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About F♯2
F♯2 / G♭2 has a frequency of 92.5 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 42 and key number 22 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so F♯2 is 27 semitones below A4: f = 440 × 2^((42 − 69) / 12) = 92.50 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
F♯2 and G♭2 are enharmonic: on a piano or in equal temperament they are the same key and the same frequency, but they are spelled differently depending on the key signature.
F♯2 frequency in different tunings
| Tuning reference | F♯2 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 92.5 Hz |
| A4 = 442 Hz (many European orchestras) | 92.92 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 93.13 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 91.45 Hz |
| A4 = 432 Hz (alternative tuning) | 90.82 Hz |
| A4 = 415 Hz (Baroque pitch) | 87.24 Hz |
| C4 = 256 Hz (scientific pitch) | 90.51 Hz |
Where to play F♯2 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 6th string (low E), fret 2
Intervals from F♯2
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | G2 | 98 Hz | 16:15 |
| Major second | G♯2 | 103.83 Hz | 9:8 |
| Minor third | A2 | 110 Hz | 6:5 |
| Major third | A♯2 | 116.54 Hz | 5:4 |
| Perfect fourth | B2 | 123.47 Hz | 4:3 |
| Tritone | C3 | 130.81 Hz | 45:32 |
| Perfect fifth | C♯3 | 138.59 Hz | 3:2 |
| Minor sixth | D3 | 146.83 Hz | 8:5 |
| Major sixth | D♯3 | 155.56 Hz | 5:3 |
| Minor seventh | E3 | 164.81 Hz | 9:5 |
| Major seventh | F3 | 174.61 Hz | 15:8 |
| Octave | F♯3 | 185 Hz | 2:1 |
Instruments and voices that can play F♯2
Frequently asked questions
What is the frequency of F♯2?
F♯2 is 92.5 Hz when A4 = 440 Hz (90.82 Hz if A4 = 432 Hz).
What MIDI number is F♯2?
F♯2 is MIDI note number 42.
Is F♯2 on a piano?
Yes – it is key 22 of 88.
Where is F♯2 on the guitar?
In standard tuning: 6th string (low E), fret 2.