Storage Calculator
Estimate how much HDD / NVR storage you need for your CCTV system
FAQ
CCTV Storage – Common Questions
How much storage do I need for 4 security cameras?+
For 4 cameras recording at 1080p, 15fps with H.265 compression, you need approximately 80–120GB per day or 1–2TB for 14 days of retention. Use the calculator above to get an exact estimate based on your resolution, FPS, and retention settings.
What is the difference between H.264 and H.265 for CCTV storage?+
H.265 (HEVC) compresses video roughly 50% more efficiently than H.264. A system using H.265 needs approximately half the storage of the same system using H.264 at the same resolution and frame rate. Most modern Hikvision and Hanwha NVRs support H.265+ for maximum compression.
How long can a 4TB NVR record for?+
A 4TB NVR can typically store 14–30 days of footage for an 8-camera system recording at 1080p with H.265 compression and motion detection. The exact duration depends on resolution, frame rate, codec, and whether continuous or motion-triggered recording is used. Use the calculator above for an exact figure.
Does higher resolution mean I need more storage?+
Yes. A 4K (8MP) camera records approximately 4x more data than a 1080p (2MP) camera at the same frame rate and codec. However, using H.265 compression and motion-triggered recording can significantly reduce storage requirements even at 4K resolution.
What frame rate should I use for security cameras?+
15fps is the industry standard for most security applications and provides smooth enough footage for identification purposes while significantly reducing storage compared to 30fps. For high-movement areas like cash registers or entrances, 25–30fps may be preferred for clearer detail.