Radiation Resistance

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

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. Rad-X temporarily increases Radiation Resistance.

Fallout, Fallout 2, Fallout Tactics
Initial Level: Starting radiation resistance is equal to EN x 2. 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, rad resistance can go as high as 100% (needed to survive the Glow). In Fallout 2, it is capped at 95%.

Fallout 3
The maximum amount of resistance you can gain from perks and Endurance in Fallout 3 is 72% in total. You can increase this up to a maximum of 85% with items or drugs.

Permanently increasing Radiation Resistance

 * The formula for radiation Resistance is (Endurance-1)*2. Each point of Endurance increases your Radiation Resistance by +2%, up to a maximum of +18% at 10 Endurance.
 * The Cyborg perk gives +10% Radiation Resistance.
 * The Rad Resistance perk gives +25% Radiation resistance.
 * The Survival Expert perk gives between +2% and +6% Radiation resistance.
 * The Pitt Fighter perk from The Pitt gives +3% Radiation Resistance.
 * The Booster Shot perk from The Pitt gives +10% Radiation Resistance.

Temporarily increasing Radiation Resistance

 * The rad-X drug gives up to +75% Radiation resistance with the Medicine skill at 100.
 * An advanced radiation suit, the environment suit, Lesko's lab coat, Filtration helmet, a radiation suit and the modified utility jumpsuit will all increase Radiation Resistance while worn.

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