Chord · 7ths
Adim7 — A Diminished 7th
Adim7 is the A diminished 7th chord. It is built on the root A with minor 3rd (C), diminished 5th (E♭) and diminished 7th (G♭) above it — the formula 1 ♭3 ♭5 𝄫7, sounding the notes A C E♭ G♭. On the piano it sits at A (octave 3) and above in the library's voicing; the same 4 notes in any octave are still Adim7.
- Root
- A
- Quality
- Diminished 7th
- Formula
- 1 ♭3 ♭5 𝄫7
- Notes
- A C E♭ G♭
On the keyboard
Right-hand fingering for this voicing: 1–2–3–5 (1 is the thumb).
The notes of Adim7
| Degree | Note | Interval from the root | Pitch |
|---|---|---|---|
| 1 | A | root | A3 |
| ♭3 | C | minor 3rd | C4 |
| ♭5 | E♭ | diminished 5th | E♭4 |
| 𝄫7 | G♭ | diminished 7th | G♭4 |
Other 7ths on A
Diminished 7th chords on every root
Part of the chord reference. See also the scales and the keys.