D diminished seventh (Ddim7) chord on piano

Diminished seventh chord (three stacked minor thirds) on D: the notes of the Ddim7 chord are D – F – A♭ – C♭.

Root position: D4 – F4 – A♭4 – C♭5

What the Ddim7 chord sounds like

A diminished seventh is three stacked minor thirds, so it is symmetrical: four different roots give the same notes. A dramatic, tense passing chord.

Notes of the Ddim7 chord

Degree	Note	Interval from the root
1	D	root
3	F	minor third (3 semitones)
5	A♭	diminished fifth (6 semitones)
7	C♭	diminished seventh (9 semitones)

Root position and inversions

An inversion uses the same notes, with a different note at the bottom. When you change chords, choosing the nearest inversion keeps your hand almost still.

Root position

D4 – F4 – A♭4 – C♭5

1st inversion

F4 – A♭4 – C♭5 – D5

2nd inversion

A♭4 – C♭5 – D5 – F5

3rd inversion

C♭5 – D5 – F5 – A♭5

Which keys is it in?

The Ddim7 chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

E♭ minor: vii°7

Similar chords and substitutes

If Ddim7 is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

B♭7 – an incomplete dominant: the diminished chord is the top of this seventh chord
E♭ – where it leads (leading tone → root)

Same notes

Fdim7 – the same notes with a different root
A♭dim7 – the same notes with a different root
Bdim7 – the same notes with a different root

Simpler versions

Ddim – all 3 of its notes are in this chord

Frequently asked questions

What notes are in the Ddim7 chord?

D, F, A♭, C♭. The root is D; the intervals of the other notes from the root: minor third, diminished fifth, diminished seventh.

How do I play the Ddim7 chord on piano?

In root position, the right hand usually plays with fingers 1, 3 and 5 (thumb, middle finger, little finger); four-note chords with fingers 1, 2, 3 and 5. The left hand mirrors this: 5, 3, 1. In an inversion the top or bottom note moves to the other side, so your hand moves less when you change chords.

How is the Ddim7 chord written?

The chord symbol is Ddim7, and its full name is D diminished seventh.