B diminished piano chord (Bdim)

A diminished chord stacks two minor thirds: root, minor third, diminished fifth. Tense and unstable, it is mostly used as a passing chord.

On the keyboard

Chord notes

NoteInterval
Broot
Dminor third
Fdiminished fifth

Formula: 1 – b3 – b5 · B – D – F

A progression with this chord

  1. Bdimvii°
  2. CI

The diminished chord works as a passing chord to the chord a semitone above.

Other B chords

The same chord on other roots