POWER OVER ETHERNET
PoE power budget calculator
Add the maximum draw of cameras, wireless APs, intercoms and other devices, then check both switch power and ports.
2. Results
Device load—
Recommended budget—
Ports used—
Rating minus load—
Power budget check
Port count check
Minimum PoE type per device
Input rule: Use maximum draw or maximum PoE input from the data sheet, not an observed average. Cable length, temperature and PSE implementation change real margins.
Formula
Device load W = Σ(quantity × maximum W each)
Recommended budget = device load W ÷ (1 − headroom)
Device types are conservatively compared with power available at the powered device (PD). Advertised PSE output is higher because of cable loss.