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PoE calculator
Budget switch power against device draw, accounting for cable loss between PSE and PD. Runs entirely in your browser — no project or account is required.
Switch
PoE budget (W)From the switch datasheet — PSE watts.
Cable run (m)Worst-case loss at 100m is ~16%, which is where the standards' PSE/PD gap comes from.
Devices
Ports42
Device draw612.0WAt the PD
Switch load700.1WAt the PSE, incl. cable loss
Headroom39.9W95% used
- Above 85% of budget — leaves no room for a device swap or a redundant supply failing over.
Breakdown
| Device | Count | PD watts | PSE watts | Standard |
|---|---|---|---|---|
| Wi-Fi 6 APs | 12 | 306.0 | 350.1 | 802.3at (PoE+, Type 2) |
| IP phones | 24 | 156.0 | 178.5 | 802.3af (PoE, Type 1) |
| PTZ cameras | 6 | 150.0 | 171.6 | 802.3at (PoE+, Type 2) |