B2 — 123.47 Hz
B2 (MIDI 47) vibrates 123.47 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
B2 at different reference pitches
| Reference (A4) | B2 frequency | Used for |
|---|---|---|
| 415 Hz | 116.46 Hz | Baroque pitch |
| 432 Hz | 121.23 Hz | “Verdi” pitch |
| 440 Hz | 123.47 Hz | Standard concert pitch |
| 442 Hz | 124.03 Hz | European orchestras |
| 444 Hz | 124.59 Hz | European orchestras |
Physical properties
- Period: one cycle every 8.10 ms
- Wavelength in air: ≈ 2.78 m (at 20 °C, 343 m/s)
- MIDI note number: 47
- Octave up: B3 = 246.94 Hz · Octave down: 61.74 Hz