PCs, NPCs, and CR

[darth_borehd]

While this seems to be true, I can't find a rule the explicitly states this.

PCs with normal races have a CR equal to class level - 1.

NPCs with NPC classes have a CR equal to NPC class level - 2.

Commoner levels seem to be at CR equal to Commoner level - 3

Is this true, and if so, anybody know if this rule is stated somewhere?

[concerro]

It is in the gamemastering section:

prd wrote:

Adding NPCs: Creatures whose Hit Dice are solely a factor of their class levels and not a feature of their race, such as all of the PC races detailed in Races, are factored into combats a little differently than normal monsters or monsters with class levels. A creature that possesses class levels, but does not have any racial Hit Dice, is factored in as a creature with a CR equal to its class levels –1. A creature that only possesses non-player class levels (such as a warrior or adept) is factored in as a creature with a CR equal to its class levels –2. If this reduction would reduce a creature's CR to below 1, its CR drops one step on the following progression for each step below 1 this reduction would make: 1/2, 1/3, 1/4, 1/6, 1/8.

[darth_borehd]

Thank you!

[HappyDaze]

Also kep in mind that granting an NPC the equivalent gear of a PC increases the CR by 1.