The C♯ Diminished 7th chord is a four-note chord made up of C♯, E, G, and B♭. It is built from a root, minor third, diminished fifth, and diminished seventh.
Construction
C♯ Diminished 7th = Root + Minor 3rd + Diminished 5th + Major 6th = C♯ · E · G · B♭
| Note | Interval | Degree |
|---|---|---|
| C♯ | Root | 1 |
| E | Minor 3rd | ♭3 |
| G | Diminished 5th | ♭5 |
| B♭ | Major 6th | 6 |
C♯ Diminished 7th Inversions
| Position | Notes |
|---|---|
| Root Position | C♯ – E – G – B♭ |
| 1st Inversion | E – G – B♭ – C♯ |
| 2nd Inversion | G – B♭ – C♯ – E |
| 3rd Inversion | B♭ – C♯ – E – G |
Key Signature
A Diminished 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.
Same Notes, Other Names
The notes C♯ – E – G – B♭ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell the following:
C♯ Diminished 7th — Frequently Asked Questions
What is the C♯ Diminished 7th chord on piano?
The C♯ Diminished 7th chord contains the notes C♯ – E – G – B♭. On piano, play these notes together to sound the chord.
What notes are in the C# Diminished 7th chord?
C# Diminished 7th is built from the C# root. Check the interactive keyboard above for exact notes and fingering.
How is the C# Diminished 7th chord used in music?
C# Diminished 7th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Diminished 7th).
What is the fingering for C# Diminished 7th?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of C# Diminished 7th?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.