Online Tool Store
Audio Bitrate Estimator
Estimate audio file size from duration and bitrate, compare common 128, 192, and 320 kbps presets, and calculate the result in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
- Duration
- —
- Estimated file size
- —
- Bitrate used
- —
| Bitrate | Estimated size |
|---|
How it works
- Enter the source values supported by this tool.
- Adjust the settings and review the result shown by the widget.
- Use the available copy, download, print, or export control.
The formula
file size (bytes) = bitrate (kbps) × 1000 × duration (seconds) ÷ 8
Example: a 45-minute (2,700 second) episode at 192 kbps ≈ 192,000 × 2,700 ÷ 8 ≈ 64.8 MB.
FAQ
What does this tool do?
Estimate audio file size from duration and bitrate, compare common 128, 192, and 320 kbps presets, and calculate the result in your browser..
Does it run in my browser?
Yes. The current widget runs locally in your browser without an account.
Should I verify the result?
Yes. Treat it as a practical estimate or preview and verify it against your requirements.
How we compare
| Feature | Online Tool Store | Manual math | Encoder software estimate |
|---|---|---|---|
| Instant multi-bitrate comparison table | ✓ | ✗ | One bitrate at a time |
| No file upload or encoding needed | ✓ | ✓ | ✗ |
| Free, instant | ✓ | Error-prone by hand | ✓ |
If you're planning storage or upload limits before recording or encoding, this estimator gets you a size range across common bitrates without touching any actual audio file.