It depends on whether you mean watching the stream or broadcasting prerecorded video as a live stream. For a viewer, estimate daily use from the actual playback bitrate: Mbps × hours watched × 0.45 = approximate decimal GB. At 24 hours, that is Mbps × 10.8; for example, playback at 2 Mbps uses about 21.6 GB and 5 Mbps about 54 GB. These are bitrate calculations, not measured YouTube averages.
For the broadcaster, YouTube gives a separate mobile-live rule of thumb: about 10 MB per minute, or roughly 14.4 GB of upload data for 24 hours of continuous streaming. That figure describes sending a live stream to YouTube, not watching one.
Viewer data use: estimate from playback bitrate
There is no single daily data figure for watching a prerecorded YouTube live stream. The video quality delivered to a device, its playback bitrate, and the amount of time watched determine the estimate. YouTube transcodes live streams into different output formats for viewers, so the broadcaster’s upload bitrate does not automatically equal a viewer’s playback bitrate (YouTube’s encoder guidance).
For decimal gigabytes, use this formula:
Approximate GB = playback bitrate in Mbps × watch time in hours × 0.45
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The conversion uses 8 bits per byte and 1,000 megabytes per decimal gigabyte. For a full day, 1 Mbps sustained for 24 hours is 10.8 GB.
| Actual playback bitrate | Estimated use in 24 hours |
|---|---|
| 1 Mbps | 10.8 GB |
| 2 Mbps | 21.6 GB |
| 5 Mbps | 54 GB |
These are arithmetic examples only, not YouTube-published playback rates. If you watch for less than 24 hours, use the actual hours in the formula rather than the daily multiplier.
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Why resolution and connection-speed recommendations are not data figures
Higher-quality playback generally requires more data, but resolution alone does not give an exact daily total. YouTube’s troubleshooting guidance lists sustained connection-speed recommendations of 20 Mbps for 4K, 5 Mbps for 1080p, 2.5 Mbps for 720p, 1.1 Mbps for 480p, and 0.7 Mbps for 360p (YouTube playback troubleshooting). These are recommended connection speeds, not actual playback bitrates or measured consumption.
Do not treat a recommended speed as the video’s bitrate without labeling it as a rough proxy. The bitrate delivered to a particular device can vary, and YouTube’s published encoder settings describe what a broadcaster sends to YouTube, not a guaranteed rate for every viewer.
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Broadcaster data use is upload, not viewer download
If you mean running prerecorded footage as a live broadcast, the stream consumes data in the upload direction from the broadcasting setup to YouTube. YouTube’s mobile live-streaming tips give about 10 MB per minute as a rule of thumb for streaming from a mobile device. At that approximate rate, uninterrupted broadcasting for 24 hours works out to 14.4 GB uploaded.
This is a YouTube-published rule of thumb, not a universal measured rate. Actual use can differ with the stream setup. YouTube’s encoder guidance includes ingestion recommendations by resolution, frame rate, and codec, and an advanced setting of 128 Kbps stereo audio; these are source-side settings and do not establish what viewers consume.
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Measure your own playback for a closer estimate
- Choose the device, network, and playback quality you expect to use.
- Check the device’s or mobile carrier’s data counter immediately before playback.
- Play the stream for a representative period, then check the counter again and note the elapsed time.
- Scale the observed data use to your expected daily viewing time. For example, multiply a one-hour reading by the number of hours you plan to watch.
A measured total may differ from the bitrate calculation because of ads, buffering, app traffic, and the device or carrier’s measurement conventions. For the fairest comparison, record the quality, duration, network, and whether the number is upload or download.
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What YouTube’s upload bandwidth advice means
YouTube recommends leaving 20% extra bandwidth headroom for broadcasting and notes that shared networks can limit the bandwidth available to an individual streamer (YouTube streaming tips). This is advice for upload reliability; it is not a multiplier to apply to a viewer’s daily download estimate.
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