How much speed does 4K streaming need, room by room?

You pay for hundreds of megabits and 4K needs fifteen. The gap between those numbers is where the buffering hides.

Published · 2 min read

In this guide
  1. So why does a 500 Mbps plan buffer?
  2. Add up your household
  3. What to do with this
  4. Measure where the screens are

The numbers are smaller than most people expect. Netflix's own help page recommends a steady connection of:

  • 3 Mbps or higher for HD (720p)
  • 5 Mbps or higher for Full HD (1080p)
  • 15 Mbps or higher for 4K

Other services publish figures in the same range. Check the current page of the one you use, because these change.

So why does a 500 Mbps plan buffer?

Because the plan describes what arrives at the router. Streaming depends on what arrives at the TV, and on how steady it is.

  • Speed falls with every wall. A line that delivers hundreds of megabits at the router can deliver a small fraction two rooms away: see how far Wi-Fi reaches indoors.
  • TVs are badly placed for radio. Low, against a wall, with the antenna behind a big screen: see smart TV buffering on Wi-Fi.
  • Steady matters more than fast. The word in the recommendation is stable. A link that averages 30 Mbps but dips to 2 every few seconds will lower the picture quality or pause.
  • You're not alone on the line. Each stream adds up.

Add up your household

A rough evening in a family home:

  • Two 4K streams: about 30 Mbps
  • One HD stream on a tablet: about 5 Mbps
  • A video call: a few Mbps in each direction
  • Phones, updates, a console download: whatever is left

That's still well under 100 Mbps. Almost any modern line is enough if it reaches the rooms where the screens are.

What to do with this

  1. Stop comparing plans. If you already have 50 to 100 Mbps and it buffers, a faster plan won't fix it.
  2. Check each room that has a screen. Living room, bedroom TV, the kitchen tablet.
  3. Give the main TV a cable if you can. It frees the Wi-Fi for everything that moves: see powerline adapters and Ethernet over coax.
  4. Put a node near the far TV, not near the router: see where to put a mesh node.
  5. Prefer 5 GHz near the router: see 2.4 GHz or 5 GHz by room.

Measure where the screens are

A speed test next to the router tells you about your contract. To know about your evenings, measure in front of each TV with WiFi Heatmap. It shows how the connection responds in that exact spot, and whether it's steady, which is what streaming actually asks for.