NVR bandwidth planning is straightforward when you work from bitrate. Add the expected bitrate of every camera, then account for overhead, viewing, and future growth.
Step 1: determine camera bitrate
Use manufacturer configuration values, actual observed bitrate, or a conservative planning value. Do not estimate only from resolution.
Step 2: multiply by camera count
Sixteen cameras at 5 Mbps each produce roughly 80 Mbps of aggregate camera traffic.
Step 3: add overhead and growth allowance
A design with no headroom becomes fragile when a camera changes bitrate, a new camera is added, or multiple users begin live viewing.
Step 4: compare with recorder interfaces
Check the recorder NIC, switch uplinks, and any inter-switch trunks carrying camera traffic.
Step 5: consider remote viewing
WAN upload can matter more than LAN bandwidth when operators view many streams remotely.
The Camera Bandwidth Calculator automates these checks.
Example
If 24 cameras average 4 Mbps, the camera total is 96 Mbps. With a 20% planning allowance, design traffic is about 115 Mbps. A 100 Mbps uplink would be undersized; a 1 Gbps uplink provides substantial room.
Pair bandwidth with retention
Once bitrate is known, use the NVR Storage Calculator for storage planning.
Frequently asked questions
Can a 100 Mbps port handle 16 cameras?
Possibly, but only if total bitrate plus overhead stays safely below the interface limit. Calculate rather than assume.
Do I need a 10 Gbps uplink for cameras?
Most small systems do not, but large deployments or high aggregate bitrates can justify faster uplinks.
Should remote viewing traffic be added?
Yes, if remote users consume additional streams or transcoded feeds over the WAN.
Camera bandwidth formula
For example, 20 cameras averaging 6 Mbps each create roughly 120 Mbps of recording traffic before design headroom, remote viewing, additional streams, or other recorder traffic.
Use average configured bitrate where possible. Resolution alone is not enough because codec, frame rate, scene complexity, and bitrate controls change actual network load.
Use the free Camera Bandwidth Calculator to estimate total ingest traffic and recommended network headroom.
Open Camera Bandwidth Calculator →