Critical Hit Chance Formula

Critical Hit Chance = PerkModifiers(ConditionPenalty * (LuckBonus + CritChanceBonuses) * WeaponMultiplier) + VATSBonus

PerkModifiers is a function that modifies the input value using any perks active on the actor that have a "Calculate My Critical Hit Chance" Entry Point and returns the result.

ConditionPenalty = WeaponCondition * fWeaponConditionCriticalChanceMult

• fWeaponConditionCriticalChanceMult defaults to: 0.1
• WeaponCondition is 10 at 100% condition, 5 at 50% condition, and etc.

LuckBonus = fAVDCritLuckBase + ActorLuckValue * fAVDCritLuckMult

• fAVDCritLuckBase defaults to: 0
• fAVDCritLuckMult defaults to: 1
• ActorLuckValue is the actor's luck value.

CritChanceBonuses are granted by certain abilities. For example, the Finesse perk is implemented as an ability which applies the "Increase Critical Chance" effect with a magnitude of 5, resulting in a value of 5 for CritChanceBonuses.

WeaponMultiplier is the "Crit % Mult" specified on the weapon form. For automatic weapons, this value is divided by the "Fire Rate", also specified on the weapon form. For example, an Assault Rifle has a "Crit % Mult" of 1.0, and a "Fire Rate" of 8, so the WeaponMultiplier will be 0.125.

VATSBonus = fVATSCriticalChanceBonus

• fVATSCriticalChanceBonus defaults to: 15

  This value is zero unless the attack is being made using VATS.