A critical strike is a damage effect that deals 175% of its normal damage by default, denoted as 
critical strike damage. This can occur on some items and abilities, and almost always on basic attacks. Depending on the effect, a critical strike would occur under specific conditions, or based on 
critical strike chance.
The most common form of critical strike occurs on 
basic attacks, which cannot critically strike structures. The exceptions are 
Fiora's 
Bladework, 
Jhin's 
Whisper, 
Master Yi's 
Double Strike, and 
Rengar's 
Savagery.
Champions can increase their chances to critically strike and the damage they deal with critical strikes using items and abilities. Critical strikes are especially valuable for champions who deal damage primarily with basic attacks rather than abilities. Some champions, like 
Ashe, have an affinity for critical strikes and benefit more than others from items that improve them.
Critical strike chance
Critical strike chance is a statistic that denotes the probability that a basic attack will critically strike, as well as some other effects that use critical strike chance.
Critical strike chance is not granted naturally by level-ups, it can be increased with items and abilities; it also 
stacks additively. It cannot be increased beyond 100%, although some effects will benefit from the excess despite the cap.
Gold Value
: Critical strike chance has a gold value of 
40 per point.
The probability of a critical strike changes dynamically based on how many times the attack critically strikes. If an attack does not critically strike over multiple attempts, the probability will progressively increase for future attempts—this can occur vice versa, where multiple successful critical strikes will cause the probability to progressively decrease for future attempts.
When averaged over a high number of basic attacks (i.e. calculating damage per second), critical strike chance is essentially a damage multiplier. At base critical damage (75% bonus damage) every 1% of added critical chance adds 0.75% bonus damage. For example, the damage dealt with basic attacks by a champion with 50% critical strike chance and base critical damage is on average 137.5% of the damage they would deal if they had 0% critical strike chance. For this reason, the critical strike chance scales well with both attack damage and attack speed. The formula for this damage multiplier is:
- Damage multiplier = 1 + (Critical chance × (0.75 + Bonus critical damage))
Increasing critical strike chance
Items
This table is automatically generated based on the data from Module:ItemData/data.
| Item | Cost | Amount | Availability |
|---|---|---|---|
 Bloodthirster | 3400 | 20% | All maps |
 Bloodward | 3400 | 20% | All maps |
 Cloak of Agility | 600 | 15% | All maps |
 Essence Reaver | 2800 | 20% | All maps |
 Galeforce | 3400 | 20% | All maps |
 Guinsoo's Rageblade | 2600 | 20% | All maps |
 Immortal Shieldbow | 3400 | 20% | All maps |
 Infinity Edge | 3400 | 20% | All maps |
 Kraken Slayer | 3400 | 20% | All maps |
 Lord Dominik's Regards | 3000 | 20% | All maps |
 Mercurial Scimitar | 3000 | 20% | All maps |
 Mortal Reminder | 2500 | 20% | All maps |
 Navori Quickblades | 3400 | 20% | All maps |
 Phantom Dancer | 2600 | 20% | All maps |
 Rapid Firecannon | 2500 | 20% | All maps |
 Runaan's Hurricane | 2600 | 20% | All maps |
 Stormrazor | 2700 | 20% | All maps |
 The Collector | 3000 | 20% | All maps |
 Typhoon | 3400 | 20% | All maps |
 Wyrmfallen Sacrifice | 3400 | 20% | All maps |
 Zeal | 1050 | 15% | All maps |
Champion abilities
Critical strike chance as scaling
Some game elements scale with the champion's amount of critical strike chance.
Champion abilities
Akshan's Comeuppance- Ashe's Frost Shot
- Caitlyn's Headshot
- Gangplank's Trial by Fire and Powder Keg
- Jhin's Whisper
- Kindred's Mounting Dread
- Lucian's The Culling
- Nilah's Formless Blade and Apotheosis
- Quinn's Harrier
- Rengar's Savagery
- Senna's Absolution
- Sivir's Boomerang Blade
- Tristana's Explosive Charge
- Viego's Blade of the Ruined King and Heartbreaker
- Xayah's Bladecaller
- Xin Zhao's Wind Becomes Lightning
- Yasuo's Way of the Wanderer
- Yone's Way of the Hunter
Items
Modifying critical strike damage
General
- In most cases, critical strike damage stacks additively.
