Audio Bitrate Calculator
Find an audio file's average kbps or estimate its size at 128, 192 or 320 kbps.
Audio quality and size
An audio file's size depends directly on its bitrate and duration. With the Audio Bitrate Calculator you can find the average bitrate of an existing file or work out in advance how much space a podcast episode, song or audiobook will take at a given quality.
Common bitrates
- 64–96 kbps: economical for speech and audiobooks
- 128 kbps: a common standard for podcasts
- 192–256 kbps: good-quality music
- 320 kbps: the highest MP3 quality
Example
An hour of audio at 128 kbps takes about 57.6 MB; at 320 kbps about 144 MB. Calculations happen in your browser.
How to use Audio Bitrate Calculator
- Choose the calculation mode.
- Enter the file size or bitrate and duration.
- The result updates instantly.
- Use the value in your export settings.
Why use this tool?
Helps you pick the right quality for podcast hosting quotas, email attachment limits and device storage.
FAQ
How much space does an hour at 128 kbps take?
About 57.6 MB (128,000 bits × 3,600 seconds ÷ 8).
What bitrate is recommended for podcasts?
Mono 64–96 kbps works for speech-only shows; stereo 128 kbps is common for shows with music.
What is the bitrate of a WAV file?
CD-quality stereo WAV is about 1411 kbps, which is why it's much larger than MP3.
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