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# F♯ (musical note)

F Sharp

F (F-sharp; also known as fa dièse or fi) is the seventh semitone of the solfège.

It lies a chromatic semitone above F and a diatonic semitone below G, thus being enharmonic to sol bémol or G (G-flat). However, in some temperaments, it is not the same as G. G is a major third below B, whereas F is a major third above D (a minor third below A).

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the F above middle C (or F4) is approximately 369.994 Hz. See pitch (music) for a discussion of historical variations in frequency.

## Designation by octave

Scientific designation Helmholtz designation Octave name Frequency (Hz)
F−1 F͵͵͵ or ͵͵͵F or FFFF Subsubcontra 11.562
F0 F͵͵ or ͵͵F or FFF Subcontra 23.125
F1 F͵ or ͵F or FF Contra 46.249
F2 F Great 92.499
F3 f Small 184.997
F4 f One-lined 369.994
F5 f′′ Two-lined 739.989
F6 f′′′ Three-lined 1479.978
F7 f′′′′ Four-lined 2959.955
F8 f′′′′′ Five-lined 5919.911
F9 f′′′′′′ Six-lined 11839.822
F10 f′′′′′′′ Seven-lined 23679.643

## Scales

### Diatonic scales

• F Ionian: F G A B C D E F
• F Dorian: F G A B C D E F
• F Phrygian: F G A B C D E F
• F Lydian: F G A B C D E F
• F Mixolydian: F G A B C D E F
• F Aeolian: F G A B C D E F
• F Locrian: F G A B C D E F