C8
The highest note on the piano
Reviewed for accuracy · Maintained by Justin Evans
C8 highlighted — use the view toggle to see all 88 keys.
Piano key
88 of 88
Octave
8
Frequency
4186.01 Hz
MIDI number
108
Key color
White key
Pitch class
C · B# · Dbb
What is C8?
C8 is the C in octave 8 — the 88th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 4186.01 Hz. It sits 48 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) 4 octaves to reach octave 8, then step to C.
Every octave doubles the frequency: the C one octave up sounds at 8372.02 Hz and the one below at 2093.01 Hz. The same piano key can be written as C, B#, Dbb depending on the musical context — same sound, different spelling.
Nearby notes
← B7C8
Every C on the keyboard: