Practical focus
Use this calculator to estimate audio file size from bitrate, duration, format, and channels before exporting or compressing.
Private browser-based audio compression
Audio File Size Calculator
Estimate MP3, AAC, OGG, and WAV file sizes from practical audio settings.
Your audio is compressed locally in your browser. Files are not uploaded to a server.
MP3 / WAV / M4A / AAC / OGG / FLAC inputMP3M4A / AACOGG
Estimated file size-
Common bitrate reference
- 64 kbps: voice and lecture recordings
- 128 kbps: general music and mixed audio
- 192 kbps: higher quality music
Quick tips
- Formula for compressed audio: file size MB ~= bitrate kbps x duration seconds / 8192.
- WAV uses a different PCM-based calculation.
- Lower bitrate, shorter duration, mono, and efficient formats reduce size.
How to use
- Enter the duration and bitrate for MP3, AAC, or OGG estimates.
- Choose the relevant format so the calculator can show a practical size estimate.
- For WAV, account for sample rate, bit depth, channels, and duration rather than only lossy bitrate.
- Use the result to decide whether to compress, change format, or target a specific MB page.
Recommended settings
| Bitrate | Approximate use |
|---|---|
| 64 kbps | Voice and lectures |
| 96 kbps | Voice or podcast |
| 128 kbps | General MP3 sharing |
| 192 kbps | Better music copy |
| WAV PCM | Editing master, much larger |
Supported formats
The calculator is useful for MP3, AAC/M4A, OGG, and WAV-style planning.
For exact output, compression still depends on encoder and container overhead.
Quality vs file size
Compressed audio estimate: file size MB ~= bitrate kbps x duration seconds / 8192.
WAV is much larger because it stores PCM samples based on sample rate, bit depth, channels, and duration, not a compact lossy bitrate.
Privacy and local processing
The calculator works from typed values and does not need an audio upload.
Compression pages process selected files locally in the browser.
Things to watch
- Actual encoded size can differ from calculator output.
- Do not compare WAV and MP3 only by extension; their storage models are different.
FAQ
How do I estimate audio file size?
For bitrate-based formats, use file size MB ~= bitrate kbps x duration seconds / 8192.
Why is WAV much larger than MP3?
WAV often stores uncompressed PCM samples, while MP3 uses lossy encoding to store fewer bits.
How much space does 128 kbps audio use?
Roughly 0.94 MB per minute before small container differences.
Why is the actual file size different?
Metadata, VBR encoding, format overhead, and encoder choices can change the result.
How can I reduce estimated file size?
Lower bitrate, shorten the audio, use mono for voice, or choose a more efficient compressed format.