C#5 — 554.37 Hz
C#5 (MIDI 73) vibrates 554.37 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
C#5 at different reference pitches
| Reference (A4) | C#5 frequency | Used for |
|---|---|---|
| 415 Hz | 522.87 Hz | Baroque pitch |
| 432 Hz | 544.29 Hz | “Verdi” pitch |
| 440 Hz | 554.37 Hz | Standard concert pitch |
| 442 Hz | 556.89 Hz | European orchestras |
| 444 Hz | 559.40 Hz | European orchestras |
Physical properties
- Period: one cycle every 1.80 ms
- Wavelength in air: ≈ 61.9 cm (at 20 °C, 343 m/s)
- MIDI note number: 73
- Octave up: C#6 = 1108.73 Hz · Octave down: 277.18 Hz