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For the overview of battledress throughout the Fallout series, see Fatigues.
Fallout: New Vegas
Governed ByEndurance
Initial ValueVaries
Fallout 4
ModifiesAction Points
Governed BySleep

Fatigue is a derived statistic in the Hardcore mode of Fallout: New Vegas and Survival difficulty of Fallout 4.

Overview[edit | edit source]

Fallout: New Vegas[edit | edit source]

Fatigue is a measurement of how much of a special type of damage (Fatigue damage) a character can take before they are knocked down in a state resembling unconsciousness.

If a creature or non-player character suffers enough Fatigue damage to reduce their Fatigue level to 0 or below, the value is immediately set to -30 and the non-player character will enter a state similar to unconsciousness. While in this state the non-player character cannot move or react, but is still considered alive and can suffer normal damage, up to death. Unlike unconsciousness in Fallout 3, "fatigued" or "knocked out" non-player characters cannot be looted; any attempts to interact with them will fail with the message "<NAME> is Unconscious".

Fatigue is a "self-restoring" value, in the sense that it restores back to its maximum value over time. If an non-player character suffers Fatigue damage, their Fatigue value will slowly raise at a rate of one point per second until it is back at its maximum. Fatigue maximums range from 50 (low-level creatures such as mole rats) to 760 (Legate Lanius). Though fatigue values are modified by the non-player character's Endurance and Level, the value is derived from a "base" Fatigue value, set individually for each non-player character or creature. The approximate average Fatigue rating for humanoid non-player characters is 250.

Once the Fatigue value of an non-player character dips below 0 it is immediately set to -30. From this point it will increase at a rate of one point per second. Additional Fatigue damage can be applied to a "Fatigued out" non-player character, but it cannot lower the value below -30. Once the non-player characters Fatigue level climbs back to 0 they will become responsive again, and the non-player character's Fatigue level will be restored to its maximum value.

Equation[edit | edit source]

\text{Fatigue}=\text{Base Fatigue}\times(1+(\text{Endurance}\times0.2)+(\text{Level}\times0.1))

In plain terms, this means that for every level the non-player character's Fatigue rating is increased by 10% of the base value, and for every point of Endurance the rating is increased by 20% of the base value.

Damage sources[edit | edit source]

The number of sources which induce Fatigue damage are limited. Only five weapons inherently cause Fatigue damage: boxing gloves, boxing tape, cattle prod, Golden Gloves and Flash Bangs that were added in Lonesome Road.

All shotguns chambered for the 12 Gauge shell can also cause Fatigue damage if loaded with 12 Gauge Bean Bag ammunition.

Fallout 4[edit | edit source]

On Survival difficulty, fatigue is to Action Points as radiation is to hit points; the more fatigue one accumulates, the few Action Points they have to use for V.A.T.S. or sprinting. The amount of fatigue accumulated mostly depends on how sleep deprived one is, but hunger and thirst also play a smaller role.[1]


  1. Fallout 4 loading screen hints: "In Survival, Fatigue works like radiation, but affects your Action Points (AP) rather than your Hit Points (HP). Fatigue mostly comes from being tired, but both hunger and thirst also affect it. The more Fatigue you've built up, the less AP you'll have for actions like sprinting and VATS."
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