Chord · Triads

Cdim — C Diminished

Cdim is the C diminished chord. It is built on the root C with minor 3rd (E♭) and diminished 5th (G♭) above it — the formula 1 ♭3 ♭5, sounding the notes C E♭ G♭. On the piano it sits at C (octave 4) and above in the library's voicing; the same 3 notes in any octave are still Cdim.

Root: C
Quality: Diminished
Formula: 1 ♭3 ♭5
Notes: C E♭ G♭

On the keyboard

Right-hand fingering for this voicing: 1–3–5 (1 is the thumb).

The notes of Cdim

Degree	Note	Interval from the root	Pitch
1	C	root	C4
♭3	E♭	minor 3rd	E♭4
♭5	G♭	diminished 5th	G♭4

Other triads on C

C Cm Caug Csus2 Csus4 C5

Diminished chords on every root

C♯dim Ddim E♭dim Edim Fdim F♯dim Gdim G♯dim Adim B♭dim Bdim

Part of the chord reference. See also the scales and the keys.