This is a good water volume calculator for accommodating for live rock, live sand, sump, fuge, plumbing etc. I looked at the few calculators posted above, but none was as comprehensive.
Yes, inevo, I should of posted that long ago. Jose is one of my best friends, I'll be rooming with him at MACNA. We do have a link to Joes's cal on the first post but they are indirect. Here are the other ones