A critical strike is a basic attack that deals twice its normal damage. In the real world, it's an attack striking a vulnerable area, while in other MMO and/or RPG settings, it ties into the very common "critical hit" mechanic.
It only applies to basic attacks or certain abilities like 
Gangplank's 
Parrrley and 
Yasuo's 
Steel Tempest that act like a basic attack or 
Garen's 
Judgment and 
Master Yi's 
Alpha Strike, which are specially stated. It's important to note that you cannot score a Template:Cctip against a building such as a turret or inhibitor (Except 
Jhin, whose fourth shot receives minicrits against all structures).
Most champions have different attack animations for a Template:Cctip, though some do not; this includes mages and other champions not meant to be built using basic attacks for damage. Some of these champions performing a Template:Cctip (if built being able to perform them) may instead have a soundbite that plays in place of an animation, typically a grunt of effort.
Template:Cctip is valuable for all champions who primarily deal damage with basic attacks, rather than through abilities. Some champions, such as 
Ashe, have an affinity for critical hits and benefit more from items that improve them. Players can increase the Chance and the Damage of Template:Cctip with items, abilities, and runes.
Chance
Critical strike chance, as the name states, is the chance of a champion's physical attacks dealing a critical strike. Critical strike chance stacks additively. Runes, items, and all abilities can increase critical strike chance.
When averaged over a large number of autoattacks and at Base critical damage (100% bonus damage), critical strike chance is essentially a damage multiplier where each 1% of critical chance adds 1% bonus damage. Thus at 50% critical strike chance a champion will be doing (on average) 150% damage with autoattacks, not counting Bonus critical strike damage. Because of this, critical strike chance scales well with both attack damage and attack speed. The formula for this damage multiplier is given by:
Damage multiplier = 1 + (Critical chance × (1 + Bonus critical damage))
The maximum critical strike chance you can reach at level 1 through masteries is 20.25%, excluding abilities and items, and is hard capped at 100%.
Critical strike chance has a theoretical gold value of 
40 per 1% critical strike chance. This makes 
Brawler's Gloves the most efficient core item for critical strike chance, as it grants +10% critical chance for the cost of 400 with a 40 per 1% critical chance efficiency. Note that 
Cloak of Agility has the same efficiency.
Increasing critical strike chance
Items
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Champion abilities
Note: Any ability boosting attack speed has an indirect impact on the number of crits.
Fiora's Bladework grants her 100% critical chance on her next second attack.- Jhin's Whisper passively grants him 100% critical chance every fourth basic attack.
- Curtain Call has a guaranteed 100% critical chance on its fourth and final shot.
- Pantheon's Certain Death grants him 100% critical chance against targets below 15% of their maximum health.
- Rengar's Thrill of the Hunt grants him 100% critical chance for his next basic attack against his closest target.
- Shaco's Backstab passively grants him 100% critical chance for every basic attack striking an enemy unit from behind. This cannot happen on the same target more than once every 3 seconds.
- Talon's Noxian Diplomacy grants him 100% critical chance if he hits its target within a 170 range.
- Tryndamere's Battle Fury grants him 0.35% critical chance per point of Fury he currently has.
- Xin Zhao's Battle Cry passively grants him 100% critical chance on every third basic attack.
- Yasuo's Way of the Wanderer grants him twice the amount of critical chance.
Runes
Damage
Critical strike damage refers to the amount of damage that a champion's Template:Cctip will deal. All champions have 200% critical strike damage by default, except Ashe with 110% damage, Jhin with 150% (reduced to 112% vs structures) and Yasuo with 180%. In most cases, critical strike damage stacks additively. Damage modifiers apply to critical strike damage normally.
Modifying Critical Strike Damage
- Champion Abilities
- Fiora's Bladework modifies her base critical damage to 140 / 155 / 170 / 185 / 200% from the default of 200%.
- Jhin's Whisper multiplicatively reduces his total critical damage by 25% for basic attacks.
- Shaco's Backstab modifies his base critical damage to Error: Parameter '3' is not accepted. from the default of 200%.
- Xin Zhao's Battle Cry modifies his base critical damage to 125 / 137.5 / 150 / 162.5 / 175% from the default of 200%.
- Yasuo's Intent multiplicatively reduces his total critical damage by 10% for basic attacks and 25% for Steel Tempest (e.g. 200% to 190% / 175%).
- Note: Ashe's Frost Shot does not modify the base critical damage. Instead, it does the following:
- Only allows critical strikes on auto-attacks against targets affected by Frost.
- Removes the randomness of critical strikes. It does so by simultaneously increasing the proc probability to 100% and reducing the extra damage on proc by the same multiplicative factor.
- Adds straight 10% multiplicative bonus damage that is unrelated to critical strikes.
- Only allows critical strikes on auto-attacks against targets affected by
Items
Runes
Notes
- The maximum bonus critical strike damage obtainable is 95.51%, as follows:
- For most champions, the maximum critical strike damage available is 200% for a total of amount of 295.51% AD on their Template:Cctip.
- Ashe with 100% critical strike chance will deal 305.51% AD on her Template:Cctip thanks to her innate passive Frost Shot.
Skills affected by Critical Chance
Certain skills are capable of Template:Cctip and/or are affected by critical chance.
- Most of them only do bonus 100% AD × (Total critical damage − 100%) if they Template:Cctip.
- Blitzcrank's Power Fist
- Caitlyn's Headshot: Against champions.
- Darius' Crippling Strike
- Draven's Spinning Axe
- Gangplank's Parrrley
- Garen's Decisive Strike
- Jinx's Switcheroo!
