A#3 — 233.08 Hz
A#3 (MIDI 58) vibrates 233.08 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
A#3 at different reference pitches
| Reference (A4) | A#3 frequency | Used for |
|---|---|---|
| 415 Hz | 219.84 Hz | Baroque pitch |
| 432 Hz | 228.84 Hz | “Verdi” pitch |
| 440 Hz | 233.08 Hz | Standard concert pitch |
| 442 Hz | 234.14 Hz | European orchestras |
| 444 Hz | 235.20 Hz | European orchestras |
Physical properties
- Period: one cycle every 4.29 ms
- Wavelength in air: ≈ 1.47 m (at 20 °C, 343 m/s)
- MIDI note number: 58
- Octave up: A#4 = 466.16 Hz · Octave down: 116.54 Hz