F2
Reviewed for accuracy · Maintained by Justin Evans
F2 highlighted — use the view toggle to see all 88 keys.
Piano key
21 of 88
Octave
2
Frequency
87.31 Hz
MIDI number
41
Key color
White key
Pitch class
F · E# · Gbb
What is F2?
F2 is the F in octave 2 — the 21st key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 87.31 Hz. It sits 19 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 F.
Every octave doubles the frequency: the F one octave up sounds at 174.62 Hz and the one below at 43.66 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: