Cisco Power Calculator
My co-worker & network engineering warrior, Peter, pointed this out to me earlier today (must have a valid account on the Cisco web site to access it). Pretty cool.
The Cisco® Power Calculator enables you to calculate the power supply requirements for a specific Power over Ethernet (PoE) configuration. The results will show output current, output power, and system heat dissipation. The Cisco Power Calculator supports the following Cisco product series: Cisco Catalyst® 6500, Catalyst 4500, Catalyst 3750, and Catalyst 3560 series switches, and the Cisco 7600 Series Router.
The calculator is an educational resource and a starting point in planning your power requirements; it does not provide a final power recommendation from Cisco. To determine the power requirements and software most appropriate for your company, we suggest you work with a Cisco representative, Cisco channel partner, or a solutions provider.