- Nautilus' Staggering Blow
- Nidalee's Takedown: Magic damage, benifiting from Life steal.
- Nocturne's Umbra Blades
- Quinn's Harrier
- Renekton's Ruthless Predator: Only applicable to first hit.
- Riven's Runic Blade
- Shyvana's Twin Bite: Only applicable to first hit.
- Trundle's Chomp
- Vayne's Tumble
- Viktor's Discharge: Magic damage, benifiting from Life steal.
- Volibear's Rolling Thunder
- Wukong's Crushing Blow
- Xin Zhao's Three Talon Strike
- Others
- Caitlyn's Headshot: Template:Cctip do bonus 250% AD × (Total critical damage − 100%) against minions and monsters.
- Garen's Judgment: Template:Cctip do bonus entire damage portion × (Total critical damage − 100%).
- Jayce's Hyper Charge: Template:Cctip do bonus entire damage × (Total critical damage − 100%).
- Jhin's Curtain Call: The final shot is a Template:Cctip, doing bonus 100% AD × (Total critical damage − 100%).
- Lucian's Lightslinger: The additional shot does bonus entire damage × (Total critical damage − 100%) if it is a Template:Cctip.
- Master Yi's Double Strike: The additional strike does bonus 50% AD × (Total critical damage − 100%) if it is a Template:Cctip.
- Alpha Strike: Template:Cctip do bonus 60% AD × (Total critical damage − 100%).
- Miss Fortune's Double Up: The second bounce can Template:Cctip dealing bonus entire damage × (Total critical damage − 100%). If the first bounce kills it's target, the second bounce will always Template:Cctip.
- Bullet Time: Each wave can Template:Cctip, dealing 20% × (Total critical damage − 100%) bonus damage.
- Nasus' Siphoning Strike: Template:Cctip do bonus base damage × (Total critical damage − 100%).
- Yasuo's Steel Tempest: Template:Cctip do bonus 75% AD × (Total critical damage − 100%).
- Additions
- Shaco's Backstab: Template:Cctip do increased damage after critical modifier.
- Tryndamere's Spinning Slash: Cooldown is reduced by 1 second for every Template:Cctip. This effect is doubled against champions.
Miscellaneous
Other skills that are not being affected by critical strikes and chances are displayed as a critical strike due to other reasons.
- Affected by Critical strike damage
- Unaffected by Critical strike damage
- Anivia's Frostbite: The 2 × damage modifier applied by being chilled by Flash Frost is given out as a Template:Cctip.
- Evelynn's Whiplash: While Demon Shade is active, the next cast of Whiplash is empowered and deals extra damage, given out as a Template:Cctip.
- Last Caress: The double damage dealt to enemies under 30% of their maximum health is given out as as a Template:Cctip.
- Fizz's Seastone Trident: The triple damage dealt to a target that has been bleeding for more than 2 seconds is given out as a Template:Cctip.
- Gnar's GNAR!: The damage is given out as a Template:Cctip when enemy hits terrain.
- Gragas' Barrel Roll: The damage is given out as a Template:Cctip when the cask ferments after 2 seconds.
- Karthus' Lay Waste: Appears as a Template:Cctip when acting like a single target spell (hitting only one enemy).
- Kog'Maw's Living Artillery: The double damage dealt to enemies under 40% of their maximum health is given out as a Template:Cctip.
- LeBlanc's Sigil of Malice: When the sigil is shattered by Leblanc's next ability against the target, the combined damage of the sigil and the ability is given out as a Template:Cctip.
- Nidalee's Takedown: The 40% increased damage dealt to Hunted targets is given out as a Template:Cctip.
- Pantheon's Spear Shot: Will Template:Cctip for a +50% damage bonus due to the passive from Certain Death if the target is under 15% health.
- Ryze's Overload: The extra damage applied to a target marked with Flux is given out as a Template:Cctip.
- Vayne's Condemn: The double-damage applied by being knocked into a wall is given out as a Template:Cctip.
- Vladimir's Transfusion: The extra damage applied when under the effect of Crimson Rush is given out as a Template:Cctip.
- Ziggs' Satchel Charge: The damage is given out as a Template:Cctip when used to hexplode a tower.
Trivia
- Similarly 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 form, as a means to help finish off targets faster as well as to deal more damage in bursts overall.
- 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.
- The fastest way to obtain 100% critical strike chance is with Yasuo, requiring only 1200:
- Runes: +20.25% Critical Strike Chance
- 9 × Marks of Critical Strike Chance (+0.93% × 9 Critical Strike Chance)
- 9 × Seals of Critical Strike Chance (+0.42% × 9 Critical Strike Chance)
- 9 × Glyphs of Critical Strike Chance (+0.28% × 9 Critical Strike Chance)
- 3 × Quintessences of Critical Strike Chance (+1.86% × 3 Critical Strike Chance)
- 9 ×
- Items: +30% Critical Strike Chance
- Brawler's Gloves (+10% Critical Strike Chance)
- Cloak of Agility (+20% Critical Strike Chance)
- Critical Strike Chance Amplification: 100% Critical Strike Chance
- Way of the Wanderer (+ 100% Critical Strike Chance)
- Relevant mathematics:
- Yasuo Critical Strike Chance = (20.25% + 30%) × 2 = 100.5% critical chance
- Runes: +20.25% Critical Strike Chance
| 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  Movement speed ·  Range
|
| Other |  Experience ·  Gold generation
|