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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 TacticsEdit

The chance to cause a critical hit in combat is increased by this amount.— Fallout In-game description

An Aimed Shot has a critical chance bonus equal to the chance-to-hit penalty of the targeted body part.[1] In Fallout Tactics, the Science skill also has an effect on critical chance against robotic enemies.

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

The Chance to Hit adds a slight bonus to critical chance if the attack hits the intended target. The formula used to determine whether an attack hits or misses is (Chance to Hit) - (RandomNumberBetween1and100). If the remainder is 0 or more, the attack is a hit. If it's negative, the attack is a miss.

If the attack hits its target, the same random number that was subtracted from the chance to hit is used to calculate the critical chance bonus of the successful hit. This bonus is equal to (ChanceToHit - RandomNumberBetween1and100) / 10 rounded down. Thus if a successful attack's chance to hit was 49%, this critical chance bonus could be anything between 0% (random number is between 40 and 49) and 4% (random number is between 1 and 9).

A successful hit whose chance to hit was 95% has a critical chance bonus ranging from 0% to 9%. The average critical chance bonus of a successful hit with a 95% hit chance is (5x9 + 10x8 + 10x7 + 10x6 + 10x5 + 10x4 + 10x3 + 10x2 + 10x1 + 10x0) / 95 = 4.26%

• 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, but never above 95%.
• The Slayer perk increases the critical chance to 100% for melee and unarmed attacks.

## Fallout 3Edit

### Base ChanceEdit

Luck is the main base factor that determines the chances of a critical strike on an opponent.

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

Example: A starting Luck of 5.

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

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 Guru perk can increase this limit by another +3%.
• Some weapons have 0% chance of a critical strike (see Critical Multiplier below for detail of effects).

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

### Critical MultiplierEdit

All weapons have a critical multiplier that modifies the player character's base critical hit chance. This may improve or hinder the ability to score a critical hit depending on the weapon's 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.

$5\%~(\text{Base chance})\times5~(\text{Critical multiplier})=25\%~(\text{Critical chance})$

Notes

• The critical multiplier for fully-automatic weapons is much lower than for single-shot weapons.
• There are a few weapons that have a x0 multiplier, making it impossible to score a critical hit.
• For a detailed list of weapon critical multipliers, see here.

### Weapon ConditionEdit

The final critical chance is also modified by weapon condition.[2]

$\mbox{Critical chance} \times \mbox{Condition}$

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

$25\%~(\text{Critical chance})\times\frac{50}{100}~(\text{Condition})=12.5\%~\text{Critical chance}$

## Fallout: New VegasEdit

The formulas for critical chance seem unchanged from Fallout 3. You receive 1% of critical chance for each point placed into Luck. During 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
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
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 38% (10 Luck, Finesse, Built to Destroy, 1st Recon Beret, Elite riot gear/Ulysses' Duster, 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 SteelEdit

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%.