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PoE Budget Planner
Add up powered devices by PoE class or measured draw, account for cable loss over distance, and compare the total against your switch's power budget. Shows headroom, per-port averages, and whether you are about to brown out an access layer.
From the datasheet, not the PSU rating.
- 184.8 W reserved
- 180.0 W reserved
99% allocated. That works today but leaves no room for another device or a failover scenario.
364.8 WClass allocationWhat the switch reserves — plan against this
5.2 WHeadroom99% of a 370 W budget
162.0 WMeasured drawTypical steady state
18PoE ports used
20.3 WAvg per port
370 WSwitch budget
Method & assumptions
- Switches allocate power by class, not by actual draw. A camera pulling 6 W on a Class 4 port still reserves 30 W unless the switch uses LLDP-based allocation.
- Class wattages are the PSE-side figures from 802.3af/at/bt, which already include the standard's cable-loss allowance to 100 m.
- Measured draw is shown as the lower bound — useful for PSU and UPS sizing, not for port planning.
- Aim to stay under about 90% allocated so a replacement device or a failover has somewhere to go.
Plate —Other tools
More on the bench
- 01Switch Config AuditorPaste a running-config, get the findings.
- 02Drive Health ReaderPaste smartctl output, get a straight answer.
- 03Traceroute ReaderPaste a trace, find out whose problem it is.
- 04Subnet CalculatorCIDR in, everything else out.
- 05Camera Storage CalculatorHow many terabytes for how many days.
- 06Transfer Time CalculatorHow long the migration window really needs to be.
Free diagnosticsSame-day dispatchNo outsourcingDone or free
Need it done, not calculatedWe do this work
We do this work
as well as the maths
Anyone hanging cameras or access points off a switch and hoping the budget covers it.