F° (Diminished)

F · Ab · B · 3 notes

Chord

Formula: R – ♭3 – ♭5

F R

Ab ♭3

B ♭5

Bass note: F

Key	Degree
F# Major	vii°
D# Minor	ii°

The F° chord is a diminished chord built on F. It consists of the notes F, Ab, B (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.