Open Cm tuning

Guitar with open C minor tuningThe open Cm tuning is an alternative tuning for guitar. It only diviate with one half note compared to the open C major tuning.

To get the open C minor tuning on your guitar, you tune it like this: CGCGCEb. The strings that differ from the standard should be turned so the string tension is decreased and not the opposite. The exception is the second string which should be tuned up from B to C. This will increase the tension on that string, but only with a semi-step which normally don't result in string breakage.

More info

Including an octave perspective, the tuning is written C2-G2-C3-G3-C4-Eb4, meaning that the lowest string is a C note on the second octave, the second lowest string is a G note on the second octave and so on. Standard tuning reference: E2-A2-D3-G3-B3-E4.



  • Cm chord diagram


  • Cm7 chord diagram


  • Cmaj7 chord diagram


  • Ebmaj7 chord diagram


  • Ab chord diagram


  • Fm chord diagram


  • Gm7 chord diagram


  • Bbmaj7 chord diagram


The Ebma7 chord version is an inversion and is more correctly written Ebmaj7/Bb, but is chosen here since its fingerings are straightforward.

The Fm chord version is also an inversion and is more correctly written Fm/Ab. It's chosen here since it offers a natural fingering.

The Gm7 is probably easiest to play with a finger baring the fourth highest strings on the second fret.

Additional open chords in this tuning:

Cm6/9: 022000
Cmadd2: 002000
Csus4: XX0002
Ddim: XX2122
Dm7b5: XX2102
Eb5: XX3330
Eb6: 330000
Fm/C: XX0102

See below for pdf chord chart ("Essential Chords in Open Dm Tuning ebook") for many more voicings, progressions etc.

Movable shapes


  • One finger bar chord diagram 1


  • One finger bar chord diagram 2


  • Half bar one finger bar chord diagram 1


  • Half bar one finger bar chord diagram 2


  • Eb chord diagram


  • Ab chord diagram


  • Bb chord diagram


These are the main diatonic major and minor chords in the key of Cm. The minor iv and v chords can as the diagram shows be played either with full or half one-finger barre fingerings.

Other possibilities for one-finger chords in Open C minor tuning:

Dbm: 111111 / XX1111
Ebm: 333333 / XX3333
Fm: 555555 / XX5555
Gm: 777777 / XX7777
Am: 999999 / XX9999

Chord progressions

Progressions in this specific tuning:

Ab (XX8889) - Gm7 (XX7777) - Eb (XX3334) - Cmsus4 (XX0002) - Cm (XX0000)

C Minor 7th tuning

Besides the C-G-C-G-C-Eb version presented here, there are the less known Open C Minor 7th tuning: C-G-C-G-Bb-Eb.

Some chords in Open Cm7 Tuning:

Cm7: 000000 / 003500
Cm9: 033040
Cm11: 033002
Ebmaj7/Bb: X32000
Ebmaj13/G: X02200
Gm6/D: XX02001
Bbmaj7/D: XX02202

See also open Dm tuning and open Gm tuning