About the Video File Size Calculator
Video file size is almost entirely bitrate times duration — resolution and frame rate matter only because they drive the bitrate you need. Add the audio track and you have the whole picture, which is all you need to plan storage or an upload.
Also known as: video size calculator, mp4 file size, recording size calculator, footage storage.
How to use this calculator
- Enter video bitrate, audio bitrate, hours, minutes and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
bytes = (video bitrate + audio bitrate) × seconds ÷ 8
Worked example
Using the values pre-filled in the calculator above:
- Video bitrate = 8 Mbps
- Audio bitrate = 192 kbps
- Hours = 1
- Minutes = 30
- Seconds = 0
the calculator returns:
- File size: 5.15 GB
- In gigabytes: 5.1498
- Video track: 5.029 GB
- Audio track: 123.6 MB