A CCTV disk calculator helps estimate how much storage you need for surveillance recording before buying hard drives or sizing an NVR.

Instead of guessing, you can plan based on practical inputs like number of cameras, bitrate, recording schedule, and retention period.

Why a CCTV Disk Calculator Is Useful

A dedicated calculator is useful when you need predictable video retention:

• estimating total HDD/TB requirement before deployment
• comparing 24/7 recording vs motion-only recording
• planning retention targets (for example 15, 30, or 90 days)
• avoiding under-sized storage that overwrites footage too early

It helps both installers and operators plan capacity with fewer surprises.

Practical Workflow

Use this sequence when planning CCTV storage:

1. Enter camera count and per-camera bitrate.
2. Set daily recording duration (24h or scheduled hours).
3. Set required retention days.
4. Review total storage and select practical drive capacity.

Then add a safety margin for real-world fluctuations.

Notes for Accuracy

• Use realistic bitrate values based on codec and resolution.
• Include overhead for metadata and filesystem usage.
• Keep extra buffer for incident spikes and export operations.
• Recalculate when adding cameras or changing retention policy.

Final Take

A CCTV disk calculator is one of the easiest ways to prevent storage planning mistakes. Accurate sizing protects retention goals, reduces operational risk, and avoids emergency upgrades later.

Tool: https://sanishvasudevan.com/software/disk-calculator