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About F♯5
F♯5 / G♭5 has a frequency of 739.99 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 78 and key number 58 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so F♯5 is 9 semitones above A4: f = 440 × 2^((78 − 69) / 12) = 739.99 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
F♯5 and G♭5 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♯5 frequency in different tunings
| Tuning reference | F♯5 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 739.99 Hz |
| A4 = 442 Hz (many European orchestras) | 743.35 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 745.03 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 731.58 Hz |
| A4 = 432 Hz (alternative tuning) | 726.53 Hz |
| A4 = 415 Hz (Baroque pitch) | 697.94 Hz |
| C4 = 256 Hz (scientific pitch) | 724.08 Hz |
Where to play F♯5 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 2nd string (B), fret 19
- 1st string (high E), fret 14
Intervals from F♯5
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | G5 | 783.99 Hz | 16:15 |
| Major second | G♯5 | 830.61 Hz | 9:8 |
| Minor third | A5 | 880 Hz | 6:5 |
| Major third | A♯5 | 932.33 Hz | 5:4 |
| Perfect fourth | B5 | 987.77 Hz | 4:3 |
| Tritone | C6 | 1.047 kHz | 45:32 |
| Perfect fifth | C♯6 | 1.109 kHz | 3:2 |
| Minor sixth | D6 | 1.175 kHz | 8:5 |
| Major sixth | D♯6 | 1.245 kHz | 5:3 |
| Minor seventh | E6 | 1.319 kHz | 9:5 |
| Major seventh | F6 | 1.397 kHz | 15:8 |
| Octave | F♯6 | 1.48 kHz | 2:1 |
Instruments and voices that can play F♯5
Frequently asked questions
What is the frequency of F♯5?
F♯5 is 739.99 Hz when A4 = 440 Hz (726.53 Hz if A4 = 432 Hz).
What MIDI number is F♯5?
F♯5 is MIDI note number 78.
Is F♯5 on a piano?
Yes – it is key 58 of 88.
Where is F♯5 on the guitar?
In standard tuning: 2nd string (B), fret 19; 1st string (high E), fret 14.