F Diminished
Introduction
Notes
F Diminished Inversions
| Position | Notes |
|---|---|
| Root Position | F4 – Ab4 – B4 |
| 1st Inversion | Ab4 – B4 – F5 |
| 2nd Inversion | B4 – F5 – Ab5 |
Key Signature
The key of F Diminished has 1 flat: B♭.
Theory: Intervals
The F Diminished is built by stacking intervals from the root note. The formula R-m3-d5 describes the scale degrees used. The intervals P1-m3-d5 show the distance between each note in the chord.
F Diminished — Frequently Asked Questions
What notes are in the F Diminished chord?
The F Diminished chord contains: F (root), Ab (minor third), and Cb (diminished fifth). Both intervals are compressed: the minor third is 3 semitones above the root, and the diminished fifth is 6 semitones — a tritone.
How does F Diminished differ from F Minor?
F Minor has a perfect fifth. F Diminished lowers the fifth by one semitone to Cb (diminished fifth). That extra compression creates intense harmonic tension — the tritone between root and diminished fifth is the most dissonant interval in Western music.
What is the symbol for the F Diminished?
F Diminished is written as Fdim or F°. The ° or "dim" symbol means both the third and fifth are minor/diminished. Do not confuse with Fdim7 or Fø (half-diminished), which include additional notes.
What are the inversions of F Diminished?
First inversion (F Diminished/Ab): Ab–Cb–F. Second inversion (F Diminished/Cb): Cb–F–Ab. Diminished triads are used in classical music as the vii° chord — the chord one semitone below the tonic, with strong resolution pull.
How is F Diminished used in music?
F Diminished most commonly functions as the vii° chord in a major key, creating strong resolution back to the tonic. It also works as a chromatic passing chord between two nearby chords, and in classical music as a brief point of dissonance. Jazz uses the full four-note dim7 more often than the triad.
What songs use diminished chords?
Michelle (Beatles) uses a diminished chord as a chromatic passing chord. Many classical pieces use vii°–I cadences. Jazz standards use dim7 chords as chromatic passing and approach chords. Diminished harmony also appears in flamenco and film music for dramatic tension.
Practice Tips
- Compare F Minor and F Diminished: only the fifth changes (Cb vs perfect fifth). Play both back to back — the extra compression is striking.
- The tritone between F and Cb creates maximum tension — practice just this two-note interval to hear its characteristic sound.
- F Diminished most naturally resolves up by half step: play Fdim then a chord whose root is F raised by one semitone.
- Practice all inversions: F–Ab–Cb, Ab–Cb–F, Cb–F–Ab.
- Use F Diminished as a vii° chord: it is one semitone below F# Major — try Fdim → F# Major to feel this powerful classical resolution.
- In a major key, find where F Diminished fits naturally as a passing chord between two diatonic chords a step apart.