/notefreq — Note & Frequency
Convert between a note name, its MIDI number and its frequency in hertz — either way. See how many cents any frequency sits off the nearest note, tune to any reference A, and click to hear the pitch. All in your browser.
Hz
Note → frequency
Frequency → note
| Note | MIDI | Frequency |
|---|
The table lists the octave you picked above (12-tone equal temperament). Click any row to hear it. MIDI note 69 is A4; middle C is C4 = MIDI 60.