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About G♯1
G♯1 / A♭1 has a frequency of 51.91 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 32 and key number 12 on an 88-key piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so G♯1 is 37 semitones below A4: f = 440 × 2^((32 − 69) / 12) = 51.91 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
G♯1 and A♭1 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.
G♯1 frequency in different tunings
| Tuning reference | G♯1 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 51.91 Hz |
| A4 = 442 Hz (many European orchestras) | 52.15 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 52.27 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 51.32 Hz |
| A4 = 432 Hz (alternative tuning) | 50.97 Hz |
| A4 = 415 Hz (Baroque pitch) | 48.96 Hz |
| C4 = 256 Hz (scientific pitch) | 50.8 Hz |
Intervals from G♯1
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | A1 | 55 Hz | 16:15 |
| Major second | A♯1 | 58.27 Hz | 9:8 |
| Minor third | B1 | 61.74 Hz | 6:5 |
| Major third | C2 | 65.41 Hz | 5:4 |
| Perfect fourth | C♯2 | 69.3 Hz | 4:3 |
| Tritone | D2 | 73.42 Hz | 45:32 |
| Perfect fifth | D♯2 | 77.78 Hz | 3:2 |
| Minor sixth | E2 | 82.41 Hz | 8:5 |
| Major sixth | F2 | 87.31 Hz | 5:3 |
| Minor seventh | F♯2 | 92.5 Hz | 9:5 |
| Major seventh | G2 | 98 Hz | 15:8 |
| Octave | G♯2 | 103.83 Hz | 2:1 |
Instruments and voices that can play G♯1
Frequently asked questions
What is the frequency of G♯1?
G♯1 is 51.91 Hz when A4 = 440 Hz (50.97 Hz if A4 = 432 Hz).
What MIDI number is G♯1?
G♯1 is MIDI note number 32.
Is G♯1 on a piano?
Yes – it is key 12 of 88.