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Free tools · NFPA 72

Free Fire Alarm Calculators

The calculations every fire alarm designer and technician runs, built for US systems by Joseph Montuori, NICET Level IV. No sign-up, no email, just the math and how it works.

Standby battery calculator24 hours standby plus 5 or 15 minutes alarm, with the 20% or 25% NFPA 72 safety margin by edition.NAC voltage drop calculatorEnd-of-line voltage from NEC Table 8 wire resistance, starting at 20.4 V, plus the longest run your wire can carry.Smoke and heat detector spacingDetector count for a room with a 0.7 rule check, heat detector height reduction, joists and beams.

These calculators are planning aids and do not replace a full design review, the manufacturer's calculations, or the requirements of your authority having jurisdiction. Need the whole design? Titan prepares NICET Level IV fire alarm drawings nationwide.

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