Security System Calculator

Camera, card reader, and panel count with PoE budget and storage sizing from facility specs.

Building perimeter (ft)

Interior area (sq ft)

Controlled doors

Entry/exit points

Camera resolution (1-3)

Recording retention (days)

Tab to move between fields

Total cameras

Card readers6

Door controllers3

PoE power budget (W)354

24-port PoE+ switches1

Storage needed (TB)26

NVR units1

Perimeter cameras13

Interior cameras4

Cat6 cable boxes5

Access Panels1

How to Use This Calculator

Enter the building exterior perimeter in feet for perimeter camera coverage (one camera per 40 ft).
Enter the total interior floor area in square feet for interior camera coverage (one per 2,500 sq ft).
Enter the number of controlled access doors and main entry/exit points.
Select camera resolution: 2MP (1), 4MP (2), or 8MP/4K (3) — higher resolution increases storage requirements.
Set the video recording retention period in days.
Read total camera count, PoE power budget (watts), PoE switch count, NVR units, storage in TB, card readers, and door controllers.

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