What Is an Audio File Size Calculator?
Audio file size depends entirely on how the audio is encoded. Compressed formats like MP3 and AAC store audio at a fixed bitrate, while uncompressed formats like WAV store every individual sample at full resolution. This calculator estimates the resulting file size either way, so you can plan storage space, upload limits, or export settings before you render a file.
It's useful for podcasters checking hosting limits, musicians archiving multitrack sessions, and anyone deciding between file quality and storage space.
How to Read Your Results
Estimated File Size
The primary result matches whichever format type you selected — compressed or uncompressed — based on the settings you entered for that format.
Compressed (MP3-style) Size
What the same duration would take up as an MP3 or AAC file at your entered bitrate, regardless of which format type is selected — useful for comparing the two side by side.
Uncompressed (WAV-style) Size
What the same duration would take up as a raw PCM/WAV file at your entered sample rate, bit depth and channel count.
Real-World Example
A 3.5-minute song exported both ways:
| Format | Settings | File Size |
|---|---|---|
| MP3 | 192 kbps | ≈5.04 MB |
| WAV | 44,100 Hz / 16-bit / stereo | ≈37.04 MB |
The uncompressed WAV file is roughly 7 times larger than the 192 kbps MP3 for the exact same song — the tradeoff between full-resolution audio and manageable file size.
Tips for Managing Audio File Size
- Use 128–192 kbps MP3/AAC for casual listening or streaming to save the most space.
- Use 320 kbps or a lossless format when audio quality matters more than file size, like a master recording.
- Mono halves file size instantly compared to stereo, and is standard for spoken-word podcasts.
- Higher sample rates (96/192 kHz) are mainly useful for production and mixing — most listeners can't hear the difference from 44.1/48 kHz on a finished mix.
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Last updated: August 2026 · Reviewed by: Simple Calculator Tools Editorial Team