Short answer: for one 4K stream, 15 to 25 Mbps is enough: Netflix and Prime Video recommend 15 Mbps, YouTube 20 and Disney+ 25. For a household, add up everything that runs at once and leave headroom. The non-obvious catch is that the number which matters is the speed at the television during the evening, which is often far lower than the plan's headline figure.
At a glance
Speed for 4K streaming
| Netflix 4K | 15 Mbps or higher |
| YouTube, Disney+ | 20 to 25 Mbps |
| Live 4K sport | Plan on about 25 Mbps |
| Typical family | 100 to 200 Mbps plan |
| Data per hour | About 7 GB or more |
What the services recommend
Each streaming service publishes its own guidance. These are the figures for a single 4K stream, as published by the services in 2026. They're recommendations for a steady connection, not bare minimums.
| Service | 4K / Ultra HD | Full HD (1080p) |
|---|---|---|
| Netflix | 15 Mbps or higher | 5 Mbps |
| Amazon Prime Video | 15 Mbps | 5 Mbps |
| YouTube | 20 Mbps | 5 Mbps |
| Disney+ | 25 Mbps | 10 Mbps (around) |
| Apple TV+ | 25 Mbps | 8 Mbps (around) |
| HBO Max | 25 Mbps | 5 Mbps |
Netflix lowered its 4K recommendation from 25 Mbps to 15 Mbps as its video compression improved, which is why older articles quote the higher number.
Live 4K is different. Live sport in 4K, from Sky, TNT Sports, DAZN or US services like YouTube TV and Fubo, often runs at a higher bitrate than on-demand films, because there's no time to compress it as efficiently. Planning for 25 Mbps per live 4K stream is sensible.
Add up the household
A single stream is rarely the whole story. Evening use in a family home typically looks like this:
| Activity | Rough bandwidth |
|---|---|
| One 4K stream | 15 to 25 Mbps |
| One HD stream | 5 to 8 Mbps |
| Video call | 2 to 4 Mbps |
| Online gaming (not downloading) | 1 to 5 Mbps |
| Background phone and laptop activity | 5 to 10 Mbps |
| Games console or app update downloading | Whatever is left |
Two 4K streams, an HD stream on a tablet and a couple of phones in use comes to around 60 to 70 Mbps. Add a large game download and even a 100 Mbps line can run short for a few minutes.
A practical rule: take the total of what you'd realistically run at once, and aim for a plan about 50 per cent above it. The headroom absorbs peak-time dips and the difference between advertised and real speed.
Which broadband speed to choose
| Household | Suggested plan |
|---|---|
| 1 to 2 people, one 4K TV | 50 to 80 Mbps |
| Family, two 4K TVs plus phones | 100 to 200 Mbps |
| Large household, several 4K screens, gaming, working from home | 300 Mbps or more |
Upload speed matters less for streaming but matters for video calls and cloud backups. Full-fibre plans usually offer much better upload speeds than older connections.
Peak-time speed is what counts. In the UK, Ofcom's code of practice means providers must give an estimate of the speed you'll get at peak times, and many publish an average peak-time figure. That's the number to compare, not the headline.
Why your 4K still buffers on a fast line
The most common reason for poor 4K on a fast connection is that the speed never reaches the television.
Wi-Fi loses a lot. A router can deliver 500 Mbps a metre away and 20 Mbps two walls later. Speed tests on your phone next to the router tell you nothing about the stick behind the TV. Run the test on the TV or streaming device itself. Our Ethernet vs Wi-Fi guide goes through the options.
Consistency matters more than peaks. A connection that averages 50 Mbps but dips to 10 Mbps every few minutes will drop 4K quality, especially on live streams, which buffer only a few seconds ahead.
Older devices hold things back. Early streaming sticks and older smart TVs have slower Wi-Fi chips and may not decode newer, more efficient codecs such as HEVC and AV1, forcing higher bitrates. See our guide to streaming boxes.
Evening congestion. Shared networks slow at peak times. If 4K is fine at lunchtime and not at 9pm, that's the network, not your plan. We cover this in our article on ISP throttling.
Checking what you're actually getting
Test on the device. Fire TV, Apple TV, Android TV and most smart TVs have a network test in their settings, or you can install a speed test app. Netflix's Fast.com also works in a TV browser.
Test at the time you watch. A test at 10am says nothing about 9pm.
Check the stream itself. Many apps show stream information. Netflix, for instance, lets you see the current resolution through a diagnostic overlay on some devices. YouTube's "stats for nerds" shows the connection speed and resolution in real time.
Check your plan's tier. Some services require a premium tier for 4K. Netflix's Ultra HD requires its Premium plan, and several sports broadcasters charge extra for 4K. A fast connection won't unlock 4K on a plan that doesn't include it.
Codecs, HDR and why the numbers differ
Two services can deliver 4K pictures of similar quality at quite different bitrates. The difference lies mostly in the video codec, the method used to compress the picture.
Older streams use H.264, which needs a lot of data for 4K and is rarely used for it now. HEVC (H.265) roughly halves that, and is the standard for most 4K streaming. AV1, used increasingly by YouTube and Netflix, saves a further share on devices that support it.
This is why the device matters. A streaming stick or TV that can decode AV1 may get a 4K picture at a lower bitrate than an older one that can't, so the same connection looks better on newer hardware.
HDR and Dolby Vision add a little data on top, and higher frame rates, such as the 50 frames a second used for live sport in Europe, add more. That's another reason live 4K sport tends to need the upper end of the range.
Audio adds very little. Even Dolby Atmos soundtracks are a small fraction of a 4K stream's bitrate, so they rarely change what speed you need.
Data usage
4K streaming uses a lot of data: roughly 7 GB an hour at 15 Mbps, and more at higher bitrates. Most home broadband is unlimited, but some mobile, satellite and 5G home broadband plans have caps or fair-use limits.
A household watching three hours of 4K a day uses around 600 GB a month on that alone. If your plan has a cap, most services let you set a lower default quality to save data.
5G and mobile broadband
5G home broadband can easily carry 4K where signal is strong, but speeds fluctuate more than on fixed lines, and some plans limit video resolution. In the US, for example, Verizon's 5G Home plans are optimised for up to 1080p video except on the top tier, which allows 4K. Check the plan terms before relying on it for a 4K TV.
Quick answers
What internet speed do I need for 4K? Netflix and Prime Video recommend 15 Mbps per 4K stream, while YouTube suggests 20 Mbps and Disney+ 25 Mbps. For live 4K sport, plan on about 25 Mbps.
Is 50 Mbps enough for 4K? For one or two 4K streams with light other use, yes, provided the speed actually reaches the TV. Larger households benefit from 100 Mbps or more.
Is 100 Mbps enough for 4K streaming? Yes for most families. It comfortably carries two or three 4K streams alongside phones and laptops.
Why does 4K buffer on my fast internet? Usually Wi-Fi losses between the router and the TV, peak-time congestion, or an older device. Test speed on the TV itself.
How much data does 4K streaming use? Roughly 7 GB an hour at 15 Mbps, and more at higher bitrates. That's around 600 GB a month for three hours a day.
Do I need a special plan for 4K on Netflix? Yes. Netflix's Ultra HD is only available on its Premium plan, whatever your connection speed.
Is live 4K sport more demanding? Generally yes. Live streams are compressed less efficiently and buffer less far ahead, so they need more speed and a steadier connection.
Services revise their speed recommendations as compression improves, and plan terms change. Figures here are those published by each service at the time of checking. Checked September 2026.