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{{wikipedia|MP3#Bit rate|Bit rate|Average bitrate}}

The '''bit rate''' or '''bitrate''' of media measures the bits used to store the data per second (kilobits per second, kbit/s or kbps). It is formally defined as the product of (bits per sample) × ([[sample rate|samples per second]]).

A '''constant bit rate''' or '''constant bitrate''' (CBR) is a bit rate that does not change.

A '''variable bit rate''' or '''variable bitrate''' (VBR) is a bit rate that varies depending upon the complexity of the data.

An '''average bit rate''' or '''average bitrate''' (ABR) may refer to either <code><var>total bits</var> &divide; <var>time</var></code> or [https://wiki.hydrogenaud.io/index.php?title=Average_Bitrate a form of VBR].

Some common bit rates for [[mp3]] files are 128 kbit/s (standard), 192 kbit/s (medium quality), 256 kbit/s (high quality) and 320 kbit/s (highest quality).<br>
A low bit rate (below about 128 kbps) makes for poor audio quality.

[[Category:Glossary]]