Chord family · 12 shapes
Diminished chords
A diminished chord is a root, a minor third and a flat fifth — three notes stacked in minor thirds, which is why it sounds unsettled. Because the stack is symmetrical, every diminished shape repeats itself every three frets: move any dim shape up three frets and you get a different dim chord with exactly the same fingering.
On guitar, dim shapes almost always appear as passing chords. They last a beat or two, linking two stable chords a semitone apart, and they are far more common in jazz, bossa nova and older standards than in rock or pop.
Diminished
12 shapesHow to use diminished chords in a song
The practical way to use them is as a substitute. A diminished chord a semitone below its target behaves like a dominant seventh that has lost its root, so Cdim can stand in for A7 when the music is heading to Dm, and Ddim can stand in for B7 on the way to Em. Drop the substitute into a progression you already play and listen to how much more tense the arrival becomes.
That symmetry is also the fastest way to learn the whole family. Learn one fingering, then slide it: Cdim at the 3rd fret, the same shape at the 6th, 9th and 12th fret gives you Ebdim, F#dim and Adim. Four chord names, one hand movement.
The mistake is holding one too long. A diminished chord is a chord in motion, not a chord to sit on; stretch it across a full bar and the music stops sounding like it is going anywhere. One or two beats, then let the next chord resolve.
Of the 12 shapes on this page, 3 stay in the open position and 9 are movable barre shapes, so nothing here depends on a stretch you have not built yet. What it does depend on is knowing what comes next, because a diminished chord is only meaningful as an approach to the chord after it.
If you only try two of the shapes on this page, try Cdim and C#dim: both can be reached from shapes you already know, so the change stays playable at speed. Loop the pair with a metronome at 60 and resist the urge to fix the rhythm later: the change has to land on the beat from day one.
How to practise diminished chords
- Play Cdim at the 3rd fret, then slide the same shape to the 6th, 9th and 12th fret without changing your fingers. Say each chord name out loud as you land on it.
- Loop Dm7b5 → G7 → Cm, then swap the G7 for Bdim and hear how much more tense the resolution becomes. Both are correct; the second is the jazzier choice.
- Play a diminished chord for two beats, then a chord a semitone above it for two beats. Repeat down the neck. This is the resolution your ear needs to learn.
Diminished chords in real songs
None of the 80 songs charted on this site uses a diminished chord, and that is worth knowing before you spend a week on the family. It is vocabulary for jazz standards and bossa nova, not a key to the songs you are playing this month.
Printable family chart
