Features & Capabilities

Calculate standby battery requirements instantly. BS EN 50131 and BS 5839-1:2025 compliant. Built for UK fire and security engineers.

StandbyCalc is the fastest way to calculate standby battery requirements for UK fire and intruder alarm systems.

Built for engineers, by engineers. Enter your quiescent and alarm currents, select your system grade or category, and get an instant answer — including which standard battery size you need.

SUPPORTS:

  • Intruder alarms — BS EN 50131 / BS 9263, Grades 1-4
  • Fire alarms — BS 5839-1:2025, Categories L, M, and P
  • Standalone PSUs — custom standby and alarm periods

FREE FEATURES:

  • All battery calculations
  • All standards and grades
  • Save unlimited calculations
  • Standard battery size recommendations

PRO UPGRADE (one-time purchase):

  • iCloud backup across devices
  • PDF reports with full formula working
  • Add your company logo and branding
  • Share reports via email, AirDrop, or Files
  • Professional compliance documentation

Compliant with NSI and SSAIB requirements. Calculations per BS 9263 Annex C and BS 5839-1:2025 Annexe E.

No account required. No subscription. Just open and calculate.

User Growth & Download Statistics

App
By:
D4N LTD
Version:
1.0 Last updated: 2026-04-01
Version code:
883901869
Creation date:
2026-04-01
Compatible devices:
Size:
3.84MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-07-01
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
D4N LTD
Apple Apps Store
https://apps.apple.com/gb/app/standbycalc/id6761339878
Website:
https://d4n.io/projects/standbycalc/

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