๐ต Music
Note Frequency Calculator
Every note frequency follows from A4 at 440 hertz by multiplying by the twelfth root of two for each semitone, which is what makes equal temperament work. Doubling the frequency raises a note by exactly one octave.
How it works
Note
Octave
Concert pitch
Frequency
MIDI note number
Wavelength in air
Cents from A4
Semitones from A4
Enharmonic name
One octave above
Frequently asked questions
How do I use the Note Frequency Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.