Calculator Inputs
This tool estimates storage from combined stream bitrates and total runtime.
Bitrate Composition Graph
Example Data Table
| Scenario | Video | Audio | Subtitle | Duration | Overhead | Estimated Size |
|---|---|---|---|---|---|---|
| Streaming Lesson | 4 Mbps | 0.192 Mbps | 0.005 Mbps | 00:45:00 | 2% | 0.86 GB |
| Webinar Archive | 6 Mbps | 0.256 Mbps | 0.010 Mbps | 01:30:00 | 3% | 2.62 GB |
| Training Backup | 12 Mbps | 0.320 Mbps | 0.000 Mbps | 02:00:00 | 4% | 11.09 GB |
Formula Used
Total bitrate = video bitrate + audio bitrate + subtitle bitrate.
Adjusted bitrate = total bitrate × (1 + overhead %) × (1 + safety margin %).
Total bits = adjusted bitrate × duration in seconds.
Total bytes = total bits ÷ 8.
Video size = total bytes converted into MB, GB, MiB, or GiB.
Use decimal units for storage marketing. Use binary units for system reporting.
How to Use This Calculator
- Enter the video bitrate value.
- Add audio and subtitle bitrates, if needed.
- Select the bitrate unit carefully.
- Enter hours, minutes, and seconds.
- Add overhead for container packaging.
- Add a safety margin for planning.
- Choose the output size unit.
- Click calculate to view storage estimates.
Frequently Asked Questions
1. What does this calculator estimate?
It estimates final video file size from bitrate, duration, overhead, and copy count. It combines video, audio, and subtitle streams before converting the result into storage units.
2. Why does overhead matter?
Containers add headers, indexes, and packaging data. That extra information slightly increases final size, especially across long recordings or many exported files.
3. What is the difference between MB and MiB?
MB uses powers of 1000. MiB uses powers of 1024. Storage vendors often advertise decimal units, while operating systems frequently report binary units.
4. Should audio bitrate always be included?
Yes, if audio exists in the file. Ignoring audio can understate size, particularly for podcasts, lectures, interviews, and long training videos.
5. Can I use this for live streaming planning?
Yes. It helps estimate how much data a stream generates over time. That is useful for bandwidth budgets, archives, and transfer planning.
6. Why add a safety margin?
A safety margin helps reserve extra space for metadata changes, muxing variations, unexpected bitrate spikes, or future duplicates in delivery workflows.
7. Does variable bitrate affect accuracy?
Yes. Variable bitrate content changes throughout playback. This tool is strongest when you use the average bitrate from your encoder or source analysis.
8. Is this calculator useful for backups?
Yes. It helps estimate archive growth, compare storage options, and plan how much space repeated exports or mirrored copies will consume.