Chromatic tuner
A free online chromatic tuner for any instrument or voice. Play or sing a note and it shows the nearest note name, the octave, and how far sharp or flat you are. Use it for wind and brass instruments, harmonica, singing, or a stringed instrument in an unusual tuning.
How to use it
- Tap Use microphone and allow access when your browser asks.
- Play or sing one steady note, close to the device.
- The big letter is the nearest note. If it says Tune up you are flat; if it says Tune down you are sharp.
- Adjust until the pointer sits in the green zone. Switch to Advanced to see the exact cents and frequency.
Note frequency chart
The frequencies of the notes in the octave above middle C (C4), with A4 at 440 Hz. Each octave up doubles the frequency, and each octave down halves it.
| Note | Frequency |
|---|---|
| C4 | 261.63 Hz |
| C♯4 | 277.18 Hz |
| D4 | 293.66 Hz |
| D♯4 | 311.13 Hz |
| E4 | 329.63 Hz |
| F4 | 349.23 Hz |
| F♯4 | 369.99 Hz |
| G4 | 392.00 Hz |
| G♯4 | 415.30 Hz |
| A4 | 440.00 Hz |
| A♯4 | 466.16 Hz |
| B4 | 493.88 Hz |
Chromatic tuner questions
What is a chromatic tuner?
A chromatic tuner detects any of the twelve notes, rather than only the strings of one instrument. It shows the nearest note and how many cents sharp or flat you are.
Can I use it for singing?
Yes. Sing a steady note close to the microphone and the tuner shows which note you are on and whether you are sharp or flat.
What instruments does it work with?
Anything with a clear, steady pitch: guitar, bass, ukulele, violin, wind and brass instruments, harmonica and voice.
Why can't the tuner hear me?
Usually the browser hasn't been given access to the microphone, or it is listening to a different input. The tuner will tell you which, and how to fix it. Play one string at a time, close to the device.
Is my audio recorded?
No. The sound is analysed on your own device in real time. Nothing is recorded, stored or uploaded.