F♯3 / G♭3
Reviewed for accuracy · Maintained by Justin Evans
F♯3 highlighted — use the view toggle to see all 88 keys.
Piano key
34 of 88
Octave
3
Frequency
185 Hz
MIDI number
54
Key color
Black key
Pitch class
F# · Gb · E##
What is F♯3?
F♯3 is the F♯ in octave 3 — the 34th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 185 Hz. It sits 6 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 F♯.
Every octave doubles the frequency: the F♯ one octave up sounds at 370 Hz and the one below at 92.5 Hz. The same piano key can be written as F#, Gb, E## depending on the musical context — same sound, different spelling.
Nearby notes
Every F♯ on the keyboard: