GuitarTuner.online

6-String Guitar tuner – Open A 2

E-A-E-A-C#-E · Open

Also known as Slide A

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Microphone off
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Press “Start tuner” – the browser will ask for microphone access. Sound is analysed on this device and never uploaded.

This free online tuner listens through your microphone and shows how close each string of your 6-String Guitar is to Open A 2 tuning (E-A-E-A-C#-E). Play a string, watch the needle, and turn the peg until the meter glows green. If you prefer tuning by ear, tap any string card to hear its reference tone.

About Open A 2 tuning

Compared with Standard E, Open A 2 moves 3 strings. Every change is upward, the largest by 2 semitones, so the strings pull tighter than in Standard E.3 strings stay exactly where they were.

How Open A 2 differs from Standard E, string by string.
StringStandard EOpen A 2Change
3D3E3up 2 semitones
4G3A3up 2 semitones
5B3C#4up 2 semitones

Played open, the strings sound E-A-E-A-C#-E – from E2 at the bottom to E4 at the top, a span of 2 octaves. Step by step across the neck the intervals are a fourth, a fifth, a fourth, a major third, a minor third, and that is what decides how chord shapes fall under the hand.

Strummed open, with nothing fretted, the strings spell A. That is what makes a tuning like this useful for slide playing and drones – a full chord is one straight barre away at any fret. See A shapes in this tuning →

The strings are pulled above their normal pitch, so a lighter set reduces the risk of breaking a string or over-loading the neck.

History

Where the Open A 2 tuning comes from

E-A-E-A-C#-E is open G raised a whole step: the same shape, the same chord intervals, a brighter key. Blues players often reached it with a capo on the second fret in open G, and several recordings of the 1930s, Robert Johnson's among them, sound in open A. It remains a standard slide tuning.

History of the instrument: 6-String Guitar →

Other 6-String Guitar tunings

Standard

Standard E E-A-D-G-B-EHalf Step Down (Eb) D#-G#-C#-F#-A#-D#Whole Step Down (D) D-G-C-F-A-DB Standard B-E-A-D-F#-BPlus 1 (F) F-A#-D#-G#-C-FPlus 2 (F#) F#-B-E-A-C#-F#

Drop

Drop D D-A-D-G-B-EDouble Drop D D-A-D-G-B-DDrop C# C#-G#-C#-F#-A#-D#Drop C C-G-C-F-A-DDrop B B-F#-B-E-G#-C#Drop A A-E-A-D-F#-BDrop G# G#-D#-G#-C#-F-A#Drop G G-D-G-C-E-ADrop F# F#-C#-F#-B-D#-G#Drop E E-B-E-A-C#-F#

Open

Open C C-G-C-G-C-EOpen D D-A-D-F#-A-DOpen Dm D-A-D-F-A-DOpen E E-B-E-G#-B-EOpen Em E-B-E-G-B-EOpen F C-F-C-F-A-FOpen G D-G-D-G-B-DOpen Gm D-G-D-G-A#-DOpen A E-A-C#-E-A-EOpen A 2 E-A-E-A-C#-EOpen Am E-A-E-A-C-EOpen B B-F#-B-F#-B-D#CGDGBD (Open G Low C) C-G-D-G-B-DFACGCE (Fmaj7) F-A-C-G-C-EWahine (G) D-G-D-F#-B-D

Modal

DADGAD (D Modal) D-A-D-G-A-DG Modal D-G-D-G-C-DOrkney C-G-D-G-C-D

Alternative

Double Daddy D-A-D-D-A-DAll Fourths E-A-D-G-C-FNew Standard (NST) C-G-D-A-E-GNashville (High Strung) E-A-D-G-B-EEADF#BE E-A-D-F#-B-EOstrich D-D-D-D-D-D

Chords for this tuning

CGDAEFAll 6-String Guitar chords →
How do I tune my 6-String Guitar to Open A 2?

Allow microphone access, pluck a string, and the tuner will detect it automatically. The needle shows whether the string is flat or sharp – adjust until the reading is within ±5 cents (E-A-E-A-C#-E).

Which notes are used in Open A 2 tuning?

Open A 2 tuning for 6-String Guitar uses the notes E-A-E-A-C#-E, listed from the lowest string to the highest.

Can I tune without a microphone?

Yes. Every string card plays a reference tone – tap it and match your string to the sound by ear.