G9
12,543.854Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
127
Piano key
—
Octave
9
Frequency
12,543.854 Hz
Period
0.0797 ms
Wavelength
0.0273 m
Pitch class
G
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the Gs share one. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | G9 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 12,315.784 Hz | the alternative-tuning circle |
| 440 Hzstandard | 12,543.854 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 12,600.871 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 12,629.38 Hz | some sharper continental orchestras |
Every row is G9 — only the A4 you tune to changes. A frequency scales straight with the reference: G9 at 432 Hz is the 440 Hz value times 432⁄440.
About this note
The top of the MIDI note range — number 127, the highest note the 7-bit MIDI standard can name. Its fundamental sits above the top of most adult hearing, so it's more a limit of the protocol than a note you'd play.
Move around
Every G
Chords with G in them
G appears in each of these — see the whole chord grid.