A4 = 440Hz
A4 = 442Hz
In the musical system, the equal temperament is a widely used tuning system. It divides an octave into
12equal semitones. The frequency ratio between adjacent semitones is a fixed value, approximately1.0594631, which isthe 12th root of 2. For example, if the frequency ofA4(the international standard pitch) is440Hz, then the frequency ofA#4(a semitone higher thanA) is approximately440Hz * 1.0594631 = 466.164Hz.Other less common reference pitches, such as
A4 = 432Hz,A4 = 444Hz, etc., can also be calculated independently according to this algorithm.
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