Picture quality
The higher the resolution and bitrate, the more stable bandwidth should be available per device.
As a conservative planning baseline, allow around 8 Mbps per HD device, 15 Mbps per Full HD device and 25 Mbps per 4K device. Add all devices used at the same time and include an additional 20 to 30 per cent headroom.
Enter your connection, picture quality and number of devices. The calculator creates a conservative planning value and shows where possible bottlenecks may lie.
With stable 5 GHz Wi-Fi, this example has a good amount of headroom.
The calculator uses quality guidelines, accounts for multiple simultaneous devices and adds headroom for protocol overhead, Wi-Fi and connection fluctuations.
The higher the resolution and bitrate, the more stable bandwidth should be available per device.
Multiple streams share the same internet connection. The planning value therefore increases with every active device.
The advertised plan speed is not always the speed continuously available at the device. Headroom helps absorb fluctuations.