Free Video Tools
Video Bitrate Calculator
Calculate the average video bitrate available inside a target file-size limit.
What this tool does
Work backward from a file-size limit to an average bitrate.
The calculator converts the target megabytes into a total data rate across the chosen duration, then reserves the selected audio bitrate.
The remaining value is an approximate average video bitrate; strict upload limits need extra headroom for container overhead and encoding variation.
Use the tool
Calculate a target video bitrate
Enter the file limit, duration, and audio bitrate to estimate the available video bitrate.
File limit and duration
Calculate the average video bitrate that fits after reserving space for audio.
Available video bitrate
8.70 Mbps
- Total data rate
- 8.89 Mbps
- Reserved for audio
- 192 kbps
Allow additional headroom for container overhead and variable-bitrate peaks before using a strict upload limit.
How to use it
Three quick steps
- 1Enter the maximum file size and exact duration.
- 2Reserve the intended audio bitrate.
- 3Encode below the calculated video rate, leaving headroom, then verify the actual file.
Worked example
Fit a 90-second video under 100 MB
Reserve 192 kbps for audio and calculate the remaining average video rate.
FAQ
Questions about the video bitrate calculator
Practical details about using the tool and understanding its result.
Keep working
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