Endurance

Endurance is one of the seven primary statistics in the SPECIAL system.

Fallout, Fallout 2, Fallout Tactics
Modifies: Hit Points, Poison & Radiation Resistance, Healing Rate, and the additional Hit Points per level.

Ways to increase Endurance

 * In Fallout, the Brotherhood of Steel in Lost Hills can perform an operation to permanently increase Endurance by 1, assuming the Vault Dweller can afford it.
 * Endurance can be permanently raised in Fallout 2 and Fallout Tactics via the Gain perk.
 * Endurance can be temporarily raised by 3 in Fallout and Fallout 2 by using Buffout.
 * The Elixir of Life from Fallout Tactics gives +1 EN and +15 HP.

Fallout 3
Modifies: Hit Points, Poison & Radiation resistance (but not damage resistance) and the Big Guns and Unarmed Skills. Endurance also determines the speed the character's oxygen counter counts down when they are holding their breath underwater.

Ways to increase Endurance

 * Permanent
 * Bobblehead - Endurance (+1)
 * Intense Training perk (+1)
 * No Weaknesses perk (will raise base to 5 if below 5.)
 * Almost Perfect perk (will raise base to 9 if below 9.)
 * Temporary
 * Armor and clothing
 * Brahmin-skin outfit, Mechanist's costume, wasteland settler outfit, wasteland wanderer outfit (+1)
 * Laborer outfit, tattered slave outfit, worn slave outfit (+1)
 * All-nighter nightwear (+1)
 * Buffout (+3)

Fallout: New Vegas
Endurance determines a character's environmental resistances (poison, radiation), Hit Points, and Healing Rate, as well as the starting levels of the Unarmed and Survival skills. It also determines the number of implants allowed.

Ways to increase Endurance

 * Permanent
 * Endurance Implant available at the New Vegas medical clinic (+1)
 * Intense Training perk (+1)
 * Completing the quest The Apocalypse or The End will allow raising any one primary statistic by 1.
 * Temporary
 * Armor and clothing
 * Brahmin-skin outfit, wasteland legend outfit, wasteland settler outfit, wasteland wanderer outfit (+1)
 * Atomic-valence tri-radii-oscillator, Valence radii-accentuator (+1)
 * Advanced riot gear, Courier duster, marked trooper armor (+1)
 * Traits
 * Claustrophobia (+1 while outdoors, but -1 indoors)
 * Early Bird (+2 between 6am and 12pm, but -1 between 6pm and 6am)
 * Buffout (+3)
 * Sierra Madre martini (+4)

Fallout 4
Modifies: Hit Points and the rate that Action Points deplete by while sprinting.


 * $$HitPoints = 80 + Endurance \times 5$$


 * $$HitPointsPerLevel = 2.5 + (Endurance \times .5)$$


 * $$TotalHitPoints = HitPoints + (HitPointsPerLevel \times (CurrentCharacterLevel - 1))$$

rounded down, i.e.:
 * $$TotalHitPoints = 77.5 + (4.5 \times E) + (2.5 \times L) + (0.5 \times E \times L)$$

rounded down, where E = Endurance and L = Current Character Level.

Leveling Up: In Fallout 4 Endurance is retroactive; increasing it later on in the game will still reward you all the hit points you would have gained with a higher initial statistic. An endurance of 10 will grant you 7.5 HP per level (or 7 and 8 every other level, since health is rounded down). It is possible to increase endurance beyond 10 permanently (e.g. picking up a vault tec bobblehead), which will allow the player to gain even more hp per level. There is no Hit Point Cap.

Sprinting

Action Point drain while sprinting:
 * $$ActionPointsPerSecond = (1.05 - 0.05 \times Endurance) \times 12.0$$

Moving Target adds an additional 0.5 multiplier

Game Settings for sprinting:
 * fSprintActionPointsDrainMult = 12.0
 * fSprintActionPointsEndBase = 1.05
 * fSprintActionPointsEndMult = -0.05

Fallout Shelter
Modifies: Dweller's maximum Hit Points.

On each level-up Dweller's maximum HP increases according formula:

$$MaxHitPoints += (BaseEndurance + OutfitEndurance) * 0.5 + 2.5$$;

Dwellers with higher Endurance perform better in Nuka-Cola bottler.

Ways to increase Endurance
By training Endurance in fitness room.
 * Permanent

By equipping outfits that raises Endurance, e.g. wasteland gear.
 * Temporary