Fire Alarm Calculators
Tap a button to open a calculator. Only one opens at a time to keep the page clean.
Ground Fault Diagnostic
Simulate expected meter readings for a ground fault, or diagnose fault side and approximate leakage from real measurements.
Resistor Selector
Find the nearest standard value, or compute R from voltage/current or LED parameters.
Battery Sizing (Standby + Alarm)
Estimate amp-hours for a 24V panel.
Voltage Drop
Two-wire loop: round-trip length, Ω/1000ft per gauge.
Wire Gauge Selector
Suggest minimum AWG to meet a % drop target.
NAC Load Planner
Sum device currents and compare to a circuit capacity.
| Description | Per-device (mA) | Qty |
|---|
Speaker / Amplifier Load
Sum speaker taps and compare to amplifier capacity.
| Location / note | Tap (W) | Qty |
|---|
Compressor Wire Size Selector
Select minimum Cu AWG to satisfy ampacity and voltage-drop limits.
DIP Switch Address Helper
Build or decode DIP positions as a binary value.
Occupant Load NFPA 101–style
Pick a use group & subtype to auto-fill a factor from your local JSON library, or enter a factor directly.
/resources/calculators/occupant-load-factors.json. Mixed uses: calculate separately then sum.
Optional: Egress capacity check
Enter capacity factors used by your jurisdiction (stairs vs. level components).
Conduit Fill Calculator
Pick raceway type, trade size, and wire size to see max wire count and whether your requested quantity fits.
Auto uses 53% for 1 conductor, 31% for 2 conductors, and 40% for more than 2 conductors.