C diminished 7th

C diminished 7th guitar chord is also written as Cdim7 or Co7.

Below are up to 8 popular shapes for the C diminished 7th guitar chord, with suggested finger positions on the fretboard.

C diminished 7th guitar chord diagram

How to play the C diminished 7th chord

String numbers run from the thinnest string (1st) to the thickest string (6th). Match each numbered finger to the diagrams.

Shape x34242

Place your index finger (1) on the 2nd fret of the 1st (high E) string and 3rd (G) string in a barre.
Place your middle finger (2) on the 3rd fret of the 5th (A) string.
Place your ring finger (3) on the 4th fret of the 4th (D) string.
Place your little finger (4) on the 4th fret of the 2nd (B) string.
Do not play the 6th (low E) string.

Shape 807878

Place your index finger (1) on the 7th fret of the 2nd (B) string and 4th (D) string in a barre.
Place your middle finger (2) on the 8th fret of the 6th (low E) string.
Place your ring finger (3) on the 8th fret of the 3rd (G) string.
Place your little finger (4) on the 8th fret of the 1st (high E) string.
Let the 5th (A) string ring open.

View C diminished 7th inversions and slash chords

Cdim7/E♭ - Cdim7/G♭ - Cdim7/B♭♭

View diminished 7th chord for guitar with other root notes

C - D - E - F - G - A - B - C♯ - D♯ - F♯ - G♯ - A♯ - D♭ - E♭ - G♭ - A♭ - B♭