A diminished Chord (Adim) & A diminished 7th (Adim7) on Piano & Guitar
  A piano keyboard reference for the
  A diminished chord, abbreviated as
  Adim or
  A°. 
  The
  A diminished triad
  consists of the notes
  A,
  C
  and
  E♭. The 2 inversions to the A diminished triad are
  C E♭ A
  and
  E♭ A C. 
  The
  A diminished 7th chord, abbreviated as
  Adim7 or
  A°7, has the notes
  A,
  C,
  E♭
  and
  G♭. The
  3 inversions to the A diminished 7th chord are
  C E♭ G♭ A,
  E♭ G♭ A C
  and
  G♭ A C E♭.
  The intervals of the
  A diminished chord
  are the
  
    root (A) ,
  
    minor third (C)
  
  and
  
    diminished fifth (E♭). With the
  A diminished 7th chord, there's an additional
  
    diminished seventh (G♭). 
  🎸 You can also jump to
  guitar chord diagrams for the
  A diminished and A diminished7th chords in common positions on the
  guitar fretboard. You'll find both open chords and/or barre chords.
A diminished Chord on Piano
⌨️ hint: use numbers 1 to 7 on a computer keyboard to trigger the chords and their inversions.
A diminished chord
notes: A C E♭
- A
 - C
 - E♭
 
A diminished 1st inversion
notes: C E♭ A
- C
 - E♭
 - A
 
A diminished 2nd inversion
notes: E♭ A C
- E♭
 - A
 - C
 
A diminished 7th chord
notes: A C E♭ G♭
- A
 - C
 - E♭
 - G♭
 
A diminished 7th 1st inversion
notes: C E♭ G♭ A
- C
 - E♭
 - G♭
 - A
 
A diminished 7th 2nd inversion
notes: E♭ G♭ A C
- E♭
 - G♭
 - A
 - C
 
A diminished 7th 3rd inversion
notes: G♭ A C E♭
- G♭
 - A
 - C
 - E♭
 
🎸 A diminished Chord Guitar Diagrams
Below you'll find guitar chord diagrams for common chord positions of the A diminished chord and the A diminished 7th chord, along with finger positions or note names.