Fire Alarm Loop Load Calculator
Check device count, loop current, capacity usage, address usage, and spare margin.
Open ToolFire Alarm Battery Backup Calculator
A fire alarm battery calculator for standby current, alarm current, required backup duration, derating, and spare capacity.
Inputs
Forms are empty on load. Use sample data to preview the workflow or enter your own project values.
Learn more
Formula logic, use cases, assumptions, and limits for this tool.
How this tool helps
Use this to check whether a fire alarm panel battery set has enough standby and alarm capacity. Verify final requirements with project code and panel manufacturer data.
Assumptions and limits
This tool provides a planning-level result. It does not replace detailed engineering design, approved software, manufacturer data, authority requirements, or project specifications.
Typical use cases
- Early estimation and tender support.
- BOQ sanity checking and technical review.
- Site discussion before final engineering verification.
- Comparison of alternatives using consistent assumptions.
Result interpretation
Read the recommendation, warning, and confidence sections together. A result without warnings is still not an approval; it only means the entered values did not trigger built-in planning alerts.
Related tools
Other tools in Fire Alarm.
Fire Alarm DIP Switch Calculator
Convert fire alarm device addresses into DIP switch ON/OFF positions and binary value checks.
Open ToolCalculation methodology
Battery Ah = standby current x standby hours + alarm current x alarm duration, adjusted for derating and spare capacity.
Inputs are treated as planning assumptions. The calculator shows warnings when entered values fall outside practical thresholds or selected standard-profile limits.
Version history
- v1.3.6-prelaunch: Added methodology, standard profile support, version notes, and direct PDF report download.
- v1.3.5: Calculator page added with sample data, warnings, and print-ready report layout.
Stage 2 roadmap: optional saved projects, dashboards, and shared calculation history without forcing login for free use.
Trust and verification
Every result includes assumptions, warning logic, and a downloadable report. Final engineering decisions still need qualified review, local authority approval, manufacturer data, and project specifications.
Worked example
Use the sample data button to load a realistic scenario, then download the PDF report to review inputs, results, methodology, warnings, and disclaimers in one place.