D6
D6 highlighted — use the view toggle to see all 88 keys.
Piano key
66 of 88
Octave
6
Frequency
1174.66 Hz
MIDI number
86
Key color
White key
Pitch class
D, C##, Ebb
What is D6?
D6 is the D in octave 6 — the 66th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 1174.66 Hz. It sits 26 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) 2 octaves to reach octave 6, then step to D.
Every octave doubles the frequency: the D one octave up sounds at 2349.32 Hz and the one below at 587.33 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: