Embrace (Quick Charge)	0	10 %	Howling Abyss
Sheen Sheen	1050	10 %	All maps
Shurelya's Reverie Shurelya's Reverie	2050	10 %	All maps
Spirit Visage Spirit Visage	2800	10 %	All maps
Stinger Stinger	1100	10 % (Unique)	All maps
Trinity Force Trinity Force	3733	20 %	All maps
Trinity Fusion Trinity Fusion	3733	20 %	All maps
Twin Shadows Twin Shadows	2400	10 %	All maps
Umbral Glaive Umbral Glaive	2400	10 %	All maps
Warmog's Armor Warmog's Armor	2850	10 % (Unique)	All maps
Warrior Warrior	1625	10 %	Summoner's Rift
Youmuu's Ghostblade Youmuu's Ghostblade	2900	10 %	All maps
Youmuu's Wraithblade Youmuu's Wraithblade	2900	10 %	All maps
Zeke's Convergence Zeke's Convergence	2250	10 %	All maps
Zhonya's Hourglass Zhonya's Hourglass	2900	10 %	All maps
Zhonya's Paradox Zhonya's Paradox	2900	10 %	All maps

Named Cooldown Reduction

• Unique – Haste: Grants an additional 10% cooldown reduction.
  • Archangel's Staff
  • Archangel's Staff (Quick Charge)
  • Hextech GLP-800
  • Lost Chapter
  • Luden's Echo
  • Seraph's Embrace
  • Seraph's Embrace (Quick Charge)

Runes

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%
▼ Ultimate CDR
None	0%	20%	40%	45%
0	5%	24%	43%	47.75%
1	10%	28%	46%	50.5%
2	20%	36%	52%	56%
5	25%	40%	55%	58.75%
3	30%	44%	58%	61.5%
4	40%	52%	64%	67%
42	53%	62.4%	71.8%	74.15%
45	65%	72%	79%	80.75%

Notes

• Ultimate Hunter and Cloudbringer's Grace stack additively with each other while normal CDR stacks multiplicatively with them.

Item Effects

Active Item CDR
	None	0	1	2	3	4	5
None	0%	15%	20%	25%	30%	35%	40%
	5%	20%	25%	30%	35%	40%	45%

Notes

• Cosmic Insight and 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 ()	300s ()	240s ()	210s ()	180s ()	90s ()	80s ()	20s ()
▼  Cooldown reduction
5% ()	399s	285s	228s	199.5s	171s	85.5s	N/A	19s
10% ()	378s	270s	216s	189s	162s	81s	N/A	18s
15% ()	357s	255s	204s	178.5s	153s	76.5s	N/A	17s
40% ()	N/A	180s	144s	126s	108s	N/A	48s	12s
43% ()	N/A	171s	136.8s	119.7s	102.6s	N/A	45.6s	11.4s
50% ()	N/A	150s	120s	105s	90s	N/A	40s	10s
52.5% ()	N/A	142.5s	114s	99.75s	85.5s	N/A	38s	9.5s

Runes

• Only 1 rune in the entire game has a way to reduce its cooldown. That rune being 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.

Trivia

Champion statistics

Offensive	Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Spell vamp ·  True damage
Defensive	Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
Utility	Cooldown reduction ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration
Other	Experience ·  Gold generation ·  Movement speed ·  Range