Video Bitrate and File Size Calculator
Estimate video file size from duration, video bitrate, audio bitrate and a container/overhead allowance. This is useful when planning export sizes, storage and uploads.
How to use this calculator
- Enter duration in minutes, video bitrate in Mbps, audio bitrate in kbps and an overhead percentage.
- Check the labels and units before applying the result to a real task.
- Change one input at a time when comparing scenarios.
Formula and method
Size in bytes ≈ duration seconds × (video bits/s + audio bits/s) ÷ 8 × (1 + overhead%)
- Size in bytes ≈ duration seconds × (video bits/s + audio bits/s) ÷ 8 × (1 + overhead%)
- The result assumes average bitrates and decimal MB/GB. Variable-bitrate encoding, extra tracks, metadata and the container can change the actual file size.
Worked examples
Worked example
A 10-minute video at 8 Mbps video and 192 kbps audio with 5% overhead.
Estimated size is about 614.4 MB before exact container and variable-bitrate differences.
Estimated size is about 614.4 MB before exact container and variable-bitrate differences.
Understanding the result
Estimate video file size from duration, video bitrate, audio bitrate and a container/overhead allowance. This is useful when planning export sizes, storage and uploads.
The result assumes average bitrates and decimal MB/GB. Variable-bitrate encoding, extra tracks, metadata and the container can change the actual file size.
Important notes
The result assumes average bitrates and decimal MB/GB. Variable-bitrate encoding, extra tracks, metadata and the container can change the actual file size.
Displayed values are rounded for readability; retain appropriate precision when continuing a calculation.
Frequently asked questions
Why does higher bitrate increase file size?
Bitrate is the amount of encoded data per second. For the same duration, more bits per second means more bytes in the finished file.
Is the output exact for variable bitrate video?
No. Use the average bitrate for an estimate; a variable-bitrate file can differ based on scene complexity and encoder settings.
Are MB and MiB identical?
No. This tool uses decimal MB (1,000,000 bytes) and GB (1,000,000,000 bytes), which differ from binary MiB and GiB.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.