Frequency to Musical Note Converter
Convert between musical note names and frequencies in Hz.
Find the note closest to any frequency.
Note / Frequency
Musical note frequencies follow the equal temperament system, where each octave doubles in frequency and is divided into 12 equal semitones.
Formula:
f = 440 × 2^((n - 49) / 12)
Where n is the key number (A4 = key 49) and 440 Hz is the standard tuning reference.
To find the note from a frequency:
n = 12 × log₂(f / 440) + 49
Reference frequencies (A4 = 440 Hz):
| Note | Frequency (Hz) |
|---|---|
| C4 (Middle C) | 261.63 |
| D4 | 293.66 |
| E4 | 329.63 |
| F4 | 349.23 |
| G4 | 392.00 |
| A4 | 440.00 |
| B4 | 493.88 |
| C5 | 523.25 |
Fun fact: The standard tuning pitch of A = 440 Hz was adopted internationally in 1955 in London, England.