Radiation Resistance

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For the perk, see Rad Resistance.

The amount of radiation you are exposed to is reduced by this percentage. Radiation Resistance can be modified by the type of armor worn, and anti-radiation chems.

— Fallout In-game description

Radiation Resistance is a derived statistic in Fallout, Fallout 2, Fallout 3, Fallout Tactics and Fallout: New Vegas.

It reduces radiation damage by a percentage.

Rad-X temporarily increases Radiation Resistance.

Fallout, Fallout 2, Fallout Tactics, Fallout: New Vegas

\text{Initial level}=\text{Endurance}\times2


  • Average characters will have a 10% radiation resistance.
  • The Fast Metabolism trait sets initial radiation resistance to 0.
  • The Rad Resistance perk increases radiation resistance by 15% per rank. (10% per rank in FO1)
  • The Vault City Inoculations perk increases radiation resistance by 10%.
  • Rad-X temporarily increases radiation resistance by 50%. Half of it is lost after 24 hours, with resistance returning to its original value after another 24 hours.
  • In Fallout, Radiation Resistance can go as high as 100% (Which is needed to survive The Glow). In Fallout 2, it is capped at 95%, in Fallout: New Vegas, however it is capped at 85%.

Fallout 3

\text{Initial level }%=(\text{Endurance}-1)\times2

Example: A starting Endurance of 5.


Permanently increasing Radiation Resistance

Temporarily increasing Radiation Resistance


  • In Fallout 3, Radiation Resistance is capped at 85%.


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