D♯4 / E♭4
Reviewed for accuracy · Maintained by Justin Evans
D♯4 highlighted — use the view toggle to see all 88 keys.
Piano key
43 of 88
Octave
4
Frequency
311.13 Hz
MIDI number
63
Key color
Black key
Pitch class
D# · Eb · Fbb
What is D♯4?
D♯4 is the D♯ in octave 4 — the 43rd key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 311.13 Hz. It sits 3 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 622.26 Hz and the one below at 155.57 Hz. The same piano key can be written as D#, Eb, Fbb depending on the musical context — same sound, different spelling.
Nearby notes
Every D♯ on the keyboard: