G♯5 / A♭5
G♯5 highlighted — use the view toggle to see all 88 keys.
Piano key
60 of 88
Octave
5
Frequency
830.61 Hz
MIDI number
80
Key color
Black key
Pitch class
G#, Ab
What is G♯5?
G♯5 is the G♯ in octave 5 — the 60th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 830.61 Hz. It sits 20 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) 1 octave to reach octave 5, then step to G♯.
Every octave doubles the frequency: the G♯ one octave up sounds at 1661.22 Hz and the one below at 415.31 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: