CCTV Storage Calculator Guide for 30-Day Retention

Plan 30-day CCTV retention with the storage formula, bitrate assumptions, codec tradeoffs, RAID headroom, and quote-ready sizing checks.

AI Overview

CCTV storage is controlled by bitrate, recording hours, retention days, camera count, and overhead. Resolution alone is not enough to size a reliable 30-day NVR or VMS system.

A CCTV storage calculator is useful only when the inputs match real camera bitrate and retention policy. The 30-day number must include codec, recording mode, night noise, RAID, and expansion headroom.

FortSense projects commonly start in the qualified perimeter security range. Use this page to decide whether the site is ready for a design review instead of treating the article as a commodity parts list. For immediate evaluation, route the site details to FortSense 4 or contact FortSense.

Fast answer

The working formula is storage in TB = cameras x bitrate in Mbps x recording seconds x retention days / 8 / 1,000,000. For procurement, add practical headroom before requesting disks, NVRs, or VMS storage.

Selection checklist

  • Use actual camera bitrate instead of only 4K, 5MP, or 1080p labels.

  • Separate continuous recording from event recording.

  • Add RAID, formatting, metadata, and future-camera reserve.

  • Validate the result in the live storage calculator before asking for a design quote.

Common design mistake

The common mistake is quoting a 30-day system from daytime bitrate. Night noise, rain, motion, and MJPEG/H.264/H.265 settings can change the real storage requirement materially.

Internal next steps

Continue with the CCTV storage calculator, compare related terms in the FortSense glossary, and request a scoped review when the perimeter, camera, and monitoring assumptions are known.

Turn this into a FortSense design review

If the perimeter security project is in the qualified perimeter security range, FortSense can map zones, camera verification, and alarm outputs before procurement.

Request a design review

FAQ

Frequently Asked Questions

Multiply camera count by average bitrate, recording seconds per day, and 30 days, then divide by 8 and by 1,000,000 to estimate TB before overhead.

No. H.265 often helps, but scene complexity, encoder quality, frame rate, and VMS compatibility determine the real saving.

When the system protects a commercial perimeter, needs 30-90 day retention, includes many cameras, or requires verified alarms tied to FortSense zones.

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