A♭0 at every common reference pitch
A note’s frequency depends on what A4 is tuned to. The standard is 440 Hz; the other three are the ones you are most likely to meet. The cents column is how far each one sits from the 440 version — the same for every note, because changing the reference moves the whole scale together.
| Reference | A♭0 | vs 440 |
|---|---|---|
| A4 = 415 Hz · Baroque pitch | 24.48 Hz | −101.3¢ |
| A4 = 432 Hz · “Verdi” pitch | 25.48 Hz | −31.8¢ |
| A4 = 440 Hz · Standard (ISO 16) | 25.96 Hz | — |
| A4 = 442 Hz · Orchestral | 26.07 Hz | +7.9¢ |
One cycle of A♭0 lasts 38.526 ms, and its wavelength in air at 20 °C is 13.21 m. Hold it as a steady tone in the tone generator.
A♭0 on the piano
A♭0 is below the bottom of an 88-key piano, whose lowest key is A0 — 1 semitone lower than that. Press any key below to compare it with its neighbours.
A♭0 on the guitar
A♭0 is below the guitar’s lowest note, the open low E (E2), so a guitar in standard tuning cannot play it.
A♭0 on the staff
Instruments that can play A♭0
None of the instruments in our range charts reach A♭0.
A♭0 is outside the typical range of all six voice types. Test your own range.
The harmonics of A♭0
A played A♭0 is not one frequency. A string or a pipe also sounds whole-number multiples of it, and the mix of those harmonics is the instrument’s tone. Here is where the first eight land — and why the 7th sounds out of tune against a piano.
| Harmonic | Frequency | Nearest note | Off by |
|---|---|---|---|
| 1 (fundamental) | 25.96 Hz | A♭0 | 0¢ |
| 2 | 51.91 Hz | A♭1 | 0¢ |
| 3 | 77.87 Hz | E♭2 | +2.0¢ |
| 4 | 103.83 Hz | A♭2 | 0¢ |
| 5 | 129.78 Hz | C3 | −13.7¢ |
| 6 | 155.74 Hz | E♭3 | +2.0¢ |
| 7 | 181.70 Hz | F♯3 | −31.2¢ |
| 8 | 207.65 Hz | A♭3 | 0¢ |
Frequently asked questions
What is the frequency of A♭0?
A♭0 is 25.96 Hz in equal temperament with A4 tuned to 440 Hz, the international standard. At A4 = 432 Hz it is 25.48 Hz, and at the orchestral A4 = 442 Hz it is 26.07 Hz.
Is A♭0 the same note as G♯0?
On a piano, a guitar or a tuner, yes: A♭0 and G♯0 are the same key and the same frequency, 25.96 Hz, in equal temperament. They are two names for one pitch (enharmonic equivalents). Which one is written depends on the key — sharps in sharp keys, flats in flat keys — and a string or wind player may pitch them a few cents apart when playing in just intonation.
How do I play A♭0 on a piano?
A♭0 is below the bottom of an 88-key piano, whose lowest key is A0 — 1 semitone lower than that.
Which instruments can play A♭0?
None of the instruments we chart reach A♭0; it is outside the range of ordinary instruments.
Typing it? A♭0 is also written Ab0 or G#0. Convert any frequency on the Hz-to-note converter.