Upper_Krust
Legend
Hello again mate! 
Actually, at worst I would say there are four categories.
Acknowledging a difference of less than 10% is insanely pedantic and technically futile.
Again, even if the above were more accurate, the differences are firstly negligable and secondly 'best guesses' anyway. So really your just inflicting some calculator confusion unnecessarily.

Anubis said:All I know, really, is that there needs to be five categories, because there are five "levels of power" within the categories of creatures.
Actually, at worst I would say there are four categories.
Acknowledging a difference of less than 10% is insanely pedantic and technically futile.
Anubis said:The 1/5 one does seem a bit low, at least sometimes, but this all must be balanced out with the special abilities.
Perhaps this:
3/4 (75%)
3/5 (60%)
3/6 (50%)
3/7 (42%)
3/8 (37%)
Divide HD by the number on right, then multiply the result by the number on the left. That sound better?
Again, even if the above were more accurate, the differences are firstly negligable and secondly 'best guesses' anyway. So really your just inflicting some calculator confusion unnecessarily.