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

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♯ semitone is approximately 369.994 Hz. See pitch (music) for a discussion of historical variations in frequency.

v • d • e Notes of the Chromatic Scale B♯/C · C♯/D♭ · D · D♯/ E♭ · E/F♭ · E♯/F · F♯/G♭ · G · G♯/A♭ · A · A♯/B♭ · B/C♭

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