CCTV Storage Calculator
CCTV Storage CalculatorCalculate HDD size from cameras, resolution, retention. Fast, free and secure — works in your browser. By AK Computer, Dwarka.
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How to use
- 1 Enter the number of cameras and their resolution.
- 2 Set the bitrate or frame rate and codec (H.264 or H.265).
- 3 Enter the retention period in days and recording hours per day.
- 4 Read the estimated total HDD size and pick the next standard drive.
Frequently Asked Questions
How much hard disk do I need for a CCTV system?
It depends on camera count, resolution, bitrate, hours recorded per day, and retention days. Enter those values and the calculator estimates the total HDD size; always round up to the next standard drive.
Does H.265 reduce CCTV storage compared to H.264?
Yes, H.265 (HEVC) roughly halves the storage of H.264 at the same quality, so choosing it can nearly double your retention on the same disk.
Are CCTV storage results exact?
No, they are estimates. Real usage varies with scene motion and bitrate mode, so add roughly 10 to 20 percent headroom when buying the drive.