Video
Duration and file-size calculator
Estimate how big a clip will be from duration and bitrate.
This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.
What this tool does
size_bytes = (video_kbps + audio_kbps) * 1000 * duration / 8. Container overhead is omitted, so real files are slightly larger.
How to use it
- Enter duration and bitrates.
- Read the estimated bytes.
- Compare with platform upload limits.
Supported input
- Duration and bitrates, or a file to reverse the estimate
Output
- Estimated bytes and a human-readable size
Privacy
This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.
ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: N/A. Limit: 80 MB if using a file (80.00 MB).
Limitations
- Overhead omitted.
- VBR makes this an average.
Example
60 s, 8000 kbps video, 192 kbps audio
about 61.4 MB
Troubleshooting
- The export was larger
- Keyframes, B-frames, and container headers add bytes. Leave headroom under a platform cap.
FAQ
Does this include thumbnails?
No. Only the audio+video bitrate model.
Can I plan a podcast video?
Yes, but talking-head content often looks fine at lower video bitrates than 8000 kbps.
Is MB mega-byte or mebi-byte?
Display uses 1024-based MiB-style MB as in the rest of ConvertPass, labelled as MB for familiarity.
Will you transcode to hit a size?
Not in phase one. That is processing, not discovery.
Related tools
- Video bitrate calculator
Turn file size and duration into an estimated bitrate, locally.
- Social video export settings
Use researched starting points for social exports, with the re-encode caveat attached.
- Video file inspector
Read duration and resolution from a video without uploading it.
Related guides
Related formats
Last reviewed 16 August 2026. Report a problem. Reports do not include your input.