Getting the scroll extents of a ScrollView for centering?

I need to auto-center a scroll view, but it seems I cannot get access to the actual calculated max scroll value.

Obviously that would be for allowing for the end buttons and the width/height of the scroll bar on the opposite axis, but those values don't account for the values I am seeing, and I figure there is some other calcs going on behind the scenes (probably to deal with the scroll thumb expansion?).

My question is, how can I get the final calculated extents of the scroll pos vector so I can center my view properly?

Thanks,
-Jeremy