This guide will cover the Critical Chance derived statistic in Fallout: New Vegas. Derived statistics are a second set of values based on your characters primary S.P.E.C.I.A.L. attributes. There are additional ways of modifying these statistics beyond just increasing your primary attributes and these ways will be covered here, along with information on everything you need to know about Critical Chance. These attributes such as Critical Chance are noticed more often in the mechanics of the game, usually having large impacts on how the game is played.
Critical Chance by definition is the end percentage based modifier that determines how often your attacks are scored as a critical hit. Critical hits are attacks that due to the skill or luck of the aggressor, find a weak spot in the defending creatures hide or armor therefore dealing extra damage. Critical hits typically cause twice as much damage as an ordinary hit, often taking limbs out or killing a weaker enemy outright.
Your Critical Chance can be affected by several different factors in Fallout New Vegas. Each point of luck gives your character a base critical chance of 1%, starting at 1% with Luck 1, then 10% at Luck 10. Dealing damage in VATS gives your shots an additional +15% Critical Chance. Shots fired while successfully sneaking with the Hidden message will always score a critical hit, follow up shots on the same target give you away. Weapons have multipliers to Critical Chance, meaning a weapon with a multiplier of 2, with a character that has a base chance of 10%, will instead have a 20% chance to critically hit.
Critical Chance Modifiers
Finesse: Critical Chance +5%
Ninja: Additional +15% Critical Chance when using melee or unarmed.
Built to Destroy: Critical Chance +3%
Magazines (temporary Crit change in brackets)
True Police Stories: Crit Chance +5% (10% with comprehension)