Level

"The general competency of the player character. A measure of your experience and abilities."

- In-game description

Levels are the general competency of the player character in the SPECIAL character system. A measure of experience and abilities. The level is determined by the amount of Experience Points the player character has earned throughout their journey.

Level up
Fallout, Fallout 2, and Fallout Tactics Level Up

Fallout 3 Level Up

Fallout New Vegas Level Up Each time one levels up, they have the option to modify skills but not primary statistics. They can also gain special perks. Therefore, the player character becomes stronger and better with each level gained.

Level cap
The maximum level reachable varies from game to game:
 * Fallout: 21
 * Fallout 2, Fallout Tactics, and Fallout: Brotherhood of Steel: 99
 * Fallout 3: 20 (30 with the Broken Steel add-on)
 * Fallout: New Vegas: 30-50; each of the four add-ons raises the level cap by 5 levels
 * Fallout 4 does not have a level cap, although after the level 65535 the game crashes.

Bugs

 * There may be a glitch that will not let you keep your perks after level 30.
 * Levels 20-29 will all register as Last, Best Hope of Humanity for a good Karma Player, in the Pip-Boy Stats screen.

Fallout: New Vegas
* Your character must also not have the Logan's Loophole trait, as this caps your level at 30.

Fallout 4
When the Sole Survivor levels up, they can choose to either increase one of the seven SPECIAL stats or rank up one of the seventy perks available. Fallout 4 doesn't have an actual level cap, but the hard limit is 65,535. Trying to level past this point by any means results in the executable crashing.

The number of points to earn in level n in order to progress to the next are:
 * $$\Delta\mathrm{XP}_n=75\cdot(n-1)+200\,.$$

Simplified:
 * $$\Delta\mathrm{XP}_n=75n+125\,.$$

The XP thresholds for level n are thus:
 * $$XP_n=37.5\cdot n^2+87.5\cdot n-124\,.$$