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About F♯8
F♯8 / G♭8 has a frequency of 5.92 kHz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 114, outside the range of a standard piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so F♯8 is 45 semitones above A4: f = 440 × 2^((114 − 69) / 12) = 5,919.91 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
F♯8 and G♭8 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♯8 frequency in different tunings
| Tuning reference | F♯8 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 5.92 kHz |
| A4 = 442 Hz (many European orchestras) | 5.947 kHz |
| A4 = 443 Hz (Berlin, Vienna) | 5.96 kHz |
| A4 = 435 Hz (French diapason normal, 1859) | 5.853 kHz |
| A4 = 432 Hz (alternative tuning) | 5.812 kHz |
| A4 = 415 Hz (Baroque pitch) | 5.584 kHz |
| C4 = 256 Hz (scientific pitch) | 5.793 kHz |
Intervals from F♯8
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | G8 | 6.272 kHz | 16:15 |
| Major second | G♯8 | 6.645 kHz | 9:8 |
| Minor third | A8 | 7.04 kHz | 6:5 |
| Major third | A♯8 | 7.459 kHz | 5:4 |
| Perfect fourth | B8 | 7.902 kHz | 4:3 |
| Tritone | C9 | 8.372 kHz | 45:32 |
| Perfect fifth | C♯9 | 8.87 kHz | 3:2 |
| Minor sixth | D9 | 9.397 kHz | 8:5 |
| Major sixth | D♯9 | 9.956 kHz | 5:3 |
| Minor seventh | E9 | 10.548 kHz | 9:5 |
| Major seventh | F9 | 11.175 kHz | 15:8 |
| Octave | F♯9 | 11.84 kHz | 2:1 |
Frequently asked questions
What is the frequency of F♯8?
F♯8 is 5.92 kHz when A4 = 440 Hz (5.812 kHz if A4 = 432 Hz).
What MIDI number is F♯8?
F♯8 is MIDI note number 114.
Is F♯8 on a piano?
No – a standard 88-key piano runs from A0 to C8, so F♯8 is outside its range.