F3
F3 highlighted — use the view toggle to see all 88 keys.
Piano key
33 of 88
Octave
3
Frequency
174.61 Hz
MIDI number
53
Key color
White key
Pitch class
F, E#, Gbb
What is F3?
F3 is the F in octave 3 — the 33rd key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 174.61 Hz. It sits 7 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 349.22 Hz and the one below at 87.31 Hz. The same piano key can be written as F, E#, Gbb depending on the musical context — same sound, different spelling.
Nearby notes
Every F on the keyboard: