Free Online Guitar & Bass Chromatic Tuner
Free online tuner for guitar, acoustic guitar and bass in the browser. Ultra-precise chromatic tuning using the microphone or sound card. No apps to install.
Complete Guitar & Bass Tuning Guide
Our chromatic tuner uses real-time autocorrelation and YIN pitch-detection algorithms to measure exact string frequencies in Hertz (Hz) based on standard concert pitch (A4 = 440 Hz).
Standard Guitar Tuning Frequency Reference Chart (EADGBE)
| String | Note | Frequency (Hz) | Scientific Octave |
|---|---|---|---|
| 6th String (Low E) | E | 82.41 Hz | E2 |
| 5th String (A) | A | 110.00 Hz | A2 |
| 4th String (D) | D | 146.83 Hz | D3 |
| 3rd String (G) | G | 196.00 Hz | G3 |
| 2nd String (B) | B | 246.94 Hz | B3 |
| 1st String (High E) | E | 329.63 Hz | E4 |
Acoustic Physics: 12-Tone Equal Temperament & Harmonics
Fretted guitars rely on 12-Tone Equal Temperament (12-TET), dividing an octave into 12 equal semitone ratios (2^(1/12) ≈ 1.059463). Checking natural harmonics at the 5th and 7th frets allows guitarists to fine-tune using acoustic beat frequency cancellation.
FAQ
How to tune guitar using computer or phone microphone?
Click Start Tuner, allow microphone access in your browser, and play one string at a time. The tuner detects the pitch in Hertz and indicates whether to tune up or down.
What are standard guitar tuning frequencies in Hz?
E2 (82.41 Hz), A2 (110.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), B3 (246.94 Hz), E4 (329.63 Hz).