- Damage modifiers apply to critical strike damage normally.
Champion abilities
- Ashe's Frost Shot
- Fiora's Bladework
- Jhin's Whisper
- Senna's Absolution
- Shaco's Deceive when used to Backstab
- Yasuo's Way of the Wanderer
- Yone's Way of the Hunter
Items
Guaranteed critical strikes
Some game elements can critically strike with no dependence on critical strike chance.
Champion abilities
- Ashe's Volley
- Fiora's Bladework's second attack
- Jhin's Whisper's fourth attack and Curtain Call's fourth shot
- Kindred's Mounting Dread against low health enemies
- Rengar's Savagery
- Shaco's Deceive when used to Backstab
- Talon's Noxian Diplomacy when used in melee range
- Zeri's Ultrashock Laser when it collides with terrain
Game elements that can critically strike
Champion abilities
- Basic attack modifiers
Many abilities in the game enhance basic attacks, causing them to deal increased damage. Since these are basic attacks, they can critically strike, with a few exceptions (see below), however, the ability's damage itself will only be amplified by a critical strike for the following abilities.
- Akshan's Dirty Fighting and Heroic Swing
- Aphelios' Infernum and Crescendum
- Bel'Veth's Void Surge
- Darius' Crippling Strike
- Galio's Colossal Smash
- Graves' New Destiny
- Hecarim's Devastating Charge
- Jayce's Hyper Charge
- Jinx's Switcheroo!
- Lucian's Lightslinger
- Master Yi's Double Strike
- Nasus' Siphoning Strike (only the base damage)
- Pantheon's Shield Vault with Mortal Will empowered basic attacks
- Rek'Sai's Queen's Wrath (only to primary target)
- Riven's Runic Blade
- Shaco's Backstab and Deceive with Backstab
- Shyvana's Twin Bite
- Viego's Blade of the Ruined King
- Volibear's Thundering Smash
- Xin Zhao's Three Talon Strike
- Other abilities
- Aphelios' Onslaught, Duskwave, Sentry and Moonlight Vigil
- Gangplank's Parrrley and Powder Keg
- Garen's Judgment
- Kayle's Fire Waves and Starfire Spellblade (while Aflame)
- Master Yi's Alpha Strike
- Miss Fortune's Double Up and Bullet Time
- Samira's Flair and Inferno Trigger
- Sivir's Ricochet
- Twitch's Spray and Pray
- Vi's Relentless Force
- Yasuo's Steel Tempest
- Yone's Mortal Steel
- Zeri's Burst Fire and Lightning Crash's physical damage chain
Items
Some items that deal bonus damage can critically strike if the basic attack that triggers them critically strikes.
Basic attacks that cannot critically strike
- Camille's Precision Protocol - both enhanced attacks cannot critically strike.
- Fiora's Bladework - the first attack cannot critically strike.
- Twisted Fate's Pick a Card - enhanced attack cannot critically strike.
- Zac's Stretching Strikes - enhanced attack cannot critically strike.
- Zeri's Basic Attacks - cannot critically strike.
Critically striking against structures
Critical strikes do not affect structures, with the following exceptions:
- Fiora's Bladework - second attack will also critically strike turrets.
- Jhin's Whisper - the fourth attack will also critically strike turrets.
- Master Yi's Double Strike - the additional attack can critically strike turrets.(bug)
- Rengar's Savagery - the first attack will also critically strike turrets.
Interacting with critical strikes
- Aphelios' Infernum sprays 6 missiles in a wider cone when critically striking enemies and Crescendum has a reduced wind up percentage when critically striking enemies.
- Graves' New Destiny sprays 6 pellets in a wider cone when critically striking enemies.
- Jhin's Whisper grants him movement speed when critically striking enemies.
- Tryndamere's Spinning Slash reduces its cooldown when critically striking enemies.
- Yasuo's Last Breath grants all critical strikes armor penetration against bonus armor.
