Enter your recording setup details to instantly estimate total video storage needed.
How the Video Storage Calculator Works
Select Resolution & Bitrate
Enter Daily Recording Hours
Set Retention Days & Camera Count
Multiply Bitrate × Time × Cameras
Get Total Storage Required
What is a Video Storage Calculator?
A Video Storage Calculator estimates the total storage capacity needed for continuous or scheduled video recording — most commonly used for CCTV surveillance systems, dashcams, baby monitors, and security camera setups. Unlike a one-off video export, these systems record continuously (or on a recurring schedule) over days, weeks, or months, which means even a modest bitrate can accumulate into a massive total storage requirement over time. This calculator does that math for you instantly, factoring in resolution, recording hours per day, retention period, and number of cameras.
Getting this number right before purchasing a security DVR, NVR, or storage drive is essential — under-provisioning storage means your oldest footage gets overwritten sooner than you'd like, while over-provisioning means paying for capacity you'll never use. Whether you're setting up a home security system, planning storage for a commercial CCTV network, or configuring a dashcam's loop recording settings, this calculator gives you the numbers to plan confidently.
The Video Storage Formula
The calculation combines bitrate, time, and camera count:
Storage per Camera = Bitrate (kbps) × Recording Hours per Day × 3600 ÷ 8 ÷ 1,000,000 (GB per day)
Total Storage = Storage per Camera × Days × Number of Cameras
Since bitrate is measured in kilobits per second, the formula converts hours to seconds, multiplies by bitrate to get total kilobits, then divides by 8 to convert to kilobytes and further to gigabytes. Multiplying by the number of days and cameras gives you the full system's total storage requirement.
Typical CCTV/Camera Bitrates by Resolution
| Resolution | Typical Bitrate | Approx. Storage per Day (24hr, 1 camera) |
|---|---|---|
| 4K UHD (2160p) | ~8,000 kbps | ~86 GB |
| 1440p (2K) | ~4,000 kbps | ~43 GB |
| 1080p Full HD | ~2,500 kbps | ~27 GB |
| 720p HD | ~1,200 kbps | ~13 GB |
| 480p SD | ~600 kbps | ~6.5 GB |
Continuous vs Motion-Triggered Recording
One of the biggest factors affecting real-world storage needs is whether your cameras record continuously (24/7) or only when motion is detected. Motion-triggered recording can reduce storage needs by 60-90% compared to continuous recording, since cameras only capture footage during actual activity rather than recording empty, unchanging scenes for hours. Our calculator's "Recording Hours per Day" field lets you model this — for a camera that only records an estimated 4 active hours per day due to motion triggering, simply enter 4 instead of 24.
| Recording Mode | Typical Daily Active Hours | Storage Impact |
|---|---|---|
| Continuous 24/7 | 24 hours | Highest storage need, complete coverage |
| Motion-Triggered (Active Area) | 2 – 6 hours | 60-90% storage reduction |
| Scheduled (Business Hours Only) | 8 – 12 hours | 50-65% storage reduction |
Common Retention Periods
- Home security: Typically 7–30 days is sufficient for most residential needs.
- Small business: 30–60 days is common, balancing storage cost against incident investigation needs.
- Commercial/enterprise: 60–90 days or longer, sometimes required by insurance or regulatory compliance.
- Dashcams: Typically use loop recording, automatically overwriting the oldest footage once storage is full, often retaining just a few days to a couple of weeks.
Choosing the Right Storage Drive
For continuous recording systems, it's important to use drives specifically rated for surveillance workloads (often labeled "surveillance-grade" or "NVR/DVR-rated"), since standard consumer hard drives aren't designed for the constant 24/7 write cycles that CCTV recording demands and may fail prematurely under that workload. Once you know your total storage requirement from this calculator, round up to the next common drive size (1TB, 2TB, 4TB, 8TB, etc.) and consider adding 10-20% extra headroom for unexpected increases in activity or camera additions.
Frequently Asked Questions
How much storage do I need for a 4-camera home security system?
For four 1080p cameras recording continuously with 30-day retention, expect roughly 3.2 TB total (about 27 GB per camera per day × 30 days × 4 cameras), though motion-triggered recording can reduce this substantially.
Does audio recording affect storage needs?
Yes, but typically only modestly — audio bitrate is usually much lower than video bitrate, adding perhaps 5-15% to total storage depending on audio quality settings.
Why do CCTV systems need special surveillance-rated hard drives?
Standard consumer drives aren't built for continuous 24/7 write operations and can fail prematurely under that sustained workload, while surveillance-rated drives are specifically engineered for this use case.
How can I reduce my camera system's storage needs?
Switch to motion-triggered recording instead of continuous, use a more efficient codec (like H.265 instead of H.264), lower the resolution or bitrate slightly, or reduce your retention period if your use case allows it.