New Kid

Weapons spread determines the accuracy of a ranged weapon in degrees. Formulas here were taken from the GECK wiki.

Spread computationEdit

$ \begin{align}\text{total spread} = max\left(\text{aim spread},\text{weapon spread}\right)\end{align} $

The total spread is equal to the sum of the spread due to the character aiming and the spread due to the weapon itself.

Aim SpreadEdit

$ \begin{align}\text{aim spread} = \text{perk effects}\left(\text{state effects} * \text{mobility effects} * \text{skill/weapon condition effects} + \text{limb condition effect}\right)\end{align} $

State EffectsEdit

State effects combine multiplicatively.

  • Crouching reduces spread by 40%. (multiplier: 0.6)
  • Using iron sights reduces spread by 65%. (multiplier: 0.35)
  • Accordingly, doing both reduces spread by 79%. (multiplier: 0.21)

Mobility EffectsEdit

Mobility effects are additive, but under the game's default settings, they always sum to 1, and hence simplify out to being ignored; if the appropriate game settings are tweaked, they can be used to apply different penalties across walking, running and remaining still.

Skill/Weapon Condition EffectsEdit

These combine additively, but by default, Weapon Condition is always 0, so only the Skill Effect matters; if the appropriate game settings are tweaked, weapon condition (from 0 to 100%) times a constant will combine additively with skill.

The appropriate skill (Guns, Energy Weapons or Explosives) reduces spread by 0.5% (from 50% up to 100%) per skill point. (multiplier: from 0.5 to 0)

Limb Condition EffectEdit

Damage to limbs increases (pre-perk) spread.

  • ArmPenalty is 0 with no crippled arms, 0.5 when the right arm is crippled with a one handed weapon, 0.25 with one arm crippled with two-handed weapon, 0.5 when both arms are crippled with two-handed weapons.

Weapon spreadEdit

Weapon spread is equal to the Min Spread stat of the weapon in degrees. The weapon condition has no effect on weapon spread.


Gametitle-FNV Prior to patch, ammunition that had a spread modification effect (like the 12 gauge shotgun shell) applied it to the aim spread instead of the weapon spread.


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