int/wis to mana calculations

[Shaun421]

I use that formula in a spread sheet I made for my Druid so I can compare what will happen if I update certain equipment and so far <200 formula is pretty close (not anywhere near getting >200 wis), but my spreadsheet never quite seems to match what it is showing me on the p99 server. Always seems to be a discrepency of +/- 30 mana or so. I haven't been able to figure out what might be causing it, but its been close enough for my purposes.