Video File Size Calculator
See how big a video file will be from its length and bitrate. Useful for planning storage before you export or record.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Bitrate is the number of megabits used each second. Multiply it by the length in seconds, then divide by eight to get megabytes.
Divide megabytes by 1000 for gigabytes. A higher bitrate looks sharper but makes a bigger file.
Worked example
A 10 minute video at 8 Mbps comes to about 0.6 GB, which is 600 MB.
Questions
Where do I find the bitrate?
Your camera, editor or export settings show it, often in Mbps. Use the average bitrate if it is listed.
Is a constant bitrate the same as variable?
No. A variable bitrate changes with the scene, so the real file can be a little smaller or bigger than this estimate.
Why is my file bigger than the estimate?
Audio, subtitles and container overhead add a bit on top of the video stream.
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