When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of Middle F (F4) is approximately 349.228 Hz. See pitch (music) for a discussion of historical variations in frequency.
|Scientific designation||Helmholtz designation||Octave name||Frequency (Hz)|
|F-1||F or F or FFFF||Octocontra||10.913|
|F0||F or F or FFF||Subcontra||21.827|
|F1||F? or ?F or FF||Contra||43.654|
E♯ (Ger. Eis) is a common enharmonic equivalent of F, but is not regarded as the same note. E♯ is commonly found before F♯ in the same measure in pieces where F♯ is in the key signature, in order to represent a diatonic, rather than a chromatic semitone; writing an F♮ with a following F♯ is regarded as a chromatic alteration of one scale degree. Though E♯ and F♮ sound the same in any 12-tone temperament, other tunings may define them as distinct pitches.