PoE Power & Extender Calculator

Check whether your PoE run — including extenders — will deliver enough power.

Sufficient power

Margin: +10 W

PoE standard at sourcePSE output power (W)Default for the selected standard — edit if your switch/injector differs.Number of extenders in the chain

10–4

Segment 1: Switch → Extender 1 (m)Segment 2: Extender 1 → Device (m)

Cable loss (W per 100 m)Estimate — confirm against your cable and current draw.Extender overhead (W each)Check your extender's datasheet.Extender max output (W)Check your extender's datasheet.Device power draw (W)Number of devices at the end

Power required

12W

12 W × 1 device

Power delivered

22W

at the device end of the run

Segment-by-segment breakdown

Segment	Length	Cable loss	After cable	After extender
Segment 1: Switch → Extender 1	100 m	−3 W	27 W	25 W−2 W overhead
Segment 2: Extender 1 → Device	100 m	−3 W	22 W	—
Power delivered at device			22 W

Segment 1: Switch → Extender 1

Length100 m

Cable loss−3 W

After cable27 W

After extender25 W−2 W

Segment 2: Extender 1 → Device

Length100 m

Cable loss−3 W

After cable22 W

After extender—

Power delivered at device22 W