Power Over Ethernet (PoE) Calculator

This calculator allows you to calculate the voltage drop and required power supply for Power over Ethernet hardware.

Just enter your information in the five "Device Information" boxes and click on "Compute". I've filled in the input boxes with generic information to save a second or two for testing. It does some basic sanity checking.

Important Note! The two most important inputs for power over anything are wire gauge and amps used. Wire gauge is easy to figure out (it's either 22 or 24 for common Ethernet cable) but actual input amps is much trickier. You see, most devices list their maximum current draw, not their "normal" draw. So if your access point says "6V at 1.5A" and is 100 feet away on 22 gauge wire, you would be tempted to use a 7.2V supply. But the AP probably only really pulls in half an amp or less under normal conditions, so you should be feeding it just 6.4V.