D7
Reviewed for accuracy · Maintained by Justin Evans
D7 highlighted — use the view toggle to see all 88 keys.
Piano key
78 of 88
Octave
7
Frequency
2349.32 Hz
MIDI number
98
Key color
White key
Pitch class
D · C## · Ebb
What is D7?
D7 is the D in octave 7 — the 78th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 2349.32 Hz. It sits 38 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) 3 octaves to reach octave 7, then step to D.
Every octave doubles the frequency: the D one octave up sounds at 4698.64 Hz and the one below at 1174.66 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: