FREE · NETWORK & IT INFRASTRUCTURE
Network Bandwidth Calculator.
Work out the download and upload bandwidth an office or site needs from its users and applications, with headroom and a recommended link.
- Recommended download
- 300 Mbps
- Recommended upload
- 200 Mbps
- Symmetric link (fibre, dedicated)
- 300 Mbps
- Headroom factor applied
- × 1.95
Demand at peak
| Application | Active users | Down | Up |
|---|---|---|---|
| Web browsing and SaaS apps | 36 | 54 Mbps | 10.8 Mbps |
| E-mail and chat | 48 | 9.6 Mbps | 4.8 Mbps |
| Video meeting 1080p | 12 | 36 Mbps | 45.6 Mbps |
| VoIP call G.711 (Ethernet, 20 ms) | 6 | 523.2 kbps | 523.2 kbps |
| Cloud backup and file sync | 6 | 30 Mbps | 30 Mbps |
| Total before headroom | 130.12 Mbps | 91.72 Mbps |
- Per-user rates are typical published recommendations (video meeting, streaming and VoIP vendors); replace them with your vendor’s figures.
- Consumer links are often asymmetric: video meetings and cloud backup usually make upload the limit.
- For voice and video, quality also depends on latency, jitter and QoS, not only on bandwidth.
How to use Network Bandwidth Calculator
Add one row per application with the number of users, the share active at peak and the per-user rate; profiles fill typical values. Adjust overhead, growth and maximum utilisation.
How it works
Active users × per-user rate, summed per direction, then multiplied by protocol overhead and growth and divided by the maximum utilisation of the link.
Example
60 users browsing, meeting in 1080p, calling and syncing files need about 254 Mbps down and 179 Mbps up with headroom: a 300 Mbps symmetric link.
How much bandwidth does an office need?
Bandwidth planning starts from what people do, not from a number of employees. Ten people in video meetings need more upload than a hundred people reading e-mail. List each application with the number of users, the share active at the busiest moment and the rate one active user needs; the calculator adds them up separately for download and upload.
Typical rates per active user
| Application | Download | Upload |
|---|---|---|
| Web browsing and SaaS | 1.5 Mbps | 0.3 Mbps |
| Video meeting 720p | 1.5 Mbps | 1.5 Mbps |
| Video meeting 1080p | 3 Mbps | 3.8 Mbps |
| VoIP call G.711 | 87.2 kbps | 87.2 kbps |
| HD video streaming | 5 Mbps | 0.05 Mbps |
| 4K video streaming | 15 Mbps | 0.1 Mbps |
| Cloud backup and sync | 5 Mbps | 5 Mbps |
These are typical published recommendations used as defaults. Replace them with the figures from your own meeting, telephony or backup vendor; for telephony, the VoIP bandwidth calculator computes the exact rate for each codec.
Headroom
Three factors turn the raw demand into a link size. Protocol overhead and bursts (20 % by default) cover headers, retransmissions and short spikes. Growth headroom covers new staff and new applications. The maximum utilisation (80 % by default) keeps queues short, because latency rises sharply as a link approaches full use. The result is rounded up to common link speeds for download, upload and a symmetric fibre or dedicated line.
Upload is often the limit
Consumer and many business broadband links offer far less upload than download. Video meetings, cloud backup and cameras streaming to the cloud all send data, so check the upload figure first. When the link is shared with voice, quality of service (QoS) that prioritises voice matters as much as raw capacity. To check what a link really delivers, run the internet speed test; to size the firewall in front of it, the firewall sizing calculator.
Questions about Network Bandwidth Calculator
How much bandwidth per employee?
There is no single figure: office work with occasional meetings often needs 2–5 Mbps per person at peak, while video-heavy or design teams need much more. Model your applications instead of using a per-head rule.
Why not size the link at 100 % of demand?
A link near full use queues packets, which adds latency and jitter that video and voice notice before data transfers do.
Is Network Bandwidth Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Per-user rates are typical published recommendations; replace them with your vendor’s figures. Latency, jitter and QoS are not modelled. Everything is calculated in your browser; nothing is sent or probed on the network. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.