How much storage do I need for a CCTV camera?

The storage required depends on the number of cameras, resolution, frame rate, and days of retention. A general rule is that one 1080p camera recording continuously at 15 FPS on H.265 compression uses roughly 300 to 400 GB per month.

Does H.265 save storage space?

Yes. H.265 (HEVC) is a high-efficiency video coding standard that reduces video file sizes by up to 50% compared to the older H.264 standard, saving massive amounts of hard drive space.

What hard drive is best for CCTV?

You should always use Surveillance-Grade hard drives (such as Seagate SkyHawk or Western Digital Purple). They are purpose-built to handle 24/7 continuous data writing, unlike standard desktop hard drives which will quickly fail under CCTV workloads.

CCTV Camera Storage Calculator

Accurately estimate your video surveillance needs with the CalcGami CCTV Camera Storage Calculator. Calculate required hard drive capacity based on resolution, FPS, compression, and days. Save your security logs and share specs via WhatsApp.

System Config

Number of Cameras

Resolution

Compression

Frame Rate (FPS)

Days of Storage Needed

Recording Frequency

Recommended HDD Size

0.0 TB

Ready to analyze your setup

Total Data (GB)

0 GB

Avg. Bitrate

0 Mbps

Saved Configurations

Date	Cams/Days	Size

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What is a CCTV Camera Storage Calculator?

A CCTV Camera Storage Calculator is an essential digital tool for security professionals, IT administrators, and homeowners planning a video surveillance system. When setting up an NVR (Network Video Recorder) or DVR (Digital Video Recorder), one of the most critical questions is: “How big of a hard drive do I need?” If you guess incorrectly, your system might overwrite crucial security footage before you even realize a crime occurred.

This calculator acts as your virtual security engineer. By factoring in your number of cameras, video resolution (e.g., 1080p, 4K), frame rate (FPS), video compression format (H.264 or H.265), and your desired retention period (days), it outputs the exact Terabytes (TB) of hard drive space required. It features History to compare different resolution setups, Save Calculation for your system architecture logs, and WhatsApp Share to send hardware requirements directly to your installation vendor or business partner.

Benefits of Using a CCTV Storage Calculator

Hard drives are a significant portion of any security budget. Using this calculator provides distinct financial, legal, and operational advantages:

Prevent Data Loss: Ensure you have enough storage to keep footage for your required timeframe (e.g., a full 30 days) before the system begins loop-recording and overwriting older video.
Cost Optimization: Don’t overspend on massive 16TB drives if a 4TB drive perfectly covers your 4-camera home setup.
Compliance Management: Many retail, medical, and corporate environments are legally required to retain security footage for a specific number of days. This tool ensures you remain compliant.
System Fine-Tuning: Discover how tweaking your settings—like lowering the frame rate from 30 FPS to 15 FPS, or switching to H.265 compression—can drastically reduce your storage costs.
Collaborative Planning: Use WhatsApp Share to text your client: “To record all 8 of your 4K cameras for 30 days, we will need exactly 12TB of storage. I’ve updated the quote!”

Formula Used in CCTV Storage Calculation

The calculator determines the total storage by first estimating the Bitrate (the amount of data processed per second) based on your selected resolution and compression, and then multiplying it by time.

1. The Base Storage Formula:
Storage (GB) = [ (Bitrate ÷ 8) × 3600 × 24 × Days × Cameras ] ÷ (1024 × 1024)

2. Variables Defined:
Bitrate (Kbps) = Video data rate (depends on Resolution, FPS, and Compression)
÷ 8 = Converts Kilobits (Kb) to Kilobytes (KB)
3600 × 24 = Converts seconds to hours, then hours to a full 24-hour day
Days = How long you want to keep the footage
Cameras = Total number of cameras recording
÷ (1024 × 1024) = Converts Kilobytes (KB) into Gigabytes (GB)

How to Use the CCTV Camera Storage Calculator

Enter Number of Cameras: Input how many cameras are currently (or will be) recording to your system.
Select Resolution & FPS: Choose the video quality (e.g., 2MP/1080p, 8MP/4K) and your desired Frames Per Second (15 FPS is standard for security).
Choose Compression: Select H.264 (older standard) or H.265 (High Efficiency Video Coding, which uses much less space).
Enter Recording Days: Input the number of days you need the footage to remain on the drive before overwriting (e.g., 14, 30, or 60 days).
Calculate: Click the button to instantly reveal the total Gigabytes (GB) or Terabytes (TB) of storage required.
Use Productivity Features:
- History: Compare the storage needs of a 1080p setup versus a 4K setup.
- Save Calculation: Store the result as “Warehouse Security Upgrade 2024.”
- Share on WhatsApp: Send the precise HDD requirements to your IT department before ordering hardware.

Real-Life Example

The Scenario: Imagine David, a small business owner. He is installing 4 cameras in his retail shop. They will record at 1080p resolution at 15 FPS using the newer H.265 compression. David wants to retain exactly 30 days of 24/7 continuous footage in case of theft.

The Details:

Cameras: 4
Estimated Bitrate (1080p, H.265, 15fps): ~1024 Kbps per camera
Days: 30

The Calculation:

1. Find KB per second: 1024 Kbps ÷ 8 = 128 KB/s
2. Find KB per day: 128 KB/s × 86,400 seconds = 11,059,200 KB/day
3. Total for 30 days: 11,059,200 × 30 = 331,776,000 KB per camera
4. Convert to GB: 331,776,000 ÷ 1,048,576 ≈ 316 GB per camera
5. Total for 4 Cameras: 316 GB × 4 = 1,264 GB (approx. 1.26 TB)

The Result: David needs at least 1.26 Terabytes of usable storage.

Action: David uses the Save Calculation feature. Knowing formatting takes up some space, he confidently buys a standard 2TB Surveillance Hard Drive, giving him plenty of buffer room.

Frequently Asked Questions (FAQ)

1. What is the difference between H.264 and H.265 compression?

H.265 (also known as HEVC) is a newer, highly efficient video compression standard. Compared to the older H.264 standard, H.265 can reduce your required hard drive storage space and bandwidth by up to 40% to 50% while maintaining the exact same video quality.

2. Can I use a regular PC desktop hard drive for my CCTV system?

It is highly discouraged. Regular PC hard drives are designed to read and write data intermittently. CCTV cameras write data 24/7 constantly. You should always buy a Surveillance-Grade Hard Drive (like WD Purple or Seagate SkyHawk), which are specifically engineered to withstand continuous 24/7 write cycles without failing.

3. Do I need 30 FPS (Frames Per Second) for security cameras?

Usually, no. While movies and TV shows play at 24 to 30 FPS for smooth motion, security footage is perfectly clear at 12 to 15 FPS. Dropping your cameras from 30 FPS to 15 FPS will essentially cut your hard drive storage requirements in half without compromising your ability to identify faces or license plates.

4. How can I save even more storage space?

Enable Motion Detection Recording instead of 24/7 continuous recording. This tells the NVR to only record video when it detects movement (like a person walking by). Depending on foot traffic, this can reduce your required storage by 50% to 80%.

5. Why does a 4TB drive only show 3.6TB of usable space?

Hard drive manufacturers define a Terabyte as 1,000 Gigabytes (Decimal), while computers read data in binary (1,024 Gigabytes = 1 Terabyte). Additionally, formatting the drive takes up system space. Always buy a drive slightly larger than your calculated requirement to account for this discrepancy.

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