While I was doing some research for different customers I needed to calculate the power consumption and how many racks I need. So I collected the links to different calculation models from various vendors.

The tools I found were the following:
Dell Data Center Capacity Planner (online)

HP Site Preparation tool

IBM BladeCenter and System x Power Configurator

If you know tools that do the same, but for another server vendor, please let us know. That way we can keep this list up to date.