D Diminished 7th
Hear the D Diminished 7th chord played for you.
D°7
D – F – G♯ – B
Formula:R-m3-d5-d7
Intervals:P1-m3-d5-d7
Scale Degrees:1-b3-b5-bb7
Introduction
The D Diminished 7th chord is a four-note chord made up of D, F, G♯, and B. It is built from a root, minor third, diminished fifth, and diminished seventh.
The D Diminished 7th piano chord (Ddim7) consists of the notes D, F, G#, B. It is built by stacking three minor thirds, creating a fully symmetrical 4-note chord, giving it a extremely tense and dramatic character, fully symmetrical and harmonically versatile. Formula: R-m3-d5-d7 | Scale degrees: 1-b3-b5-bb7.
Notes
D Diminished 7th Inversions
| Position | Notes |
|---|---|
| Root Position | D – F – G♯ – B |
| 1st Inversion | F – G♯ – B – D |
| 2nd Inversion | G♯ – B – D – F |
| 3rd Inversion | D – F – G♯ – B |
Key Signature
The key of D Diminished 7th has 2 sharps.
F♯C♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic: Father Charles Goes Down And Ends Battle
Chords in the Key of D Major
These are the diatonic triads built on each degree of the D major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — D Major (major)
Theory: Intervals
Formula: R-m3-d5-d7
Intervals: P1-m3-d5-d7
The D Diminished 7th is built by stacking intervals from the root note. The formula R-m3-d5-d7 describes the scale degrees used. The intervals P1-m3-d5-d7 show the distance between each note in the chord.
D Diminished 7th — Frequently Asked Questions
What notes are in the D Diminished 7th chord?
The D Diminished 7th chord (Ddim7) contains four notes: D (root), F (minor third), Ab (diminished fifth), and Cb (diminished seventh, enharmonically B). All four notes are spaced exactly 3 semitones apart.
How does D Diminished 7th differ from D Diminished?
D Diminished is a three-note triad (D, F, Ab). D Diminished 7th adds Cb/B (diminished seventh). This completes the symmetrical structure and increases harmonic tension. Dim7 is far more common in practice than the bare triad.
Why is the Diminished 7th chord symmetrical?
Every note in Ddim7 is exactly 3 semitones from the next: D–F (3), F–Ab (3), Ab–B (3), B–D (3). This means Ddim7 = Fdim7 = Abdim7 = Bdim7 — all the same four notes rearranged.
How is D Diminished 7th used in music?
Ddim7 commonly functions as a passing chord or leading-tone chord. As the vii°7 of Eb, it resolves up by half step to Eb Major. It also works beautifully as a chromatic passing chord between Dm and Em or between D and Eb.
What songs use Diminished 7th chords?
Diminished 7th chords appear in Michelle (Beatles), throughout Chopin and Beethoven for dramatic tension, and in jazz standards for chromatic voice leading. The dramatic quality made them a staple of silent film and horror scoring.
How many unique Diminished 7th chords exist?
Only three. Ddim7 is one of the three unique dim7 sounds. Ddim7 = Fdim7 = Abdim7 = Bdim7. Combined with Cdim7 and Dbdim7 groups, these three cover all 12 roots.
Practice Tips
- Play Ddim7 (D–F–Ab–B) and verify the symmetry: each note is 3 semitones from the next.
- Ddim7 sounds identical to Fdim7, Abdim7, and Bdim7 — play each inversion to confirm this.
- Use Ddim7 as a leading-tone chord: Ddim7 → Eb Major for a powerful half-step resolution.
- Practice as a passing chord: Dm7 → Ddim7 → Cm7 for smooth chromatic movement in a jazz context.
- Ddim7 is one of only three unique diminished 7th sounds — learning it covers four root names simultaneously.
- Try the classic dramatic effect: arpeggiate Ddim7 slowly with sustain pedal, then resolve — instant tension and release.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.