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Calcimator

Smoke Detector Spacing Calculator

Calculate smoke detector grid layout and spacing for different ceiling types per NFPA 72.

Inputs

Results

Detectors Needed

2

Adjusted Spacing (ft)

30

Coverage per Detector (sq ft)900
Detectors Along Length2
Detectors Along Width1
Room Area (sq ft)1,200
Max Wall Offset (ft)15
How to Use This Calculator
  1. Enter Room Length (ft), Room Width (ft), and Ceiling Height (ft).
  2. Set Ceiling Type.
  3. Review Detectors Needed and Adjusted Spacing (ft).
  4. Use Coverage per Detector (sq ft) and Detectors Along Length to inform your decision.
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