← Enterprise IT Network Studio
🔌

PoE Power Budget

802.3af/at/bt · Switch PSU Requirement · Total PoE Watts

When to use: Use to calculate the total PoE power budget for switch selection and PSU sizing. Enter device groups with their count and PoE standard. The calculator determines typical and maximum watts, then sizes the required switch PSU accounting for power supply efficiency. Critical for IP camera, Wi-Fi AP, VoIP, and access control system designs.

Device Groups
units
units
units
units
%
Required PSU Size
1440
Watts (standard PSU)
Power Budget Summary
Total Devices68
Typical PoE Draw946 W
Max PoE (worst case)1193 W
PSU Required (with eff.)1404 W
Selected PSU Size1440 W
PoE Standards
802.3af – PoE (Class 0–3)15.4W max
802.3at – PoE+ (Class 4)30W max
802.3bt – PoE++ Type 3 (60W)60W max
802.3bt – PoE++ Type 4 (90W)90W max