Critical Chance

Critical Chance is a derived statistic in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout Tactics and Fallout: Brotherhood of Steel.

Fallout, Fallout 2 and Fallout Tactics
An Aimed Shot has a higher chance to score a critical hit than an unaimed shot. In Fallout Tactics, the Science skill also apparently has an effect on critical chance against robotic enemies.


 * $$\text{Initial level}=\text{Luck}\times1\%$$


 * The Finesse trait increases the critical chance by 10%.
 * The More Criticals perk increases the critical chance by 5% per rank.
 * The Sniper perk increases the critical chance to 10*Luck for ranged weapons.
 * The Slayer perk increases the critical chance to 100% for melee weapons.

Base Chance
Luck in the main base factor that determines the chances of a critical strike on a opponent.


 * $$\text{Initial level}=\text{Luck}\times1\%$$

Example: A starting Luck of 5.


 * $$5\times 1=5\%~(\text{Base chance})$$

Notes:
 * Maximum initial base is capped at 10%.
 * Ninja perk can increase this limit by another +15% for Melee and Unarmed weapons.
 * Finesse perk can increase this limit by another +5%.
 * Survival Expert perk can increase this limit by another +3%.
 * Strikes dealt in V.A.T.S have additional +15% critical chance added.
 * Some weapons have 0% chance of a critical strike (see Critical Multiplier for detail of effects).

You can also check your critical chance with the console command: player.getav critchance

Critical Multiplier
All weapons have a critical multiplier that modifies the player's base critical chance to create a new percentage to score a critical hit. This may improve or hinder the player's ability to score a critical hit depending on the weapons Critical multiplier.


 * $$\text{Base Chance}\times\text{Critical Multiplier}$$

Example: A starting Luck of 5 and using a Sniper Rifle, which has a x5 Critical Multiplier.


 * $$5\times 1=5\%~(\text{Base chance})\times5~(\text{Critical Multiplier})=25\%~(\text{Critical Chance})$$

Notes
 * The critical multiplier for fully automatic weapons is much lower than for single-shot weapons.
 * There are a few weapons that have a x 0 multiplier, which makes it impossible to score a critical hit
 * For a detailed list of weapon critical multipliers see Fallout 3 weapons.

Weapon Condition
The final critical chance is also modified by weapon condition.


 * $$\mbox{Base chance} \times \mbox{Critical multiplier} \times \mbox{Condition}$$

For example, a character with 5 Luck and using a Sniper Rifle in 50% condition would have,


 * $$5\times 1=5\%~(\text{Base chance})\times5=25\%~(\text{Critical multiplier})\times50\%~(\text{Condition})=12.5\%~\text{Critical chance}$$

Fallout: New Vegas
The formulas for critical chance seem unchanged from Fallout 3. You receive 1% of critical chance for each point placed into Luck. At character creation you can add an additional 3% for all weapons by choosing the Built to Destroy trait.


 * Attributes, perks and traits that increase critical chance include:
 * Luck (permanent +1-10%)
 * Built to Destroy (permanent +3%)
 * Light Touch¹ (temporary +5% while wearing any light armor)(Dead Money)
 * Finesse (permanent +5%)
 * Ninja² (permanent +15% for melee and unarmed weapons)
 * Laser Commander¹ (permanent +10% with lasers).
 * Set Lasers for Fun¹ (permanent +2/4% with energy weapons)
 * Meat of Champions (temporary +1 Luck when eating a fresh corpse)
 * Intense Training (permanent +1 Luck if selected)
 * Luck Implant (permanent +1 Luck if purchased)
 * ¹ The critical chance added by these perks is a flat bonus and is not affected by your weapon's critical multiplier.
 * ² Ninja multiplies your total critical chance after all modifiers by 1.15; thus it adds 15% of your normal critical chance, not a flat 15% boost.


 * Items that increase critical chance:
 * 1st Recon beret (+5%)
 * Naughty Nightwear (+1 Luck, effective +1%)
 * True Police Stories (temporary +5% (+10% with Comprehension))
 * Vault-Tec Assisted Targeting System¹ (temporary +5% critical hit chance when using VATS)
 * Lucky shades (+1 Luck, effective +1%)
 * Joshua Graham's Armor (+3%)(Honest Hearts)
 * Salt-Upon-Wounds' helmet (+2%)(Honest Hearts)
 * ¹ The critical chance added by V.A.T.S. is a flat bonus and is not affected by your weapon's critical multiplier.

Currently, the highest possible critical chance that will be affected by your multiplier is 36% (10 Luck, Finesse, Built to Destroy, 1st Recon Beret, Joshua Graham's Armor, True Police Stories with Comprehension). As mentioned above, Light Touch, Laser Commander, Set Lasers for Fun, Ninja, and V.A.T.S. can further increase your chance.

Fallout: Brotherhood of Steel
In Fallout: Brotherhood of Steel, a critical hit allows to exceed the maximum limit of damage for a weapon.

Some weapons are very powerful with a high critical chance, such as the Double-Barrel Shotgun or The Slugger and also the weapons in bursts.

An energy weapon with the skill Energy Charge or a Melee weapon with the skill Special Attack can be extremely powerful if the charged attack is a critical hit.

The chance to cause a critical hit in combat is increased by

Initial Level: Each character starts with a 1% critical chance.


 * The Butcher skill (only Cain) increases the critical chance by 5% only for blades for each ranks until a total of 25%.
 * The Desert Soldier skill (only female character) increases the critical chance by 5% only for conventional weapons (weapon that uses 9mm) for each ranks until a total of 25%.
 * The Future Woman skill (only female character) increases the critical chance by 5% only for energy weapons for each ranks until a total of 25%.
 * The Heavy Hitter skill (only human male character) increases the critical chance by 5% only for Blunt weapon (Gloves, Clubs and Hammers) for each ranks until a total of 25%.
 * The Pyromaniac skill (only Cain) increases the critical chance by 5% when using a fire-based weapon (like the frag grenade, flamer, etc.) for each ranks until a total of 25%.
 * The Slayer skill increases the critical chance by 5% for each ranks until a total of 25%.
 * The Wastelander skill (only human male character) increases the critical chance by 10% only when using home-made weapons for each ranks until a total of 50%.

The type of weapon with a maximum critical chance with the skill required is the home-made weapons with a total of 75%.

Gallery
Szansa na trafienie krytyczne Шанс на критическое попадание