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, The 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 at which Action Points deplete while sprinting.

If E is the Endurance level and L is the current character level, then
 * $$HitPoints = 80 + E \times 5$$


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



\begin{align} TotalHitPoints &= HitPoints + (HitPointsPerLevel \times (L - 1)) \\ &= 77.5 + (4.5 \times E) + (2.5 \times L) + (0.5 \times E \times L) \end{align} $$

where the total is rounded down.

Leveling up
In Fallout 4, Endurance is applied retroactively: 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, for example by picking up the Endurance bobblehead or using the You're SPECIAL! book after reaching maximum Endurance, which will allow the player to gain even more HP per level. Hit points are in no way capped.

Sprinting
If E is the Endurance level, Action Points are drained at the following rate while sprinting:
 * $$ActionPointsPerSecond = (1.05 - 0.05 \times E) \times 12$$

In other words, 1 Endurance is equal to a default Action Point drain rate of 12 AP per second, with a reduction of 0.6 AP per second for every additional level of Endurance. At 10 Endurance, the drain rate is 6.6 AP per second.

With rank 3 of the Moving Target perk, the 12 multiplier is changed to a 6.

Since the amount of AP is determined by Agility, the total sprinting time depends on both Endurance and Agility. If the sum of Agility and Endurance is below 14, increasing Agility will increase the total sprinting time more than raising Endurance. When the sum is above 14, increasing Endurance will be more effective. This is true even with rank 3 of the Moving Target perk.

The values in the above formula are defined by the following game settings:
 * fSprintActionPointsDrainMult = 12.0
 * fSprintActionPointsEndBase = 1.05
 * fSprintActionPointsEndMult = -0.05

21 Endurance will reduce sprint AP drain to zero, regardless of AP cost-reducing perks and armor mods.

Ways to increase Endurance

 * Permanent
 * Level (+1)
 * Endurance bobblehead (+1)
 * You're SPECIAL! book (+1)
 * SCAV! - Motivationally Moneyless (+1/2/3, depending on amount caps in the inventory.)


 * Temporary
 * Various armor and clothing
 * Legendary armor effects
 * Chems
 * Several perks
 * Settlement objects
 * Power Cycle 1000 (+1)

Fallout 76
Modifies: Disease Resistance, Hit Points and the rate at which Action Points deplete while sprinting.

As with other Fallout 76 SPECIAL attributes, endurance has a maximum of 15 but there are only 49 points split between the 7 attributes.

At the starting Endurance of 1, the maximum Hit Points (HP) is 250. Each level, it increases by 5 HP. At the maximum Endurance of 15, the maximum HP is 320.

Similarly, at the starting Endurance of 1, the sprinting Action Point (AP) drain is reduced by 5%. Each addition level of Endurance reduces the drain by a further 5%. At the maximum Endurance of 15, sprinting AP drain is reduced by 75%. This means that with the same number of AP points between them, a character with Endurance = 15 is able to sprint four times as long as a theoretical character with Endurance = 0.

Ways to increase Endurance
Note that all stat boosts in Fallout 76 are temporary.
 * Bobblehead: Endurance (+2 for 1 hour or 2 hours with Curator)
 * Armor and clothing:
 * "Brotherhood of Steel", "Marine", or "Vault suit" underarmor with a treated lining mod (+1)
 * "Secret Service" underarmor with a treated lining mod (+2)
 * "Marine" or "Vault suit" underarmor with a resistant lining mod (+1)
 * "Brotherhood of Steel" underarmor with a resistant lining mod (+2)
 * "Vault suit" underarmor with a protective lining mod (+1)
 * "Brotherhood of Steel" or "Marine" underarmor with a protective lining mod (+2)
 * "Secret Service" underarmor with a protective lining mod (+4)
 * "Marine" or "Vault suit" underarmor with a shielded lining mod (+2)
 * "Brotherhood of Steel" underarmor with a shielded lining mod (+3)
 * "Secret Service" underarmor with a shielded lining mod (+4)
 * Legendary Effects:
 * Endurance (+1)
 * Mutations:
 * Herd Mentality (+2 if grouped, -2 if solo)
 * Perks:
 * Solar Powered (+1 to +3 during the day, -1 to -3 during the night)
 * Consumables:
 * Food:
 * Aged mirelurk queen steak (+3)
 * Chitlins con carne (+2)
 * Dog meat steak (+3)
 * Grilled hermit crab (+1)
 * Grilled radroach (+1)
 * Mirelurk queen steak (+2)
 * Mirelurk softshell cake (+3)
 * Mutt chops (+2)
 * Mystery meat pie (+3)
 * Pemmican (+3)
 * Radtoad omelette (+1)
 * Roasted scorchbeast heart (+3)
 * Scorchbeast mixed meat stew (+2)
 * Silt bean soup (+2)
 * Starlight berry cobbler (+1)
 * Drinks:
 * Bourbon (+1)
 * Nuka-Cola Dark (+1)
 * Steeped gourd blossom tea (+2)
 * Chems:
 * Buffout (+2)
 * Bufftats (+3)
 * Psychobuff (+3)
 * X-cell (+2)

Fallout: The Roleplaying Game
Endurance's only derived statistic is a character's Health Points. Endurance is used as the default for skill tests involving Big Guns and Survival.

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

Fallout: The Board Game
Unlike other games, Endurance is not treated as a variable ranging from 1 to 10, but instead as a token that can be obtained at the start or when leveling up. A player character with the Endurance token gets free rerolls during certain tests, as well as during fights if equipped with an Endurance-based weapon. Endurance is also used to resist addiction when using drugs.

Any player character wearing T-60 power armor is treated as having Endurance. During Endurance tests or fights, the vault suit gives its wearer one additional reroll, while anyone wearing the hazmat suit gains one free hit. Also during any Endurance test or fight, Buffout can be used to gain one free hit.

Endurance-based perks

 * Lead Belly
 * Toughness

Endurance-based weapons

 * Fat Man
 * Minigun

Behind the scenes
Endurance was tied to the scrapped survival mechanics in early stages of Fallout 2s development.