F#4 — 369.99 Hz
F#4 (MIDI 66) vibrates 369.99 times per second at standard concert pitch. Play the reference tone below, or tune to it with the online tuner.
F#4 at different reference pitches
| Reference (A4) | F#4 frequency | Used for |
|---|---|---|
| 415 Hz | 348.97 Hz | Baroque pitch |
| 432 Hz | 363.27 Hz | “Verdi” pitch |
| 440 Hz | 369.99 Hz | Standard concert pitch |
| 442 Hz | 371.68 Hz | European orchestras |
| 444 Hz | 373.36 Hz | European orchestras |
Physical properties
- Period: one cycle every 2.70 ms
- Wavelength in air: ≈ 92.7 cm (at 20 °C, 343 m/s)
- MIDI note number: 66
- Octave up: F#5 = 739.99 Hz · Octave down: 185.00 Hz