Fire AlarmTools & 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 NFPA 72 standby and alarm duration support.
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.
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 NEC thresholds 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.