Online Tool Store
Video Bitrate Calculator
Calculate video bitrate from a target file size, or file size from a bitrate, including the audio track and container overhead.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Video
Video Bitrate Calculator
Frontend preview — no upload or external service.
Required bitrate
500 MB over 12:30 gives about 5,330 kbps total. Minus 192 kbps audio and roughly 2% container overhead, the video track gets about 5,030 kbps.
How the Video Bitrate Calculator works
- Enter the duration and whichever of size or bitrate you know.
- Subtract the audio track, which is a fixed cost independent of the video.
- Compare the result against what the resolution actually needs; a low figure at high resolution will look soft whatever the encoder does.
The method
File size is bitrate multiplied by duration, with the two audio and video streams adding together and the container adding a small overhead.
size (MB) = total bitrate (kbps) × duration (s) ÷ 8 ÷ 1024
500 MB over 750 seconds needs about 5,330 kbps total, and the audio track comes out of that budget before the video gets any.
FAQ
What bitrate does my resolution need?
It depends on the codec and the content. A static talking head needs far less than fast motion at the same resolution, and a modern codec does more with less. Treat published tables as a starting range rather than a rule.
Why is my file bigger than the calculation?
Container overhead, and variable-bitrate encoding overshooting its target on complex scenes. Two-pass encoding hits a target size far more accurately than single-pass.
Should I lower resolution or bitrate?
When the bitrate budget is tight, lowering resolution usually looks better than starving a high resolution. A sharp 1080p beats a blocky 4K at the same file size.
How we compare
| Feature | Online Tool Store | A video editor | An upload-based service |
|---|---|---|---|
| Includes audio and overhead | ✓ | Often ignored | ✓ |
| Solves in any direction | ✓ | Manual | ✓ |
| No encoder needed | ✓ | ✗ | ✓ |
| Nothing uploaded | ✓ | ✓ | ✗ |
Video Bitrate Calculator subtracts audio and container overhead first, which is why hand calculations routinely overshoot an upload limit.