G♯1 / A♭1
51.913Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
32
Piano key
12
Octave
1
Frequency
51.913 Hz
Period
19.263 ms
Wavelength
6.6072 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 G♯s share one. Enharmonic spellings (G♯1 and A♭1) name the same pitch two ways.
At other reference pitches
| Reference (A4) | G♯1 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 50.969 Hz | the alternative-tuning circle |
| 440 Hzstandard | 51.913 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 52.149 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 52.267 Hz | some sharper continental orchestras |
Every row is G♯1 — only the A4 you tune to changes. A frequency scales straight with the reference: G♯1 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every G♯
Chords with G♯ in them
G♯ appears in each of these — see the whole chord grid.