Pitches and Frequencies

The following table shows the correspondence between pitch name variables, key numbers, and the frequencies (in Hz) that they represent.

Key number constants, not explicitly listed here, are the same as pitch name variables, but with an appended “k.”

The rightmost column, Upper Limit, shows the highest frequency (inclusive) that corresponds to the key number. A key number's lowest frequency (non-inclusive) is the upper limit of the previous key number.