A♯6 / B♭6
Reviewed for accuracy · Maintained by Justin Evans
A♯6 highlighted — use the view toggle to see all 88 keys.
Piano key
74 of 88
Octave
6
Frequency
1864.66 Hz
MIDI number
94
Key color
Black key
Pitch class
A# · Bb · Cbb
What is A♯6?
A♯6 is the A♯ in octave 6 — the 74th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 1864.66 Hz. It sits 34 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 A♯.
Every octave doubles the frequency: the A♯ one octave up sounds at 3729.32 Hz and the one below at 932.33 Hz. The same piano key can be written as A#, Bb, Cbb depending on the musical context — same sound, different spelling.
Nearby notes
Every A♯ on the keyboard: