Mod:DUST Survival Simulator/Level

Level Cap
Fallout New Vegas defaults to a level cap of 30. Of the five available DLCs, four raise the level cap by 5 to a total of 50 levels: Dead Money, Honest Hearts, Old World Blues and Lonesome Road. Gun Runners Arsenal does not raise the level cap.

Since DUST does not change the level cap, and after v.165 requires all five DLCs to be installed, DUSTs level cap is 50.

XP
DUST, lacking quests and their associated XP gains, doubles the vanilla XP bonus of some XP relevant actions, namely discovering map markers (20XP) and terminal hacking and picking locks (up to 120XP).

XP rewards for killing creatures and other NPCs are untouched. Also, XP for a kill still is only rewarded, if the player dealt at least 40% of the total damage to an opponent killed by NPCs or other means.

Leveling Up
DUST raises the number of XP required for leveling up considerably by doubling the amount compared to vanilla New Vegas. Vanilla reaches level 50 at 186200 XP, DUST at 372400 XP.

This is in part mitigated by the fact, that DUST allows picking a Regular perk at every level gained, instead of only every other level like in vanilla.

As per Bethesdas G.E.C.K. wiki, the generic formula for calculating the required XP for a specific level is:

XP = (Level - 1) * ((Level - 2) / 2 * iXPBase + iXPBumpBase)

Vanilla uses iXPBase 150 and iXPBumpBase 200, DUST sets iXPBase to 300 and iXPBumpBase to 400.