Fire Alarm Initiating Device Calculator

Smoke detector, heat detector, and pull station count from floor plan per NFPA 72.

Floor area per floor (sq ft)

Ceiling height (ft)

Number of floors

Exits per floor

Detector config (1-3)

Corridor length (ft)

Tab to move between fields

Total initiating devices

Smoke detectors20

Heat detectors0

Manual pull stations4

Horn/strobe devices6

SLC circuits needed1

Devices per floor12

Adj. smoke spacing (ft)30

How to Use This Calculator

Enter the floor area per floor in square feet and the ceiling height in feet.
Enter the number of floors and exit doors per floor — pull stations are required at each exit.
Select the detector configuration: smoke only (1), smoke plus heat (2), or heat only (3).
Enter total corridor length in feet for corridor-specific smoke detector placement.
Read the total initiating device count, smoke detector and heat detector totals, pull stations, horn/strobe devices, and SLC circuit requirements.

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