PoE Power Budget Calculator
PoE Power Budget CalculatorSwitch watts vs camera watts, headroom %. Fast, free and secure — works in your browser. By AK Computer, Dwarka.
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How to use
- 1 Enter your switch total PoE power budget in watts.
- 2 Enter the number of cameras and watts per camera.
- 3 Include any heaters or PTZ motors that draw extra power.
- 4 Read the total draw and the remaining headroom percentage.
Frequently Asked Questions
How do I calculate the PoE power budget for a switch?
Add the wattage of every powered device and compare it to the switch total PoE budget. The calculator shows the used watts and remaining headroom.
How much PoE headroom should I leave on a switch?
Leave roughly 20 percent headroom so the switch is not maxed out; PTZ cameras and heaters draw peak power that can exceed their idle rating.
What is the difference between PoE, PoE+, and PoE++?
PoE (802.3af) supplies up to about 15.4W, PoE+ (802.3at) up to about 30W, and PoE++ (802.3bt) up to about 60 to 90W per port for high-draw cameras.