D#3 — 155.56 Hz
D#3 (MIDI 51) vibrates 155.56 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
D#3 at different reference pitches
| Reference (A4) | D#3 frequency | Used for |
|---|---|---|
| 415 Hz | 146.72 Hz | Baroque pitch |
| 432 Hz | 152.74 Hz | “Verdi” pitch |
| 440 Hz | 155.56 Hz | Standard concert pitch |
| 442 Hz | 156.27 Hz | European orchestras |
| 444 Hz | 156.98 Hz | European orchestras |
Physical properties
- Period: one cycle every 6.43 ms
- Wavelength in air: ≈ 2.20 m (at 20 °C, 343 m/s)
- MIDI note number: 51
- Octave up: D#4 = 311.13 Hz · Octave down: 77.78 Hz