The A♯ Diminished 7th chord is a four-note chord made up of A♯, C♯, E, and G. It is built from a root, minor third, diminished fifth, and diminished seventh.
Construction
A♯ Diminished 7th = Root + Minor 3rd + Diminished 5th + Major 6th = A♯ · C♯ · E · G
| Note | Interval | Degree |
|---|---|---|
| A♯ | Root | 1 |
| C♯ | Minor 3rd | ♭3 |
| E | Diminished 5th | ♭5 |
| G | Major 6th | 6 |
A♯ Diminished 7th Inversions
| Position | Notes |
|---|---|
| Root Position | A♯ – C♯ – E – G |
| 1st Inversion | C♯ – E – G – A♯ |
| 2nd Inversion | E – G – A♯ – C♯ |
| 3rd Inversion | G – A♯ – C♯ – E |
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 A♯ – C♯ – E – G 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:
A♯ Diminished 7th — Frequently Asked Questions
What is the A♯ Diminished 7th chord on piano?
The A♯ Diminished 7th chord contains the notes A♯ – C♯ – E – G. On piano, play these notes together to sound the chord.
What notes are in the A# Diminished 7th chord?
A# Diminished 7th is built from the A# root. Check the interactive keyboard above for exact notes and fingering.
How is the A# Diminished 7th chord used in music?
A# Diminished 7th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Diminished 7th).
What is the fingering for A# 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 A# Diminished 7th?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.