[CoC] How are Challenge Ratings figured?

[Geoffrey]

I'm interested in converting some of the monsters in Chaosium's The Creature Companion to d20 CoC. How would I determine the Challenge Rating for the converted creatures?

NOTE: I'm not familiar with other d20 games (including 3rd edition D&D), so even if the answer seems obvious, please point me in the right direction.

 

[jaerdaph]

The only way to truly get an accurate CR for a monster is through playtesting, but here's a link to the Challenge Rating Guestimator at the Creature Catalog (originally from DRAGON Magazine #276):

http://www.enworld.org/cc/fiend_factory/cr_calculator.php

Note: Round fractions down.

Also, here's a link to the PDF of the "How To Create A Monster" DRAGON #276 article by Skip Williams, where the CR Guestimator originally appeared:

http://www.enworld.org/cc/downloads/files/monster_article.pdf

 

[Geoffrey]

Thanks! That will help me out a lot.