Add the numbers for your scenario.
01Video & Streaming toolVideo or media file
Streaming Bitrate Calculator
Best bitrate for your upload speed, resolution and platform.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Streaming Bitrate Calculator
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyEvery upload limit is really a bitrate limit wearing a disguise. Fitting a video into a size cap means working backwards: the size and the duration are fixed, so the bitrate is whatever is left over.
What Streaming Bitrate Calculator does
Takes a target file size and a duration and returns the video bitrate that lands inside it, after subtracting the audio track and container overhead.
The relationship is simply size = bitrate × duration, which is why the same 25 MB limit is generous for a 30-second clip and impossible for an hour.
Inputs
| Video length | In minutes, from 0.1 |
|---|---|
| Target file size | In MB, from 1 |
| Audio bitrate | Subtracted from the budget — default 128 kbps |
| Returns | The video bitrate that fits |
| Core relationship | Size = bitrate × duration |
| Halve the duration | Doubles the bitrate you can afford |
| Halve the bitrate | Halves the file size |
| Use with | OBS, ffmpeg, or any encoder that takes a target rate |
Detailed steps
- Enter the duration and the size you must fit inside.
- Set the audio bitrate you intend to use — it comes out of the same budget.
- Take the video bitrate to your encoder.
Worth knowing
If the answer comes back under about 1000 kbps for 1080p, do not use it — drop the resolution instead. A frame that large starved of data looks blocky in exactly the places viewers look. The same bitrate at 720p, or 480p for a very tight budget, produces a visibly better result.
Frequently Asked Questions
The bitrate it gives me looks impossibly low.
Then the target is too small for the duration, and no encoder setting fixes that. Your options are a shorter clip, a lower resolution, or a bigger limit. Trimming is usually the least painful, because it removes data at full quality rather than degrading all of it.
Why does audio come out of the budget?
Because the limit applies to the finished file, and the audio track is inside it. At 128 kbps audio takes about 1 MB per minute — on a 25 MB cap for a ten-minute video that is 40% of the space.
Should I use this or the Video Compressor?
The compressor does this arithmetic and the encoding in one step. This tool is for when you are configuring something else — OBS, a hardware encoder, an ffmpeg command — and just need the number.
Is a higher bitrate always better?
Only up to the point where the frame can use it. Beyond that you are storing detail no one can see, and running into upload limits for nothing. The resolution ladder in the OBS assistant shows roughly where that point is.
Is Streaming Bitrate Calculator free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Streaming Bitrate Calculator runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Streaming Bitrate Calculator works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.