- Zeri's Spark Surge will further reduce its cooldown when Burst Fire or Ultrashock Laser critically strikes enemies and Lightning Crash will grant extra stacks when Burst Fire or Ultrashock Laser critically strikes enemies.
- Navori Quickblades makes critical strikes reduce the user's basic ability cooldowns.
Cosmetic critical strikes
Some ability damage is displayed as a critical strike under certain circumstances but do not interact as a critical strike. These are use for cosmetic purposes to indicate high amounts of, empowered, or otherwise significant damage on an ability.
- Aatrox's The Darkin Blade against enemies hit by the far end of the first two casts, as well as the center of the third
- Anivia's Frostbite against enemies recently hit by Flash Frost or a fully formed Glacial Storm
- Bel'Veth's Endless Banquet against champions with her attacks
- Caitlyn's Piltover Peacemaker against enemies hit beyond the first if they were revealed by Yordle Snap Trap
- Evelynn's Empowered Whiplash against the target and Last Caress against enemies under the health threshold
- Fiddlesticks' Terrify against the target if they were recently feared by the ability
- Gnar's GNAR! against enemies that collide with terrain
- Gragas' Barrel Roll against enemies hit after the barrel has fully fermented
- Gwen's Snip Snip! against enemies hit in the center of the cone
- Karthus' Lay Waste against a single target
- Kog'Maw's Living Artillery against enemies under the health threshold
- LeBlanc's Sigil of Malice, Distortion, and Ethereal Chains against enemies marked by Sigil of Malice
- Lillia's Watch Out! Eep! against enemy champions and monsters hit in the center of the area
- Lulu's Glitterlance against enemies hit by both bolts
- Malphite's Thunderclap against the target hit by the first attack
- Mordekaiser's Obliterate against a single target and Realm of Death against the target
- Nidalee's Takedown against the target if they were Hunted
- Pantheon's Comet Spear against enemies under the health threshold
- Pyke's Death from Below against executed enemy champions
- Qiyana's Elemental Wrath (Terrain) against enemies under the health threshold
- Ryze's Overload against enemies marked by Spell Flux
- Samira's Taunt against the enemy hit
- Shaco's Two-Shiv Poison against enemies under the health threshold
- Seraphine's High Note against enemies that take increased damage
- Sett's Haymaker and The Show Stopper both against enemies hit in the center of the area
- Taliyah's Threaded Volley when casting on Worked Ground
- Urgot's Fear Beyond Death against the executed target
- Varus' Piercing Arrow against enemies hit if the ability was fully charged (includes Blighted Quiver's bonus damage)
- Vayne's Condemn against the target if they collide with terrain
- Vex's Doom 'n Gloom against targets marked wtih Gloom
- Vladimir's Transfusion against the target if the ability was empowered by Crimson Rush
- Volibear's Frenzied Maul against the target if they are Wounded and Stormbringer against enemies hit in the center of the area
- Yorick's Mist Walkers upon leaping to enemies marked by Mourning Mist
- Zeri's Basic Attack against executed targets
- Ziggs' Satchel Charge against turrets below the health threshold
- Rift Herald's charge against turrets
- Rift Scuttler's shield when it is destroyed by crowd control or Smite
- Serpent's Fang's Shield Reaver against shields
- The Collector's Death and Taxes if the attack which triggered the execute was a critical strike
Trivia
- In many MMO settings, a number of attack damage-based assassins or secondary assassin-based champions also benefit from high critical strike chance in varying forms, as a means to help finish off targets faster as well as to deal more damage in bursts overall.
- Most champions have special basic attack animations when they critically strike, even champions that do not itemize critical strike chance. Other champions have a sound that plays when they critically strike, typically a grunt of effort.
- Some champions may actually use their critical strike animation for their empowered-basic attack if they ever activate a single-use on-hit effect, only it does not actually count as an actual critical strike.
| Offensive |  Ability power ·  Attack damage ·  Attack speed · Critical strike chance · Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Omnivamp · Physical vamp ·  True damage
|
|---|---|
| Defensive |  Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
|
| Utility |  Ability haste ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration
|
| Other |  Experience ·  Gold generation ·  Movement speed ·  Range
|
