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 — the rest are solved instantly.
Battery Sizing Calculator
Calculate required battery AH capacity for fire alarm systems. NFPA 72 standby and alarm duration support.
Amp Draw Calculator
Add devices to calculate total standby and alarm current draw. Feed results into battery sizing.
Voltage Drop Calculator
Calculate voltage at each device on a NAC or speaker circuit. Pass/fail indicators per manufacturer specs.
Resistor Color Code Calculator
Interactive resistor color band calculator with fire alarm EOL presets. Read bands or reverse-lookup by value.
DIP Switch Calculator
Visual DIP switch bank with binary/decimal/hex conversion and fire alarm panel presets.
Conduit Fill Calculator
Visual conduit cross-section with NEC fill thresholds and fire alarm wire types.
Wire Gauge & Ampacity Reference
Interactive AWG ampacity table with correction factors and fire alarm wire applications.
Decibel Distance Calculator
Calculate sound level at distance for fire alarm speaker and horn coverage planning.