IP Camera CCTV Calculator (formerly CCTVCAD Calculator) — Quick Bandwidth & Storage Estimator

IP Camera CCTV Calculator (formerly CCTVCAD Calculator): Accurate Storage, Bitrate & Retention Planner

Planning a reliable IP camera system requires accurate estimates of bandwidth, storage, and retention. The IP Camera CCTV Calculator (formerly CCTVCAD Calculator) is built to simplify that process: input camera count, resolution, frame rate, bitrate mode, motion ratio, and retention needs — and get precise, actionable estimates for daily bandwidth, required disk space, and recommended recording settings.

Why accurate calculation matters

• Avoid undersizing: Running out of storage or exceeding network capacity causes dropped frames, lost footage, and system instability.
• Avoid overspending: Excessively conservative estimates lead to wasted expenditure on unnecessary storage and infrastructure.
• Optimize settings: Knowing how bitrate, frame rate, and motion affect storage empowers you to tune cameras for the best balance of quality and cost.

Key inputs the calculator uses

• Camera count and model/resolution (e.g., 2MP, 4MP, 4K)
• Frame rate (FPS) — higher FPS increases bitrate and storage linearly.
• Bitrate mode — constant (CBR) vs. variable (VBR). VBR typically yields lower average bitrates but varies with scene complexity.
• Average bitrate (or codec and quality setting) — can be entered directly or derived from codec/resolution presets.
• Compression codec (H.264, H.265/HEVC) — H.265 often reduces storage needs ~30–50% vs H.264 for similar quality.
• Recording schedule — continuous, motion-only, or mixed schedules.
• Motion/activity ratio — percent of time with motion (affects storage for VBR and motion-only recording).
• Retention period — days of video to keep.
• Overhead and redundancy — filesystem overhead, RAID parity, and growth buffer.

What the calculator outputs

• Per-camera and total average bitrate (Mbps) — helps size network segments and switches.
• Daily and monthly storage per camera (GB) — for cost planning and procurement.
• Total storage required for desired retention (TB) — including overhead and RAID.
• Recommended disk size and RAID configuration — guidance for usable capacity after parity.
• Estimated number of recordable days given available storage — reverse-calculation for existing systems.
• Suggested bitrate or FPS adjustments to meet storage or retention targets.

Example calculation (illustrative)

Assume 10 cameras, 4MP, 15 FPS, H.265, average bitrate 1.2 Mbps per camera, continuous recording, 30-day retention.

• Per-camera daily storage ≈ (1.2 Mbps × 86,400 seconds) / 8 / 1,024 ≈ 1.23 GB/day
• Total daily storage ≈ 12.3 GB/day
• 30-day total ≈ 369 GB (add 20% overhead → ~443 GB usable)
• With RAID-6 and parity overhead (approx. 25–30%), choose a 2–3× larger raw capacity accordingly.

(Note: the calculator performs precise conversions and includes configurable overhead and redundancy factors.)

Best practices when using the calculator

• Use measured or vendor-provided average bitrate figures when possible; default presets are a starting point.
• Prefer H.265/HEVC for new installations to reduce storage and bandwidth, while ensuring compatibility with NVR/VMS.
• For busy scenes, increase average bitrate or FPS; for static scenes, reduce them to save storage.
• Factor in RAID and filesystem overhead; always include a growth buffer (10–30%).
• Re-calculate when changing camera count, resolution, or retention policy.

Common use cases

• Designing new