B diminished seventh piano chord - Bdim7

The B diminished seventh chord is a 4-note chord consisting of the notes B, D, F and Ab.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Bdim7.

Interactive piano diagram for the B diminished seventh chord

Piano keyboard displaying the B diminished seventh chord with the notes Cb B D E# F G# Ab

Reduced chords

Chords that are a subset of Bdim7. These contain less notes but all of them are included in Bdim7.

B 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 Bdim7 chord. Feel free to save or share the image as needed.

Piano chord chart for the B diminished seventh chord (Bdim7). The notes B, D, F and Ab are highlighted.