Audio File Size Calculator
Estimate audio file size from duration and bitrate for podcasts, voice notes, extracted audio, and media publishing.
Ready to use
Browser-side · no account · results stay on this page
Estimated file size
28.13 MB
Per minute
960 KB
Per hour
56.25 MB
Use this calculator to estimate how large an audio export will be before encoding or uploading.
It is useful for podcast drafts, voice notes, audio extracted from video, and bandwidth planning.
Final duration
Use the edited duration after trimming silence.
Target bitrate
Use the bitrate you plan to export, such as 96, 128, or 192 kbps.
Upload limit
Compare the estimate against platform, email, or LMS size limits.
Example
A 30-minute audio file at 128 kbps is roughly 28 MB.
Assumption
The selected bitrate is the average encoded bitrate.
Limitation
Variable bitrate exports, metadata, cover art, and container overhead can change final size.
Podcasts
Estimate episode size before upload.
Voice notes
Plan delivery size for spoken audio.
Video audio
Estimate extracted audio size.
Bandwidth
Estimate transfer size for training or course media.
How is audio file size estimated?
The tool multiplies duration by bitrate and converts bits to bytes. It is a practical estimate, not a file inspection.
Does the format matter?
Format and encoder behavior can affect the final file, but bitrate and duration are the main planning inputs.
Can I use this for MP3, M4A, AAC, or Opus?
Yes, if you know the target bitrate. The estimate is useful across common audio formats.
How is the estimate processed?
This calculator uses typed values only and performs the file-size math in the browser.
How is audio file size estimated?
The tool multiplies duration by bitrate and converts bits to bytes. It is a practical estimate, not a file inspection.
Does the format matter?
Format and encoder behavior can affect the final file, but bitrate and duration are the main planning inputs.
Can I use this for MP3, M4A, AAC, or Opus?
Yes, if you know the target bitrate. The estimate is useful across common audio formats.
How is the estimate processed?
This calculator uses typed values only and performs the file-size math in the browser.
Suggested workflow
Audio planning workflow
Estimate audio size, extract audio if needed, then prepare video or audio assets.