Fire Alarm Tools & Calculators
Free interactive tools built for fire alarm technicians. All calculations run right in your browser — giving you instant results with no sign-up required.
Available Tools
Ohm's Law Calculator
Calculate voltage, current, resistance, and power. Enter any two values and solve the rest instantly.
Battery Sizing Calculator
Calculate required battery Ah capacity for fire alarm systems, with standby and alarm presets for NFPA 72, BS 5839-1, AS 1670.1, NZS 4512, and Canadian codes.
Amp Draw Calculator
Add devices to calculate total standby and alarm current draw, then feed results into battery sizing.
Voltage Drop Calculator
Calculate voltage at each device on a NAC or speaker circuit with pass/fail indicators, in feet or meters.
Resistor Color Code Calculator
Read resistor color bands or reverse-lookup by value with fire alarm EOL presets.
DIP Switch Calculator
Use a visual DIP switch bank with binary, decimal, hex conversion, and fire alarm panel presets.
Conduit Fill Calculator
Calculate conduit fill percentage with US NEC thresholds, US conduit sizes, and common fire alarm wire types.
Wire Gauge & Ampacity Reference
Reference AWG ampacity, correction factors, and common fire alarm wire applications.
Decibel Distance Calculator
Calculate sound level at distance for fire alarm speaker and horn coverage planning, in feet or meters.