D♯2 / E♭2
Reviewed for accuracy · Maintained by Justin Evans
D♯2 highlighted — use the view toggle to see all 88 keys.
Piano key
19 of 88
Octave
2
Frequency
77.78 Hz
MIDI number
39
Key color
Black key
Pitch class
D# · Eb · Fbb
What is D♯2?
D♯2 is the D♯ in octave 2 — the 19th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 77.78 Hz. It sits 21 half-steps below middle C (C4).
To find it, locate any group of two black keys: the white key just to their left is a C. Count down from middle C (C4) 2 octaves to reach octave 2, then step to D♯.
Every octave doubles the frequency: the D♯ one octave up sounds at 155.56 Hz and the one below at 38.89 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: