GuitarTuner.online

6-String Guitar tuner – Open Gm

D-G-D-G-A#-D · Open

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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 Gm tuning (D-G-D-G-A#-D). 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 Gm tuning

Compared with Standard E, Open Gm moves 4 strings. Every change is downward, the largest by 2 semitones, so the instrument sits at lower tension than in Standard E.2 strings stay exactly where they were.

How Open Gm differs from Standard E, string by string.
StringStandard EOpen GmChange
1E2D2down 2 semitones
2A2G2down 2 semitones
5B3A#3down 1 semitone
6E4D4down 2 semitones

Played open, the strings sound D-G-D-G-A#-D – from D2 at the bottom to D4 at the top, a span of 2 octaves. Step by step across the neck the intervals are a fourth, a fifth, a fourth, a minor third, a major third, and that is what decides how chord shapes fall under the hand.

Strummed open, with nothing fretted, the strings spell Gm. 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 Gm shapes in this tuning →

The drop is small enough that a standard set handles it. If the lowest string starts to rattle against the frets, one step up in gauge fixes it.

History

Where the Open Gm tuning comes from

Open G minor is the minor counterpart of the old “Spanish” open G and belongs to the cross-note tunings of the early blues. It has been used for slow minor blues and for modal folk songs; no specific creator is known.

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 Gm?

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 (D-G-D-G-A#-D).

Which notes are used in Open Gm tuning?

Open Gm tuning for 6-String Guitar uses the notes D-G-D-G-A#-D, 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.