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Dim & aug familyvii° in B♭ major

A diminished chord

Adim

A diminished

Piano root position

  • Root
  • ♭3
  • ♭5

Guitar standard tuning

Open chord

Uses open strings, no barre.

E×ADGBe×12345E♭AC

Finger: 1 index, 2 middle, 3 ring, 4 little

Notation treble clef

𝄞♭

Intervals

12 semitones
  1. A1
  2. ♭2
  3. 2
  4. C♭3
  5. 3
  6. 4
  7. E♭♭5
  8. 5
  9. ♯5
  10. 6
  11. ♭7
  12. 7
  • A Root
  • C Minor 3rd
  • E♭ Diminished 5th

About this chord

What is an A diminished chord?

Adim is built from 3 notes: A (the root), C (the ♭3), E♭ (the ♭5). Two minor thirds: tight, tense and unstable.

Notes
A · C · E♭
Formula
1 · ♭3 · ♭5
Also written
A° · Ao
Found in
vii° in B♭ major · ii° in G minor · vii° in B♭ harmonic minor

Scales that contain Adim

Neighbours

Chords close to Adim

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All 348 chords

Every chord type on every root, each with its own page.

C

D♭

D

E♭

E

F

G♭

G

A♭

A

B♭

B