Critical Hit Chance Formula

Variables

fVATSCriticalChanceBonus = V

This value is 0 when outside of VATS mode regardless of the value of the game setting

fWeaponConditionCriticalChanceMult = CM

Weapon condition = C

This value is 10 when your weapon is at 100% condition, 9 at 90%, and etc

Actor luck value = L

fAVDCritLuckBase = LB

fAVDCritLuckMult = LM

Weapon crit multipler specified on the weapon form = WM

Automatic weapons use this value divided by the Fire Rate. For example, an Assault Rifle has a crit multiplier of 1.0, and a Fire Rate of 8. Therefore each bullet has a 0.125 multiplier to the critical percent chance.

Perks that have a "Calculate My Critical Hit Chance" entry point = PerkModifiers(x)=> y

This "variable" is treated as a function that applies all perk modifiers and returns the new critical hit chance

Any effects active on the actor which modify the "Critical Chance" (aka CritChance) actor value = CCB

For example, the Finesse perk is implemented as an ability which applies the "Increase Critical Chance" effect with a magnitute of 5, resulting in a value of 5 for this variable.

Formula

Critical Hit Chance = V + PerkModifiers(C * CM * (LB + L * LM + CCB) * WM)