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About F♯3
F♯3 / G♭3 has a frequency of 185 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 54 and key number 34 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so F♯3 is 15 semitones below A4: f = 440 × 2^((54 − 69) / 12) = 185.00 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
F♯3 and G♭3 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♯3 frequency in different tunings
| Tuning reference | F♯3 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 185 Hz |
| A4 = 442 Hz (many European orchestras) | 185.84 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 186.26 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 182.89 Hz |
| A4 = 432 Hz (alternative tuning) | 181.63 Hz |
| A4 = 415 Hz (Baroque pitch) | 174.49 Hz |
| C4 = 256 Hz (scientific pitch) | 181.02 Hz |
Where to play F♯3 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 6th string (low E), fret 14
- 5th string (A), fret 9
- 4th string (D), fret 4
Intervals from F♯3
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | G3 | 196 Hz | 16:15 |
| Major second | G♯3 | 207.65 Hz | 9:8 |
| Minor third | A3 | 220 Hz | 6:5 |
| Major third | A♯3 | 233.08 Hz | 5:4 |
| Perfect fourth | B3 | 246.94 Hz | 4:3 |
| Tritone | C4 | 261.63 Hz | 45:32 |
| Perfect fifth | C♯4 | 277.18 Hz | 3:2 |
| Minor sixth | D4 | 293.66 Hz | 8:5 |
| Major sixth | D♯4 | 311.13 Hz | 5:3 |
| Minor seventh | E4 | 329.63 Hz | 9:5 |
| Major seventh | F4 | 349.23 Hz | 15:8 |
| Octave | F♯4 | 369.99 Hz | 2:1 |
Instruments and voices that can play F♯3
Frequently asked questions
What is the frequency of F♯3?
F♯3 is 185 Hz when A4 = 440 Hz (181.63 Hz if A4 = 432 Hz).
What MIDI number is F♯3?
F♯3 is MIDI note number 54.
Is F♯3 on a piano?
Yes – it is key 34 of 88.
Where is F♯3 on the guitar?
In standard tuning: 6th string (low E), fret 14; 5th string (A), fret 9; 4th string (D), fret 4.