FREE · NETWORK & IT INFRASTRUCTURE
PoE Budget Calculator.
Check a switch’s PoE budget against cameras, access points and phones by IEEE class, port standard (802.3af/at/bt) and actual draw.
Some devices are not compatible with the port standard or exceed their class.
- Remaining budget
- 13.6 W
- Power at the devices
- 204 W
- Ports used
- 23 / 24
- Heat from devices and cable loss
- 1,216 BTU/h
Devices
| Device | Qty | Class | Reserved at switch | Notes |
|---|---|---|---|---|
| Wi-Fi 6 access point | 4 | 4 | 120 W | OK |
| IP phone | 12 | 2 | 84 W | OK |
| Fixed IP camera | 6 | 3 | 92.4 W | OK |
| PTZ camera | 1 | 6 | 60 W | needs class 6; 802.3at ports give up to class 4 |
- Class reservations are the IEEE power at the switch port (15.4, 30, 60 or 90 W…), which includes the worst-case loss in 100 m of cable.
- Many switches also limit power per port group or need a second power supply for the full PoE budget; check the switch datasheet.
How to use PoE Budget Calculator
Enter the switch PoE budget, ports and port standard, choose class or actual-draw allocation, then add devices (profiles fill typical class and draw).
How it works
Class allocation reserves the IEEE power at the switch port for each class (15.4, 30, 60, 90 W…). Actual-draw mode scales the device draw by the class’s worst-case cable loss.
Example
4 Wi-Fi 6 APs, 12 phones, 6 cameras and a PTZ reserve 356 W of a 370 W budget; the class 6 PTZ is flagged on 802.3at ports.
Questions about PoE Budget Calculator
Is PoE Budget Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Device profiles are typical values; use the datasheet class. Per-port-group limits and redundant power supplies are not modelled. Everything is calculated in your browser; nothing is sent or probed on the network. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.