Well, this is awkward. A few days ago I started working on a stat calculator as well (after remembering that this game came out), only to find that a few others had already started putting one together.
Mine can currently do a bit more than the one on this page (dynamically distinguish between Priest and Priestess, account for inherited class redundancies, etc.), so I figured it would be worth posting here as well.
https://docs.google.com/uc?authuser=0&id=0B-eDQzy_a2QKYTN6dnUwZEZ6TGs&export=download
I can also fill in some of the formula gaps in the one that's already here, if you all would rather use that one.
EDIT:
There was a bug where the calculator would grant parallel classes to units more liberally than it should have. I fixed this in the offline version and the link has been updated, but google sheets can't read my updated formula, so the online version is currently inaccurate.
I'll make a new post when I fix the online version, but the link is still here if you can't use the better version.
https://docs.google.com/spreadsheets/d/1YQ1xzhTY3n8W9-czLxXlee5oipdGJipnDgV0VDtgIok/edit?usp=sharing