C♯6 / D♭6
Reviewed for accuracy · Maintained by Justin Evans
C♯6 highlighted — use the view toggle to see all 88 keys.
Piano key
65 of 88
Octave
6
Frequency
1108.73 Hz
MIDI number
85
Key color
Black key
Pitch class
C# · Db · B##
What is C♯6?
C♯6 is the C♯ in octave 6 — the 65th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 1108.73 Hz. It sits 25 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 C♯.
Every octave doubles the frequency: the C♯ one octave up sounds at 2217.46 Hz and the one below at 554.37 Hz. The same piano key can be written as C#, Db, B## depending on the musical context — same sound, different spelling.
Nearby notes
Every C♯ on the keyboard: