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F♯ (F-sharp; also known asfa dièse orfi) is the seventhsemitone of thesolfège.
It lies achromatic semitone aboveF and adiatonic semitone belowG, thus beingenharmonic tosol bémol orG♭ (G-flat) in12 equal temperament. However, in other temperaments, such asquarter-comma meantone, it is not the same as G♭. G♭ is amajor third below B♭, whereas F♯ is a major third above D (a minor third below A). Another enharmonic note is E
(E-double sharp).[1]
When calculated inequal temperament with a reference ofA abovemiddle C as 440Hz, thefrequency of the F♯ above middle C (or F♯4) is approximately 369.994Hz.[2] Seepitch (music) for a discussion of historical variations in frequency.
| Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) | MIDI note number |
|---|---|---|---|---|
| F♯−1 | F♯͵͵͵ or ͵͵͵F♯ or FFFF♯ | Subsubcontra | 11.562 | 6 |
| F♯0 | F♯͵͵ or ͵͵F♯ or FFF♯ | Subcontra | 23.125 | 18 |
| F♯1 | F♯͵ or ͵F♯ or FF♯ | Contra | 46.249 | 30 |
| F♯2 | F♯ | Great | 92.499 | 42 |
| F♯3 | f♯ | Small | 184.997 | 54 |
| F♯4 | f♯′ | One-lined | 369.994 | 66 |
| F♯5 | f♯′′ | Two-lined | 739.989 | 78 |
| F♯6 | f♯′′′ | Three-lined | 1479.978 | 90 |
| F♯7 | f♯′′′′ | Four-lined | 2959.955 | 102 |
| F♯8 | f♯′′′′′ | Five-lined | 5919.911 | 114 |
| F♯9 | f♯′′′′′′ | Six-lined | 11839.822 | 126 |
| F♯10 | f♯′′′′′′′ | Seven-lined | 23679.643 | N/A |
D♯ E♯ F♯