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C Diminished 7th Chord (Cdim7)

Notes: C, E♭, G♭, B𝄫. Tap any diagram to hear it.

Cdim7
Notes
CE♭G♭B𝄫
Formula
1 – ♭3 – ♭5 – 𝄫7

Cdim7 on guitar

Fret 1 · most common
x-3-1-2-1-2
Fret 8
8-9-10-8-10-8
Fret 13
x-15-13-14-13-14

Strings from low (left) to high (right). Numbers are fingers: 1 index, 2 middle, 3 ring, 4 pinky. × = don’t play, ○ = open string.

Cdim7 on ukulele

Fret 2 · most common
2-3-2-3
Fret 5
5-6-5-6
Fret 8
8-9-8-9

Cdim7 on piano

Other C chords

CCmC7Cmaj7Cm7Csus2Csus4CdimCaugC6Cm6C9Cadd9C7sus4Cm7♭5

Diminished 7th chords in other keys

C♯dim7Ddim7E♭dim7Edim7Fdim7F♯dim7Gdim7A♭dim7Adim7B♭dim7Bdim7

About the C Diminished 7th chord

Diminished seventh chords stack minor thirds all the way up, so the same shape repeats every three frets. They create strong, dramatic tension. Cdim7 is built from the root (C), minor third (E♭), diminished fifth (G♭), diminished seventh (B𝄫).

Frequently asked questions

What notes are in the C Diminished 7th chord?

The Cdim7 chord is made of C, E♭, G♭, B𝄫: the root, minor third, diminished fifth, diminished seventh.

How do you play Cdim7 on guitar?

The most common fingering is x-3-1-2-1-2, from the low E string to the high E string (x = don’t play that string, 0 = open string). It uses a barre at fret 1.

How do you play Cdim7 on piano?

Press C, E♭, G♭, B𝄫 together. In root position the lowest note is C.