A#0 — 29.14 Hz
A#0 (MIDI 22) vibrates 29.14 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
A#0 at different reference pitches
| Reference (A4) | A#0 frequency | Used for |
|---|---|---|
| 415 Hz | 27.48 Hz | Baroque pitch |
| 432 Hz | 28.61 Hz | “Verdi” pitch |
| 440 Hz | 29.14 Hz | Standard concert pitch |
| 442 Hz | 29.27 Hz | European orchestras |
| 444 Hz | 29.40 Hz | European orchestras |
Physical properties
- Period: one cycle every 34.32 ms
- Wavelength in air: ≈ 11.77 m (at 20 °C, 343 m/s)
- MIDI note number: 22
- Octave up: A#1 = 58.27 Hz · Octave down: 14.57 Hz