Audio File Size Calculator
Estimate audio file sizes based on bitrate, duration, and channel configuration. No file upload needed — pure math, instant results. 100% client-side — nothing leaves your browser.
How to Use the Audio File Size Calculator
- Choose a mode — "Calculate file size" or "Find required bitrate".
- Select a preset — click a format preset (MP3 128kbps, WAV, etc.) to auto-fill values.
- Adjust parameters — bitrate, channels (mono/stereo/surround), and duration.
- Read the result — instant file size estimate with common format comparisons.
Why Use This Calculator
Planning storage, bandwidth, or upload limits for audio files? This calculator helps you estimate file sizes before encoding, compare format efficiency, and find the right bitrate to hit a target file size. No file upload needed — it is pure math, instant, and private.
Frequently Asked Questions
File size = (bitrate in kbps × 1000 / 8) × duration in seconds. For example, a 3-minute stereo MP3 at 128kbps is roughly (128 × 1000 / 8) × 180 = 2,880,000 bytes ≈ 2.75 MB.
The calculation provides a close estimate but excludes small container/metadata overhead (typically a few KB for headers). Actual files may vary by 1-2%.