B4 — 493.88 Hz
B4 (MIDI 71) vibrates 493.88 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
B4 at different reference pitches
| Reference (A4) | B4 frequency | Used for |
|---|---|---|
| 415 Hz | 465.82 Hz | Baroque pitch |
| 432 Hz | 484.90 Hz | “Verdi” pitch |
| 440 Hz | 493.88 Hz | Standard concert pitch |
| 442 Hz | 496.13 Hz | European orchestras |
| 444 Hz | 498.37 Hz | European orchestras |
Physical properties
- Period: one cycle every 2.02 ms
- Wavelength in air: ≈ 69.4 cm (at 20 °C, 343 m/s)
- MIDI note number: 71
- Octave up: B5 = 987.77 Hz · Octave down: 246.94 Hz