F5
F5 highlighted — use the view toggle to see all 88 keys.
Piano key
57 of 88
Octave
5
Frequency
698.46 Hz
MIDI number
77
Key color
White key
Pitch class
F, E#, Gbb
What is F5?
F5 is the F in octave 5 — the 57th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 698.46 Hz. It sits 17 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 F.
Every octave doubles the frequency: the F one octave up sounds at 1396.92 Hz and the one below at 349.23 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: