A#dim7 / Bbdim7 Guitar Chord
A#dim7 (also written Bbdim7) is a diminished seventh chord. It is built from stacked minor thirds, so moving the same shape three frets up or down gives the same four notes. It is often used as a passing chord. Its notes are A#, C#, E and G. Below is one way to play it, with a chord diagram, tab and finger numbers.
Notes in A#dim7 / Bbdim7
A#dim7 and Bbdim7 are two names for the same chord. The notes below are spelled as A#dim7.
| Note | Degree | Interval |
|---|---|---|
| A# | R | Root |
| C# | b3 | Minor 3rd |
| E | b5 | Diminished 5th |
| G | bb7 | Diminished 7th |
Formula: 1–b3–b5–bb7
A#dim7 / Bbdim7 chord shapes
Finger numbers: 1 index, 2 middle, 3 ring, 4 pinky. In the tab, x means don't play that string and 0 means play it open. In the diagrams the top line is the 1st (thinnest) string and the nut is on the left.
Dim shape 1fr
Easiest- Tab (6th → 1st string)
- x 1 2 0 2 x
- Fingers
- – 1 2 – 3 –
How to play A#dim7 / Bbdim7 (easiest shape)
Shape: Dim shape 1fr, tab x 1 2 0 2 x (6th to 1st string).
- 1Put your index finger (1) on the 5th string at the 1st fret.
- 2Put your middle finger (2) on the 4th string at the 2nd fret.
- 3Put your ring finger (3) on the 2nd string at the 2nd fret.
- 4Let the 3rd string ring open.
- 5Don't play the 6th string.
- 6Keep the 1st string quiet: stop your strum at the 2nd string, or let a fretting finger touch it lightly.
- 7Strum down from the 5th string to the 2nd string.
A#dim7 / Bbdim7: common questions
- What notes are in the A#dim7 / Bbdim7 chord?
- A#dim7 and Bbdim7 are two names for the same chord. Spelled as A#dim7, it has 4 notes: A#, C#, E and G. Counted from the root, that is 1–b3–b5–bb7.
- Is there an easier way to play A#dim7 / Bbdim7?
- The easiest shape on this page is "Dim shape 1fr" (x 1 2 0 2 x). It needs no barre: each finger presses just one string.
Related chords
Other A#/Bb chords
Same chord type, other roots
More guitar tools
See all 231 chords in the chord library, find a scale to play over them, or tune up before you start.