B° (Diminished)

B · D · F · 3 notes

Chord

Formula: R – ♭3 – ♭5

B R

D ♭3

F ♭5

Bass note: B

Key	Degree
C Major	vii°
A Minor	ii°

The B° chord is a diminished chord built on B. It consists of the notes B, D, F (scale degrees R, ♭3, ♭5).

Diminished chords stack two minor 3rds (3+3 semitones), creating a tense, unresolved sound. They typically appear as the vii° in major keys.

Use the Key Finder to find what key these notes belong to, or the Progression Builder to use this chord in a sequence.