D4
Reviewed for accuracy · Maintained by Justin Evans
D4 highlighted — use the view toggle to see all 88 keys.
Piano key
42 of 88
Octave
4
Frequency
293.66 Hz
MIDI number
62
Key color
White key
Pitch class
D · C## · Ebb
What is D4?
D4 is the D in octave 4 — the 42nd key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 293.66 Hz. It sits 2 half-steps above middle C (C4).
To find it, locate any group of two black keys: the white key just to their left is a C. Count up from middle C (C4) within the same octave to reach octave 4, then step to D.
Every octave doubles the frequency: the D one octave up sounds at 587.32 Hz and the one below at 146.83 Hz. The same piano key can be written as D, C##, Ebb depending on the musical context — same sound, different spelling.
Nearby notes
Every D on the keyboard: