Frequency to Musical Note Converter
Convert between frequencies and musical notes with precision
20 Hz
5000 Hz
Conversion Result
440 Hz = A4
Note Visualization
A4 – 440 Hz
Cents Deviation
0¢
Wavelength
78.4 cm
MIDI Number
69
Scientific Pitch
A₄
Piano Keyboard
Click keys to test notes
Common Note Frequencies (A4 = 440 Hz)
| Note | Frequency | MIDI | Octave |
|---|---|---|---|
| C4 (Middle C) | 261.63 Hz | 60 | 4 |
| A4 (Tuning Standard) | 440.00 Hz | 69 | 4 |
| C5 | 523.25 Hz | 72 | 5 |
| A5 | 880.00 Hz | 81 | 5 |
| C6 | 1046.50 Hz | 84 | 6 |
| A6 | 1760.00 Hz | 93 | 6 |
This converter uses the formula: Frequency = 440 × 2^(n/12) where n is the number of semitones from A4.
Use the piano keyboard to test different notes and hear their frequencies.