Pitch Detector
Sing, hum or play one note and see its name, frequency in Hz and how many cents sharp or flat it is, live from your microphone. Nothing is recorded or uploaded.
Common notes to check yourself against
| Instrument | Open strings / range (low → high) |
|---|---|
| Guitar (standard) | E2 82.4 · A2 110 · D3 146.8 · G3 196 · B3 246.9 · E4 329.6 Hz |
| Bass (4-string) | E1 41.2 · A1 55 · D2 73.4 · G2 98 Hz |
| Ukulele | G4 392 · C4 261.6 · E4 329.6 · A4 440 Hz |
| Violin | G3 196 · D4 293.7 · A4 440 · E5 659.3 Hz |
| Typical speaking voice | Male about 85–180 Hz · Female about 165–255 Hz |
Questions
How does the pitch detector work?
It listens to your microphone in your browser and runs the YIN pitch-detection algorithm on short slices of sound about 20 times per second. It finds the repeating period of the waveform, converts it to a frequency in Hz and then to the nearest musical note.
What does cents mean?
A cent is one hundredth of a semitone. Zero cents means perfectly in tune with the note shown; plus means sharp (too high), minus means flat (too low). Most listeners hear a difference at about 10 to 20 cents.
Why does it show the wrong note or jump an octave?
Background noise, several notes at once (chords) and very quiet or breathy sounds confuse any single-pitch detector. Sing or play one note at a time, close to the microphone, in a quiet room. Harmonics can also make a low note read an octave too high; play louder and let the note ring.
What is the A4 reference?
Concert pitch sets A above middle C to 440 Hz. Some orchestras and early-music groups use 415, 432 or 442 Hz. Change the reference and all notes and cents are recalculated.
Is my audio recorded?
No. The sound is analysed live in your browser and is never recorded, stored or uploaded.
Having trouble with the microphone itself? Use the online microphone test to check that your mic works.