G♯2 / A♭2
G♯2 highlighted — use the view toggle to see all 88 keys.
Piano key
24 of 88
Octave
2
Frequency
103.83 Hz
MIDI number
44
Key color
Black key
Pitch class
G#, Ab
What is G♯2?
G♯2 is the G♯ in octave 2 — the 24th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 103.83 Hz. It sits 16 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) 2 octaves to reach octave 2, then step to G♯.
Every octave doubles the frequency: the G♯ one octave up sounds at 207.66 Hz and the one below at 51.92 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: