Frequency to Note Converter
Find the nearest musical note or calculate the frequency of a note.
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Contents
Convert frequencies to musical notes
This converter uses twelve-tone equal temperament and scientific pitch notation, with middle C written as C4. Enter a frequency to find its closest note and cents offset. A positive cents value means the frequency is above that note; a negative value means it is below. One semitone contains 100 cents.
Use a different tuning reference
A4 defaults to 440 Hz and can be changed to match your ensemble. In note-to-frequency mode, enter a letter, an optional sharp or flat, and an octave, such as F#3 or Bb4. The calculation gives a theoretical pitch frequency; it does not analyze a microphone signal or identify a sound’s fundamental.
Using the Frequency to Note Converter
Compare a frequency with a musical note or find the theoretical frequency of a note you name. This is useful for pitch references and understanding tuning offsets.
Instructions
- Check A4 reference (Hz), then choose the Conversion direction.
- Enter Frequency (Hz), or a note with its octave such as C#4 or Bb3 in note-to-frequency mode.
- Read the note and cents offset or the calculated frequency. Change the reference if your ensemble uses a different A4.
Reading cents and octave numbers
With A4 at 440 Hz, 220 Hz is A3 and C4 is about 261.626 Hz. A positive cents offset is above the nearest note; a negative offset is below it. Sharp and flat names can refer to the same frequency in this equal-temperament calculation.
What to do if a note is not accepted
- Include an octave number and use one letter plus an optional sharp or flat. A name such as C major is a chord, not a single pitch.
- Enter the value in the field enabled for your chosen direction. The other input is inactive.
- Check the displayed limits and A4 reference. The converter does not listen to microphone audio.
Use the result as a calculated reference. A complex sound contains several frequencies, so this conversion alone cannot identify its fundamental note.
