F♯1 / G♭1
Reviewed for accuracy · Maintained by Justin Evans
F♯1 highlighted — use the view toggle to see all 88 keys.
Piano key
10 of 88
Octave
1
Frequency
46.25 Hz
MIDI number
30
Key color
Black key
Pitch class
F# · Gb · E##
What is F♯1?
F♯1 is the F♯ in octave 1 — the 10th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 46.25 Hz. It sits 30 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) 3 octaves to reach octave 1, then step to F♯.
Every octave doubles the frequency: the F♯ one octave up sounds at 92.5 Hz and the one below at 23.13 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: