What This Tool Does

The Audio File Size Estimator calculates the approximate size of an audio file based on the duration, sample rate, bit depth, channel count, and bitrate.

It supports both uncompressed formats like WAV and PCM, and compressed formats like MP3 and AAC. The tool provides results in bytes, kilobytes, megabytes, and gigabytes.

How It Works (The Math)

For uncompressed audio, the formula is:

(bytes) = Duration × Sample Rate × Bit Depth × Channels ÷ 8

This calculates the number of bits needed, then divides by 8 to convert to bytes.

For compressed audio, the formula is:

(bytes) = Duration × Bitrate × 1000 ÷ 8

Here, bitrate is in kilobits per second (kbps), so it’s multiplied by 1000 and then divided by 8 to convert to bytes.

How to Use It

1. Choose Compressed or Uncompressed using the toggle buttons.
2. Enter the audio duration in hours, minutes, seconds, and milliseconds.
3. For uncompressed audio, choose the sample rate, bit depth, and channel count.
4. For compressed audio, simply enter the bitrate in kbps.
5. Click Calculate to see estimated file sizes in multiple units.
6. Use Reset to clear everything.
7. Keyboard shortcuts:
8. Enter = Calculate
9. Escape = Reset

What It’s Used For

This tool is great for podcasters, musicians, mixing engineers, or anyone preparing audio files for upload, storage, or delivery.

It helps estimate space needed before bouncing a mix, planning streaming bitrates, or checking if your files will fit into storage/media limits.