G♯3 / A♭3
Reviewed for accuracy · Maintained by Justin Evans
G♯3 highlighted — use the view toggle to see all 88 keys.
Piano key
36 of 88
Octave
3
Frequency
207.65 Hz
MIDI number
56
Key color
Black key
Pitch class
G# · Ab
What is G♯3?
G♯3 is the G♯ in octave 3 — the 36th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 207.65 Hz. It sits 4 half-steps below middle C (C4).
To find it, locate any group of two black keys: the white key just to their left is a C. Count down from middle C (C4) 1 octave to reach octave 3, then step to G♯.
Every octave doubles the frequency: the G♯ one octave up sounds at 415.3 Hz and the one below at 103.83 Hz. The same piano key can be written as G#, Ab depending on the musical context — same sound, different spelling.
Nearby notes
Every G♯ on the keyboard: