PoE power budget

PoE Power-Budget Calculator

A switch has ports and a total watt budget — run out of watts and cameras drop off. Enter how many PoE devices you're powering, the draw per device and the switch's PoE budget, add a cable-loss allowance, and see the total load, the headroom left, the utilisation and a clear pass/fail. Planning figures; real draw varies. Runs in your browser.

PoE devices / camerasPower per device (W)a fixed camera ~4–8 W; PTZ / IR / heaters draw more — check the datasheet

Switch PoE budget (W)on the switch spec, often less than ports × max

Cable-loss allowance

0.0 W

Total PoE load (with cable loss)

Within budget

the switch has enough PoE watts for this load

0.0 W

Headroom

0 %

Utilisation

This switch can power up to about

0 such devices

Tip: keep ~20% headroom, and check the per-port max power supports your highest-draw device — PTZ, IR and heaters need 802.3at / bt, not plain 802.3af.

Planning estimate only — real draw varies with IR, heaters and PTZ motion, and long cable runs lose more. Size with the product datasheet and confirm with a bench test before you commit to a switch.

Plan the power and cabling

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