root position: Adim7
A – C – E♭ – G♭
Adim7 Piano Chord
The A diminished 7 chord (Adim7) is made of the notes A, C, E♭ and G♭. Its formula is 1 – ♭3 – ♭5 – 𝄫7.
Notes in Adim7
| Note | Formula | Interval from root |
|---|---|---|
| A | 1 | root |
| C | ♭3 | minor 3rd |
| E♭ | ♭5 | diminished 5th |
| G♭ | 𝄫7 | diminished 7th |
How to play Adim7 on piano
- Right hand: fingers 1-2-3-5
- Left hand: fingers 5-3-2-1
Fingers are numbered from the thumb (1) to the little finger (5).
Adim7 inversions
1st inversion: Adim7/C
C – E♭ – G♭ – A
2nd inversion: Adim7/Eb
E♭ – G♭ – A – C
3rd inversion: Adim7/Gb
G♭ – A – C – E♭
Other names for Adim7
Adim7 is also written as A°7.
Keys that contain Adim7
Adim7 is not one of the basic chords of any major or minor key. It is usually used as a passing or colour chord.