D1 — 36.71 Hz
D1 (MIDI 26) vibrates 36.71 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
D1 at different reference pitches
| Reference (A4) | D1 frequency | Used for |
|---|---|---|
| 415 Hz | 34.62 Hz | Baroque pitch |
| 432 Hz | 36.04 Hz | “Verdi” pitch |
| 440 Hz | 36.71 Hz | Standard concert pitch |
| 442 Hz | 36.87 Hz | European orchestras |
| 444 Hz | 37.04 Hz | European orchestras |
Physical properties
- Period: one cycle every 27.24 ms
- Wavelength in air: ≈ 9.34 m (at 20 °C, 343 m/s)
- MIDI note number: 26
- Octave up: D2 = 73.42 Hz · Octave down: 18.35 Hz