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Monster CR proficiency is about the same with increases at CR 5, 9, 13, 17, 21, etc...
If you try to follow the DMG math,
CR 1 creature is a good even match for 4 1st level PCs - or 1/4 a CR per level.
CR 2 creature, 4 2nd level - or 1/4 a CR per level
....
CR 10 creature, 4 10th level - or 1/4 a CR per level
...
etc.
In my experience, HL seems to add the class levels - 1 to the CR.
For example, you take an Ogre and give it 4 class levels and HL says that it is CR 5 (base 2 + (4 - 1)), which increases the proficiency bonus to +3. A 4th level PC would only have a proficiency bonus of +2. So it actually increases faster than I would expect.
Using the DMG logic, an Ogre with 4 class levels should only gain 1 CR and no proficiency bonus.
ALSO, and this is the big one. According to the DMG (I don't remember the page), when you add class levels to a monster you are supposed to get the same HD for the class level as the base monster, so regardless of class if you have Large creature, each class level is supposed to grant additional HD of 1d10, not the 1d6 of a wizard or the 1d12 of a barbarian, etc.
HL doesn't do any of that correctly.
So best to custom make a creature each time and calculate CR manually.
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