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Free Audio File Size Calculator
Enter the length of your episode and pick a format to see the file size, plus monthly and yearly storage. Free and instant.
How to use the audio file size calculator
- Enter the episode length in minutes.
- Choose a format and bitrate, such as MP3 128 kbps stereo.
- Enter how many episodes you publish each month.
- Read the file size and compare every format in the table.
About this tool
File size depends on bitrate and length. An MP3 at 128 kbps uses about 0.96 megabytes per minute, while uncompressed 44.1 kHz 16-bit stereo WAV uses about 10.6 megabytes per minute.
Podcast hosts often limit monthly uploads or storage, so knowing your size per episode helps you pick a plan and a bitrate. Voice shows are commonly published as MP3, and many producers keep the WAV master for editing.
Frequently asked questions
How big is one hour of MP3 audio?
At 128 kbps one hour is about 57.6 megabytes. At 64 kbps mono it is about 28.8 megabytes.
What is the difference between MP3 and WAV size?
WAV is uncompressed, so it is much larger. Stereo WAV at 44.1 kHz and 16-bit is about 1,411 kbps.
Is the result exact?
It is very close for constant bitrate files. Variable bitrate files and tags change the size slightly.
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