Multistream Bandwidth Calculator
Calculate the upload speed you need to stream to multiple platforms at once — whether you're using a relay service or OBS multi-output.
Multistream method
Bandwidth requirement
Stream to 30+ platforms simultaneously with one upstream connection. Free plan available — paid plans include full-quality passthrough and custom RTMP destinations.
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How the calculation works
There are two ways to multistream. With a relay service (Restream.io, Streamlabs Multistream), you send one stream and the service copies it to each platform — your upload requirement is the same as a single-platform stream.
With OBS multi-output, OBS encodes and uploads each stream independently. Your total upload requirement is the sum of all stream bitrates. The calculator adds a 25% headroom buffer to account for network jitter and bitrate spikes.
Frequently asked questions
Which method is better — relay or OBS multi-output?
Relay services are easier and use less bandwidth, but introduce a small amount of additional latency and may degrade quality at their re-encoding step. OBS multi-output gives you full control and quality for each destination but requires much more upload bandwidth and CPU.
Does a relay service affect stream quality?
It depends on the service. Premium relay plans typically pass your stream through without re-encoding (passthrough). Free or lower-tier plans may re-encode, which can reduce quality. Check the service's documentation for their passthrough policy.
Why does the calculator add 25% headroom?
Network conditions fluctuate, and OBS bitrate can spike above the target during complex scenes. Using 75% or less of your total upload prevents the encoder from competing with network overhead and causing dropped frames.
Can I multistream on Twitch Partner?
Twitch's non-exclusivity policy was relaxed in 2023. Partners can now simulcast to other platforms. Affiliates were already allowed to multistream. Check Twitch's current Terms of Service for the latest requirements.