D#7 — 2489.02 Hz
D#7 (MIDI 99) vibrates 2489.02 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
D#7 at different reference pitches
| Reference (A4) | D#7 frequency | Used for |
|---|---|---|
| 415 Hz | 2347.59 Hz | Baroque pitch |
| 432 Hz | 2443.76 Hz | “Verdi” pitch |
| 440 Hz | 2489.02 Hz | Standard concert pitch |
| 442 Hz | 2500.33 Hz | European orchestras |
| 444 Hz | 2511.64 Hz | European orchestras |
Physical properties
- Period: one cycle every 0.40 ms
- Wavelength in air: ≈ 13.8 cm (at 20 °C, 343 m/s)
- MIDI note number: 99
- Octave up: D#7 = 4978.03 Hz · Octave down: 1244.51 Hz