Audio File Size Calculator

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

File size (MB) 9.375

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

Step-by-step with your numbers:
1. Values used:
2. Bitrate = 320 kbps
3. Duration = 4
4.
5. File size = 9.375MB
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Audio file size scales with bitrate and track length.

The math behind it

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

Worked example

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

FAQ

What bitrate sounds good?

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