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Audio File Size Calculator

Estimate an audio file's size from bitrate and length.

Calculated Output

File size (MB) 9.375

Formula: size = bitrate * duration * 60 / 8 / 1024

Step-by-Step Breakdown

1. Values used:

2. Bitrate = 320 kbps

3. Duration = 4

5. File size = 9.375MB

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The math behind it

size (MB) = bitrate (kbps) x seconds / 8 / 1024.

A 4-minute song at 320 kbps is about 9.4 MB.

What bitrate sounds good?

256-320 kbps for MP3 is near-transparent for most listeners.