F♯9 / G♭9
11,839.822Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
126
Piano key
—
Octave
9
Frequency
11,839.822 Hz
Period
0.0845 ms
Wavelength
0.029 m
Pitch class
F♯
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the F♯s share one. Enharmonic spellings (F♯9 and G♭9) name the same pitch two ways. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | F♯9 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 11,624.552 Hz | the alternative-tuning circle |
| 440 Hzstandard | 11,839.822 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 11,893.639 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 11,920.548 Hz | some sharper continental orchestras |
Every row is F♯9 — only the A4 you tune to changes. A frequency scales straight with the reference: F♯9 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every F♯
Chords with F♯ in them
F♯ appears in each of these — see the whole chord grid.