Stream Bitrate Calculator for OBS, Twitch & YouTube

Turning upload speed into a bitrate

Your Bitrate is how much data you push to the platform every second, and it has to fit inside your upload — not your download, which is usually the big number your provider advertises. Run a speed test and read the upload figure.

Then leave headroom. This calculator targets 75% of your measured upload, which is why it is suggesting 10,000 Kbps: for this resolution and content type to stop being limited by your connection you would want around 14 Mbps of upload. Streaming at 100% of a measured link is the most common cause of Dropped Frames — the measurement was a best case, and a video call, a backup or a phone on the same wifi eats the difference.

• Measure at the time you actually stream. Evening upload on a shared line can be half the midday figure.
• Use a cable if you can. Wifi does not fail gracefully — it holds a stable rate and then loses a burst, which is exactly what a live encoder cannot recover from.
• Multistreaming multiplies this. Sending the same stream to three platforms from one machine needs three times the upload; sending it once to a service that fans it out does not.

CBR or VBR

Use CBR — constant bitrate — for anything live. VBR saves bandwidth by dropping the rate during quiet moments, which sounds sensible until the action returns and the rate jumps back up.

Twitch describes exactly what goes wrong: a route that was fine at the low rate may not absorb the spike, and the result is what they call broadcast starvation — buffering and dropped frames for every viewer, including the ones watching a lower quality. Kick does not offer the choice at all; it requires CBR, and on a Mac that means selecting the x264 encoder, since the hardware encoder there will not do it.

VBR is the right choice for a file you are going to upload later. It is the wrong choice for a socket held open to an ingest server.

Why a stream drops frames

Dropped Frames have two causes and they need opposite fixes. If your encoder cannot keep up, the problem is CPU or GPU. If the network cannot keep up, the problem is bitrate. Work through it in this order.

1. Lower the bitrate first. Kick's own troubleshooting advice is to drop by 1,000 Kbps at a time until the stream is clean. It costs you less quality than you expect and it tells you immediately whether the network is the constraint.
2. Then ease the preset. Twitch notes that x264 presets above Faster need a CPU with six or more cores. If yours has fewer, a slower preset is not buying quality, it is buying dropped frames. Move to veryfast, or to superfast on Kick's advice.
3. Move the encode off the CPU. Twitch rates NVENC on Turing and later — RTX 20 series, GTX 1660 — as better than x264 Fast and about level with medium, while leaving the CPU free. On older Pascal and Kepler cards it lands nearer veryfast.
4. Only then drop the resolution. A clean 720p stream beats a 1080p one that stutters, and viewers notice the stutter far more than the pixels.

What a round-the-clock stream runs into

Bitrate stops being the interesting question once a stream is meant to stay up for weeks. The platforms publish ceilings on how long a single broadcast may run, and they are shorter than people expect: Facebook ends a live video at 8 hours — 12 for some Premium partners — and its own guidance is to schedule a break, end the stream and restart immediately. Twitch caps a single broadcast at 48 hours. YouTube publishes no such ceiling.

So a channel that is live all day is not one long stream. It is a sequence of streams, and something has to notice the end of each one and start the next — through a reconnect, a dropped ingest, a platform-side cut at the hour limit. Doing that from a computer at home means the computer never sleeps and never updates.