Free Audio Tools
Audio File-size Calculator
Estimate compressed audio storage from duration and average encoded bitrate.
What this tool does
Estimate compressed audio storage before export.
The calculator multiplies duration by average encoded bitrate and converts the result into megabytes or gigabytes.
The result is approximate because containers, artwork, metadata, and variable bitrate add variation.
Use the tool
Estimate audio file size
Enter duration and average bitrate or choose a common bitrate preset.
Duration and encoded bitrate
Estimated audio size
43.20 MB
2700 seconds at 128 kbps
Estimate excludes container overhead, artwork, metadata, extra streams, and variable-bitrate variation.
How to use it
Three quick steps
- 1Enter the final duration.
- 2Set the expected average bitrate.
- 3Plan storage or transfer with headroom, then measure the actual export.
Worked example
Estimate a podcast episode
Calculate 45 minutes at 128 kbps.
FAQ
Questions about the audio file-size calculator
Practical details about using the tool and understanding its result.
Keep working
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