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To estimate the upload speed needed for a nonstop YouTube stream, take the encoder’s total bitrate and divide by 0.8. That reserves the 20% upload headroom YouTube recommends: a 10 Mbps feed calls for about 12.5 Mbps of available upload capacity. To estimate data use, multiply a steady bitrate in Mbps by 10.8 for decimal gigabytes per day. These calculations apply to the live feed sent from your encoder to YouTube, not to delivery of the stream to viewers.
What bandwidth you need to calculate
For a prerecorded-video livestream, your encoder still sends a live feed to YouTube for as long as the stream is running. The relevant rate is the encoder’s configured total output bitrate, including audio—not the size of the original video file and not the number of viewers. YouTube transcodes the incoming live feed into multiple output formats for viewers, so audience size does not multiply your outbound upload requirement. YouTube’s live encoder settings guidance describes the ingest stream and its transcoding.
Use upload speed, not download speed. YouTube notes that inbound bandwidth is often greater than outbound bandwidth, and that other people or devices sharing the connection can reduce capacity available to the encoder. Its recommendation is to leave 20% room above the total stream bitrate. YouTube’s streaming tips say the total bitrate must not exceed available upload bandwidth and recommend 20% headroom.
Use the live ingest bitrate for your video settings
Choose the row matching the stream resolution, frame rate, and codec in YouTube’s live ingest recommendations. The figures below use YouTube’s recommended H.264 rates; the upload targets are calculated estimates (recommended bitrate ÷ 0.8), not separate values published by YouTube. The YouTube page also lists recommended values for AV1 and H.265/HEVC, so use the row for the codec actually selected in your encoder. Check YouTube’s current live encoder table before configuring a stream; its recommendations can change.
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| Live ingest format (H.264) | YouTube recommended bitrate | Estimated available upload target with 20% headroom |
|---|---|---|
| 720p30 | 8 Mbps | 10 Mbps |
| 720p60 | 8 Mbps | 10 Mbps |
| 1080p30 | 14 Mbps | 17.5 Mbps |
| 1080p60 | 17 Mbps | 21.25 Mbps |
| 1440p30 | 21 Mbps | 26.25 Mbps |
| 1440p60 | 34 Mbps | 42.5 Mbps |
| 2160p30 (4K) | 42 Mbps | 52.5 Mbps |
| 2160p60 (4K) | 50 Mbps | 62.5 Mbps |
These are ingest settings for a live encoder, not YouTube’s separate recommendations for uploading a video file. Do not substitute the upload-file table for the live-stream table.
Calculate the upload capacity step by step
- Set the intended output. Decide the resolution and frame rate that make sense for the source video and channel.
- Find the matching live ingest bitrate. Use the recommendation for the selected codec and format in YouTube’s live encoder table.
- Calculate headroom. Divide the total stream bitrate by 0.8. For example, 14 Mbps ÷ 0.8 = 17.5 Mbps of available upload capacity for a 1080p30 H.264 feed.
- Account for other traffic. The target is capacity available to the stream. If devices or other encoders use the same connection, allow for their traffic too. For simultaneous primary and backup feeds, add their total bitrates first, then divide by 0.8, as YouTube’s network guidance concerns the total bitrate.
- Measure the actual connection. Run an upload speed test on the same connection the encoder will use, then check again during normal household or workplace network use. A test is a snapshot; it does not prove the connection will remain stable around the clock.
Estimate monthly data use
For a constant encoded rate of R Mbps, estimate decimal data transfer with these formulas:
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- Per 24 hours: R × 10.8 = approximate decimal GB.
- Per 30 days: R × 324 = approximate decimal GB.
For example, a continuous 10 Mbps feed transfers about 108 decimal GB in a day and 3,240 decimal GB (3.24 TB) in 30 days. At 50 Mbps, the estimates are about 540 GB per day. These are arithmetic estimates assuming an uninterrupted constant bitrate, before overhead and retransmissions; actual transfer and an internet provider’s billing calculation may differ.
| Steady bitrate | Approximate data per day | Approximate data per 30 days |
|---|---|---|
| 8 Mbps | 86.4 GB | 2,592 GB |
| 14 Mbps | 151.2 GB | 4,536 GB |
| 50 Mbps | 540 GB | 16,200 GB |
Encoder and connection settings that affect the estimate
Bitrate and audio
YouTube recommends constant bitrate (CBR) for the listed RTMP/RTMPS live settings. Use the recommendation for your chosen resolution, frame rate, and codec as a planning baseline. Its listed audio recommendations are 128 Kbps for stereo or 384 Kbps for 5.1 audio. Include audio in the total output rate when estimating bandwidth; do not add it twice if the encoder’s configured bitrate already represents total output.
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Keyframes and ingest protocol
YouTube recommends a 2-second keyframe interval and says not to exceed 4 seconds. It recommends RTMPS, the secure extension to RTMP, for live ingestion. A stream key identifies the incoming feed and functions like a password, so keep it private. See YouTube’s encoder settings guidance and its stream key guidance for current setup details.
Network connection
Use a connection whose measured upload capacity exceeds the calculated target under ordinary network load. For a computer that can connect to the router by cable, Ethernet may avoid some wireless variability, but a cable cannot increase the upload speed supplied by the internet service. If measured upload capacity falls short, reduce the selected bitrate or investigate a plan with greater upload capacity; no particular provider or plan can be recommended from these calculations alone.
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Common calculation and reliability mistakes
- Checking download speed instead of upload: the encoder sends data out to YouTube, so outbound capacity is the relevant measurement.
- Using the bitrate for a file upload: a prerecorded source does not make the live ingest feed a file upload; use YouTube’s separate live encoder recommendations.
- Buying a plan that only barely matches the bitrate: leave the recommended 20% headroom and account for shared network traffic.
- Multiplying your upload requirement by viewers: the encoder sends its feed to YouTube; YouTube transcodes it for viewers.
- Treating one speed test as a 24/7 guarantee: network interruptions can still disrupt a nonstop stream. Test with the actual encoder and monitor the feed rather than relying only on a peak speed result.
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