Critical strike chance
"Critical Strike Chance" redirects here. For the passive skill, see Critical Strike Chance (passive skill).
The chance to deal a critical strike is taken from the weapon used to perform an attack or attack skill. This chance is based on the weapon's base critical strike plus any local critical strike mods on the weapon. In the case of spells, each spell has its own critical strike chance, which is listed in the skill gem's description. This value can be increased by various modifiers according to
CriticalStrikeChance = (BaseCriticalStrikeChance + AdditionalCriticalStrikeChance) * (1 + IncreasedCriticalStrikeChance)
where BaseCriticalStrikeChance is the base critical strike chance of the skill or weapon, AdditionalCriticalStrikeChance is the sum of all relevant +#% to Critical Strike Chance and IncreasedCriticalStrikeChance is the sum of all relevant #% increased Critical Strike Chance.
For example, if the player is using a weapon with 5% chance to crit, and has +1% to Critical Strike Chance and 50% increased Critical Strike Chance, he will have a 9% chance to score a critical strike.
These types of modifiers can be found on various items, skill gems, the passive skill tree or power charges.