Fire Alarm Coverage Calculator
Calculate detector count and spacing per NFPA 72 for smoke and heat detectors.
Inputs
Results
Detectors Required
3
Adjusted Spacing (ft)
30
Coverage per Detector (sq ft)900
Height Adjustment Factor1
Estimated Total Cost$360.00
Cost per Sq Ft$0.18
Base Spacing30
How to Use This Calculator
- Enter Room Area (sq ft), Ceiling Height (ft), and Ceiling Type.
- Set Detector Type.
- Review Detectors Required and Adjusted Spacing (ft).
- Use Coverage per Detector (sq ft) and Height Adjustment Factor to inform your decision.
How the result changes with Room Area (sq ft)
| Room Area (sq ft) | Detectors Required | Adjusted Spacing (ft) |
|---|---|---|
| 10,045 | 12 | 30 |
| 35,033 | 39 | 30 |
| 65,018 | 73 | 30 |
| 90,005 | 101 | 30 |
What each input means
- Room Area (sq ft)
- Total floor area requiring detector coverage.
- Ceiling Height (ft)
- Height from floor to ceiling.
- Ceiling Type
- 1=Flat/Smooth, 2=Beamed, 3=Sloped.
- Detector Type
- 1=Smoke Detector, 2=Heat Detector.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersRoom Area (sq ft) = 2000, Ceiling Height (ft) = 10, Ceiling Type = 1, Detector Type = 1 = 4 input(s) provided
- Calculate Detectors RequiredDetectors Required3 = 3
- Calculate Adjusted SpacingAdjusted Spacing30 = 30
- Calculate Coverage per DetectorCoverage per Detector900 = 900
- Calculate Height Adjustment FactorHeight Adjustment Factor1 = 1
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