A diminished seventh piano chord - Adim7

The A diminished seventh chord is a 4-note chord consisting of the notes A, C, Eb and Gb.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Adim7.

Interactive piano diagram for the A diminished seventh chord

Piano keyboard displaying the A diminished seventh chord with the notes AB#CD#EbF#Gb

Reduced chords

Chords that are a subset of Adim7. These contain less notes but all of them are included in Adim7.

Scales with Adim7

Below you find all scales that include Adim7:

  • ultralocrian
  • locrian 6
  • dorian #4
  • lydian diminished
  • hungarian major
  • lydian #9
  • diminished
  • half-whole diminished
  • composite blues
  • messiaen's mode #7
  • chromatic

A diminished seventh piano chord chart image

In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Adim7 chord. Feel free to save or share the image as needed.

Piano chord chart for the A diminished seventh chord (Adim7). The notes A, C, Eb and Gb are highlighted.