Understanding the result
Frequency is the detected fundamental estimate and the note is the nearest A4 = 440 Hz equal-tempered pitch. A stable, single sound gives the most useful reading.
Audio and music
Pitch Detector
Play one sustained note near the microphone. The detector shows the measured frequency and the closest equal-tempered note.
Detected note—Waiting for microphone
TuningA4 = 440 Hz
Play one note at a time in a quiet room. A4 reference: 440 Hz.
Background noise and multiple notes can make pitch detection unstable. Audio stays in the browser.
How to use this tool
- Allow microphone access.
- Play or sing one steady note.
- Read the frequency and note; stop when finished.
Troubleshooting
- Move closer to the microphone, reduce background noise and sustain one note at a time.
- If an octave is wrong, play more softly or change microphone position to reduce strong harmonics.
Browser and device limitations
Room noise, microphone response and harmonics affect detection; this is a musical aid, not calibrated acoustic measurement.
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Common questions
Why does the note jump?
A quiet signal, harmonics or several sounds at once can confuse the detector. Try a sustained note in a quiet room.
What is A4?
A4 is the reference A above middle C, normally set to 440 Hz here.
What frequency range works best?
Clear musical notes work best; very low fundamentals and very high or quiet sounds can be difficult for device microphones.