C4 — 261.63 Hz
C4 (MIDI 60) vibrates 261.63 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
C4 at different reference pitches
| Reference (A4) | C4 frequency | Used for |
|---|---|---|
| 415 Hz | 246.76 Hz | Baroque pitch |
| 432 Hz | 256.87 Hz | “Verdi” pitch |
| 440 Hz | 261.63 Hz | Standard concert pitch |
| 442 Hz | 262.81 Hz | European orchestras |
| 444 Hz | 264.00 Hz | European orchestras |
Physical properties
- Period: one cycle every 3.82 ms
- Wavelength in air: ≈ 1.31 m (at 20 °C, 343 m/s)
- MIDI note number: 60
- Octave up: C5 = 523.25 Hz · Octave down: 130.81 Hz