CCTV Bandwidth Calculator
Calculate exactly how much internet upload speed and hard drive storage your security cameras need. Supports Hikvision, Dahua, Reolink, and all major NVR systems.
System Requirements:
Total Bandwidth (Upload Speed):
16.0 Mbps
Storage Required (Per 24 Hours):
172.8 GB
Storage Required (Per 30 Days):
5.18 TB
The Complete Guide to CCTV Bandwidth and NVR Storage
Planning a reliable video surveillance system involves much more than just mounting cameras on a wall. Whether you are installing a 4-channel NVR system for a residential home or outfitting a commercial retail space with 64 IP cameras, the math behind the system dictates its success.
If you fail to calculate your CCTV bandwidth correctly, your network will bottleneck, live streams will buffer, and your hard drives will fill up in days instead of months.
Why Upload Speed is the Silent Killer
A very common and costly mistake is assuming your "Gigabit Internet" can handle 4K security cameras effortlessly. Internet Service Providers (ISPs) heavily market their download speeds (e.g., 500 Mbps down).
However, IP cameras rely almost entirely on upload speeds.
When you are at work and you open your mobile app to check your home cameras, your NVR must "upload" that high-definition video stream to the cloud. If your internet plan offers 500 Mbps download but only 10 Mbps upload, a single 4K camera running at 30 FPS can completely max out your connection, causing your entire home network to lag.
You can use an internet bandwidth calculator to verify your actual upload capacity.
Practical Examples: Retail vs. Residential
Let's look at two real-world scenarios to see how configuration dramatically impacts your network:
Scenario A: The Small Retail Store
A shop owner installs 8 Dahua 4MP (2K) cameras. Because it's a store with high foot traffic, they set the cameras to 30 FPS with standard H.264 compression to ensure ultra-smooth footage of cash registers.
- Bandwidth Required: ~64 Mbps
- Storage per Month: ~20.7 Terabytes
Result: The owner has to buy extremely expensive NAS-grade hard drives to maintain 30 days of history, and viewing the cameras remotely causes the store's Point-of-Sale network to lag.
Scenario B: The Smart Residential Setup
A homeowner installs the exact same 8 Hikvision 4MP cameras. However, they consult a CCTV calculator first.
They optimize the settings to 15 FPS and enable H.265 (HEVC) compression.
- Bandwidth Required: ~19.2 Mbps
- Storage per Month: ~6.2 Terabytes
Result: By dropping to 15 FPS (which is still perfectly clear for identifying faces) and using modern compression, the homeowner cuts their storage costs by 70% and can comfortably view streams remotely.
The Magic of H.265 Compression
If you are struggling with rapidly filling hard drives, the absolute easiest solution is to log into your camera's web interface and enable H.265 (High Efficiency Video Coding). Unlike the older H.264 standard, H.265 uses advanced predictive algorithms to reduce file sizes by roughly 50% while maintaining the exact same visual clarity.
Converting Live Bandwidth to Storage
Network speed is always measured in Megabits per second (Mbps), while hard drives are measured in Terabytes (TB). Our calculator automatically converts your live bandwidth footprint into physical hard drive requirements.
If you prefer to manually calculate your NVR storage needs, you can use a Mbps to MB/s converter to find your per-second byte usage, and then multiply that number by 86,400 (the number of seconds in a 24-hour day).
Common CCTV Setups & Bandwidth
| Camera Configuration | Required Bandwidth | Storage (30 Days) |
|---|---|---|
| 4x 1080p Cameras (15 FPS, H.265) | 9.6 Mbps | 3.1 TB |
| 8x 4MP Cameras (15 FPS, H.265) | 38.4 Mbps | 12.4 TB |
| 16x 4K Cameras (30 FPS, H.264) | 256.0 Mbps | 82.9 TB |
| 32x 1080p Cameras (15 FPS, H.264) | 128.0 Mbps | 41.5 TB |