Guitar Tuner: Free Online Tuner for Acoustic & Electric Guitar
Tune acoustic and electric guitars with real-time microphone pitch detection and visual tuning needles.
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How to Use the Guitar Tuner: Tune Your Guitar Online with Microphone
- 1Click 'Start Tuner' and allow microphone access.
- 2Pluck an open guitar string (e.g. low E).
- 3Adjust your tuning peg until the needle centers in the green zone.
Formula & How It Works
Autocorrelation Fundamental Pitch Detection
Applies time-domain autocorrelation algorithm to detect fundamental acoustic pitch from microphone buffer.
Worked Examples
Tuning Low E String (E2)
Input: Plucking 6th string (measured 80 Hz)
Explanation: Tune peg tighter to raise pitch to 82.41 Hz.
Frequently Asked Questions
Does this tuner work with electric guitars?▼
Yes, it works with unamplified electric guitars close to the mic, or through an amplifier/audio interface.
Quick Reference & Conversion Table
| String | Note | Frequency (Hz) | Octave |
|---|---|---|---|
| 6th String (Thickest) | E2 | 82.41 Hz | Bass register |
| 5th String | A2 | 110.00 Hz | Tenor register |
| 4th String | D3 | 146.83 Hz | Midrange |
| 3rd String | G3 | 196.00 Hz | Midrange |
| 2nd String | B3 | 246.94 Hz | Treble |
| 1st String (Thinnest) | E4 | 329.63 Hz | High treble |
⚠️ Common Pitfalls to Avoid
- •Plucking multiple strings at once (tune one single string at a time for clean pitch detection).
💡 Practical Real-World Uses
- •Tuning acoustic, classical, electric, and bass guitars before practice sessions.
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