D (musical note)

D (musical note)

D is a musical note a whole tone above C, and is known as Re within the solfege system.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D (D4) is approximately 293.665 Hz. See pitch for a discussion of historical variations in frequency.

Designation by octave

Scientific designation Helmholtz designation Octave name Frequency (Hz)
D-1 D͵͵͵ or ͵͵͵D Subsubcontra 9.177
D0 D͵͵ or ͵͵D Subcontra 18.354
D1 D͵ or ͵D Contra 36.708
D2 D Great 73.416
D3 d Small 146.832
D4 d′ One-lined 293.665
D5 d′′ Two-lined 587.33
D6 d′′′ Three-lined 1174.659
D7 d′′′′ Four-lined 2349.318
D8 d′′′′′ Five-lined 4698.636
D9 d′′′′′′ Six-lined 9397.273