Chord

Cdim7 chord

Cdim7 is a diminished seventh chord with the notes C, E♭, G♭, B𝄫. Also written C°7.

E♭♭3

G♭♭5

B𝄫𝄫7

Intervals

Note	Interval	Semitones
C	root	0
E♭	minor 3rd	3
G♭	diminished 5th	6
B𝄫	diminished 7th	9

Inversions

Root position	C – E♭ – G♭ – B𝄫
1st inversion	E♭ – G♭ – B𝄫 – C (Cdim7/E♭)
2nd inversion	G♭ – B𝄫 – C – E♭ (Cdim7/G♭)
3rd inversion	B𝄫 – C – E♭ – G♭ (Cdim7/B𝄫)

Keys that contain Cdim7

Not diatonic to any major or natural minor key.

Related chords

C C7 Cmaj7 C6 Cadd9 Csus4

How to build a diminished seventh chord

A diminished seventh chord stacks three minor 3rds. It divides the octave into four equal parts, so the same four notes form diminished chords on four different roots; it often replaces a dominant chord.

Look up any other chord with the Scale & Chord Finder.