PoE Power Budget Calculator (Watts)
How much power does a PoE switch need per port?
The PSE port must source the device draw plus the resistive cable loss, so per-port PSE power equals PD watts plus I²R loss in the channel. IEEE 802.3af allows up to 15.4 W per port, 802.3at up to 30 W, and 802.3bt Type 3 and Type 4 up to 60 W and 90 W. The tool also confirms the device draw stays within each standard's PD class maximum.
Run the numbers for your project
Use the PoE Power Budget Calculator (Watts) to get an exact answer for your inputs.
Open the calculatorRelated questions
Pro launch updates
Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.