128kbps Mp3(2.47 Mb) Review

This is generally considered the baseline or "standard" quality for digital audio. While highly optimized for saving storage space, it is a lossy format.

Are you trying to calculate the for a specific device? 128kbps mp3(2.47 MB)

What is the specific you are analyzing? (e.g., spoken word, electronic music, classic rock) This is generally considered the baseline or "standard"