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The short answer
Streaming in HD typically uses a few gigabytes an hour, and 4K can use several times more. As a rough guide, plan for about 5 to 8 Mbps per HD stream and 15 to 25 Mbps per 4K stream, and add up everyone streaming at once. On a capped line, choose HD.
These are rough guides. Services publish their own figures, and those change.
| Picture quality | Rough speed per stream | Rough data per hour |
|---|---|---|
| Standard definition | About 3 Mbps | Around 1 GB or less |
| HD | About 5 to 8 Mbps | Around 2 to 3 GB |
| 4K | About 15 to 25 Mbps | Up to about 7 GB |
Say two people watch 4K for two hours each every night. That is four hours of 4K, or up to roughly 28 GB a night and over 800 GB a month. In HD, the same viewing is roughly 8 to 12 GB a night. This is an illustration, not a prediction.
Speed isn’t the only cause. Weak Wi-Fi at the TV is more common. Read why Apple TV buffers.
Netflix publishes figures, and 4K can use up to about 7 GB an hour. Check Netflix for the current numbers.
Not strictly, but a reliable line makes streaming smoother. Capped connections need careful quality settings.
Live satellite channels on a decoder use none.
Roughly 15 to 25 Mbps per stream, plus whatever else is using the line.
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