What internet speed do I need for 4K streaming?

A single 4K stream needs about 25 Mbps, so even a modest plan handles one TV. The real question is how many simultaneous streams plus other activity you run: a family with three 4K streams, gaming, and video calls is comfortable at 300-500 Mbps. Just as important is an uncapped plan, since 4K streaming burns through data-capped allotments quickly.