CCTV Hard Disk Storage Calculator
Enter your number of cameras, their resolution and codec, and how many hours a day they record. The calculator estimates the bitrate, the storage used per day, and the hard-disk size needed for the number of days you want to keep.
Estimate
- Bitrate per camera
- 3.3 Mbps
- Storage per day (all cameras)
- 285 GB
- Storage for 30 days
- 8.55 TB
- Suggested hard disk
- 10 TB surveillance HDD
Estimates use typical bitrates. Real usage varies with scene activity, frame rate and camera settings, so allow about 10–20% headroom.
How the calculation works
How is CCTV storage calculated?
Storage per day = bitrate (Mbps) × 3,600 seconds × recording hours ÷ 8, which gives megabytes. Multiply by the number of cameras and the days you want to keep. Round up to the next standard hard-disk size.
How much does H.265 save compared with H.264?
H.265 typically uses about 40–50% less bandwidth and storage than H.264 at similar quality. Smart codecs such as H.265+ save more on scenes with little movement.
Does motion recording save space?
Yes. Recording only on motion can cut storage by half or more for quiet areas. Continuous recording is safer for entrances and cash counters.
Get a free quote
Tell us a few lines about your business and what you need. We reply the same working day with questions or a fixed written quote.
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