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About G♯0
G♯0 / A♭0 has a frequency of 25.96 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 20, outside the range of a standard piano.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so G♯0 is 49 semitones below A4: f = 440 × 2^((20 − 69) / 12) = 25.96 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
G♯0 and A♭0 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♯0 frequency in different tunings
| Tuning reference | G♯0 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 25.96 Hz |
| A4 = 442 Hz (many European orchestras) | 26.07 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 26.13 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 25.66 Hz |
| A4 = 432 Hz (alternative tuning) | 25.48 Hz |
| A4 = 415 Hz (Baroque pitch) | 24.48 Hz |
| C4 = 256 Hz (scientific pitch) | 25.4 Hz |
Intervals from G♯0
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | A0 | 27.5 Hz | 16:15 |
| Major second | A♯0 | 29.14 Hz | 9:8 |
| Minor third | B0 | 30.87 Hz | 6:5 |
| Major third | C1 | 32.7 Hz | 5:4 |
| Perfect fourth | C♯1 | 34.65 Hz | 4:3 |
| Tritone | D1 | 36.71 Hz | 45:32 |
| Perfect fifth | D♯1 | 38.89 Hz | 3:2 |
| Minor sixth | E1 | 41.2 Hz | 8:5 |
| Major sixth | F1 | 43.65 Hz | 5:3 |
| Minor seventh | F♯1 | 46.25 Hz | 9:5 |
| Major seventh | G1 | 49 Hz | 15:8 |
| Octave | G♯1 | 51.91 Hz | 2:1 |
Frequently asked questions
What is the frequency of G♯0?
G♯0 is 25.96 Hz when A4 = 440 Hz (25.48 Hz if A4 = 432 Hz).
What MIDI number is G♯0?
G♯0 is MIDI note number 20.
Is G♯0 on a piano?
No – a standard 88-key piano runs from A0 to C8, so G♯0 is outside its range.