This chord has 4 voicings across the fretboard. Use the arrows to see each shape and fingering — and tap any dot on the diagram to hear that note.
A#dim7 Guitar Chord
A fully diminished seventh. A#dim7 is symmetrical and mysterious.
Also known as
- A#°7
- Bb°7
- A# °7
- Bb °7
- Bbdim7
- A# dim7
- Bb dim7
- B-flat°7
- A-sharp°7
- B-flat °7
- A-sharp °7
- B-flatdim7
- A-sharpdim7
- B-flat dim7
- A-sharp dim7
- A# diminished 7th
- Bb diminished 7th
- A# diminished seventh
- Bb diminished seventh
- B-flat diminished 7th
- A-sharp diminished 7th
- B-flat diminished seventh
- A-sharp diminished seventh
How to Play This Chord
Position your fingers on the fretboard as shown in the diagram. The vertical lines represent the strings, from low E (left) to high E (right), and the horizontal lines are the frets. Numbers inside the dots indicate which finger to use: 1 (index), 2 (middle), 3 (ring), 4 (pinky). An X means don't play that string; an O means play it open. A bar spanning multiple strings means one finger presses across all of them at once — this is known as a barre chord.
Tips & Tricks
The symmetrical dim7 shape at the 1st fret is compact and accessible. This chord also equals C#dim7, Edim7, and Gdim7. It's often used in jazz as a chromatic approach to Bm7 or B major, creating smooth voice leading.