Online Tuner — A=440 Hz
Select any note and octave to hear its exact reference pitch at A4=440 Hz — useful for tuning guitar, bass, violin, and other instruments.
100% client-side · no upload
440.00
Hz
| Note | Hz |
|---|
How to use
- Select the note name and octave number from the dropdowns.
- The frequency in Hz updates automatically.
- Press Play to hear the reference pitch through your speakers or headphones.
Related music tools
- Note Frequency Calculator — see frequencies for all notes across octaves
- Interval Trainer — learn intervals between notes
- Chord Finder — find the notes in any chord
常见问题
- Is this online tuner free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. The tuner uses the Web Audio API inside your browser. No data is sent to any server.
- Does it work on mobile?
- Yes. The tuner works on iPhone Safari and Android Chrome. Make sure your volume is turned up.