C2 — 65.41 Hz
C2 (MIDI 36) vibrates 65.41 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
C2 at different reference pitches
| Reference (A4) | C2 frequency | Used for |
|---|---|---|
| 415 Hz | 61.69 Hz | Baroque pitch |
| 432 Hz | 64.22 Hz | “Verdi” pitch |
| 440 Hz | 65.41 Hz | Standard concert pitch |
| 442 Hz | 65.70 Hz | European orchestras |
| 444 Hz | 66.00 Hz | European orchestras |
Physical properties
- Period: one cycle every 15.29 ms
- Wavelength in air: ≈ 5.24 m (at 20 °C, 343 m/s)
- MIDI note number: 36
- Octave up: C3 = 130.81 Hz · Octave down: 32.70 Hz