Fallout 3 derived statistics

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This page lists all derived statistics in Fallout 3.

• The content is not described in full detail on this page. For details, please see the respective articles.
• For derived statistics in other Fallout games, please see "Derived statistic".
• For an overview of Fallout 3 content, please refer to "Portal:Fallout 3."

List

Derived statistic	Description	Derived from	Initial value
Action Points	The higher the number, the more actions can be accomplished before another entity (whether friend or foe) reacts.	Agility	$65+2\times\text{Agility}$
Carry Weight	How much can be carried before becoming overencumbered.	Strength	$150+\text{Strength}\times10$
Compass Distance	How far away enemies can be while still showing up as a red bar on the HUD compass.	Perception	Unknown
Critical Chance	Chance that a hit will inflict Critical Damage.	Luck	$\text{Luck}\% = \frac{\text{Luck}}{100}$
Damage Resistance	All damage received is reduced by this percentage.	Armor	0
Disposition	Modifies Speech check difficulty on top of actual skill.	Charisma	If viewed from the same scale as skill, $\text{Charisma} \times 5$
Fire Resistance	All fire damage received is reduced by this percentage.	Armor	0
Hit Points	How much damage can be taken before dying.	Endurance	$\text{Initial level}=90+(\text{Endurance}\times20)+(\text{Level}\times10)$
Lung Capacity	How long the player can stay underwater before beginning to drown.	Endurance	Unknown
Melee Damage	Bonus damage with Melee Weapons.	Strength	$\frac{\text{Strength}}{2}$
Poison Resistance	All poison damage received is reduced by this percentage.	Endurance	$\left(\text{Endurance}-1\right)\times5\%$
Radiation Resistance	How adept the player's body is at ignoring exposure to radiation.	Endurance	$\left(\text{Endurance}-1\right)\times2\%$
Skill Rate	How many skill points the player character gains per level.	Intelligence	$10+\text{Intelligence}$
Unarmed Damage	Damage done with fists (damage of Unarmed weapons is added to this value.)	Endurance and Luck (Unarmed skill)	$\begin{align} & \left\lceil\frac{10+\text{Unarmed skill}}{20}\right\rceil \\ & \left\lceil\frac{12+\text{Invested Skill Points}+2\times\text{Endurance}+\left\lceil\frac{\text{Luck}}{2}\right\rceil}{20}\right\rceil \\ \end{align}$