F♯ (musical note)

F♯ (eff-sharp or 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 F♯4) is approximately 369.994 Hz. See pitch (music) for a discussion of historical variations in frequency.

Designation by octave

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz)
F♯-1 F♯͵͵͵ or ͵͵͵F♯ or FFFF♯ (-uF♯) Subsubcontra 11.562
F♯0 F♯͵͵ or ͵͵F♯ or FFF♯ (-vF♯) Subcontra 23.125
F♯1 F♯͵ or ͵F♯ or FF♯ (-wF♯) Contra 46.249
F♯2 F♯ (-xF♯) Great 92.499
F♯3 f♯ (-yF♯) Small 184.997
F♯4 f♯′ (zF♯) One-lined 369.994
F♯5 f♯′′ (yF♯) Two-lined 739.989
F♯6 f♯′′′ (xF♯) Three-lined 1479.978
F♯7 f♯′′′′ (wF♯) Four-lined 2959.955
F♯8 f♯′′′′′ (vF♯) Five-lined 5919.911
F♯9 f♯′′′′′′ (uF♯) Six-lined 11839.822
F♯10 f♯′′′′′′′ (tF♯) Seven-lined 23679.643

Scales

Common scales beginning on F♯

Diatonic scales

Jazz Melodic Minor

See also

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