There was a conversation on converting
Dark Heresy to
Inquisitor on the old version of The Conclave, but that must have been before the site was killed by hereteks as I can't find it anymore. I think the conclusion reached was that there isn't really a simple formula for converting between the two game systems. The two games tend to be used to represent characters at different points in their careers, with
Inquisitor generally representing more experienced characters. And unlike
DH, characters in
Inquisitor don't start at the bottom and work their way up - there isn't really an experience/advance system in
Inquisitor, and so a 'starting' character can already be a master swordsman, Inquisitor Lord or AdMech Magos.
So, probably the best approach would be to look at what level the stats represent in the two systems and work out what stats are appropriate for your character. A fair starting point for working out
Inquisitor stats would be either my article
here (which is based on and extrapolated from the rulebook), and the various posts in
this thread on the 'Clave.
If there's anything else I can help with on the
Inquisitor side, just ask.
- Dave