Cdim Piano Chord

The Cdim chord is a diminished triad built on the root note C. It contains the notes C, D#, F#.

How to play Cdim

Press all highlighted keys together. Use any comfortable fingering — for a right-hand triad, thumb on root, middle on 3rd, pinky on 5th is standard.

Master one chord at a time. Once Cdim feels natural, try the next chord chord, or browse easy piano songs to put it in context.