Practice A# dim Chord: Get Real-time Feedback on Your Guitar

A# dim position 1 guitar chord diagram

The A# diminished chord (A#dim) combines A#, C# and E, that is the root, minor third and flat five. A#dim is also the vii chord of B major, the diminished triad built on its seventh degree.

The A# Locrian scale contains all three chord tones, which makes it a reliable scale for soloing over A#dim. The listed voicings run from fret 1 up to fret 8. Seen from the other side, Bbdim names the same sound with the opposite accidentals.

Compared with a minor triad only one note changes: the fifth drops by a semitone. Press play in the chord player at the top of the page to hear A#dim strummed, then picked as an arpeggio.

A# diminished guitar chord is also written as A#dim, A#°, A#m(b5) or A#mb5.

A# dim chord Notes:

A# C# E

Chord Formula:

Formula: 1 b3 b5

A# Dim Chord Interactive Fretboard

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A# Dim Guitar Chord Diagrams

Position 1 Movable

A# dim position 1 guitar chord diagram

Finger Positions

  • Mute the low E string
  • Mute the high E string
  • Place your index finger (1) on the fret 1 of the A string
  • Place your middle finger (2) on the fret 2 of the D string
  • Place your ring finger (3) on the fret 3 of the G string
  • Place your pinky finger (4) on the fret 2 of the B string

Position 2 Movable

A# dim position 2 guitar chord diagram

Finger Positions

  • Mute the low E string
  • Mute the A string
  • Place your index finger (1) on the fret 5 of the B string
  • Place your middle finger (2) on the fret 6 of the high E string
  • Place your ring finger (3) on the fret 6 of the G string
  • Place your pinky finger (4) on the fret 8 of the D string

Position 3 Barre Movable

A# dim position 3 guitar chord diagram

Finger Positions

  • Mute the B string
  • Mute the high E string
  • Place your index finger (1) on the fret 6 of the low E and G strings at the same time
  • Place your middle finger (2) on the fret 7 of the A string
  • Place your ring finger (3) on the fret 8 of the D string

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Play This Chord With Other Roots

C dim | D dim | E dim | F dim | G dim | A dim | B dim | C#dim | D#dim | F#dim | G#dim | A#dim | Abdim | Bbdim | Dbdim | Ebdim | Gbdim

Giancarlo Facoetti, founder of FaChords Guitar

Created by

Giancarlo Facoetti

Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher

FAQ

Which notes make up the A# diminished chord?

A#dim is spelled A#, C# and E: the root, a minor third and a flat fifth. Each step between neighbouring notes is a minor third, three semitones, so the stack is perfectly regular.

Is A#dim the same chord as Bbdim?

Yes, they sound identical. A#dim and Bbdim are two spellings of the same pitches, and which one you read depends on the key. The A# spelling uses sharps, while Bb uses flats.

What is the vii chord role of A#dim in B major?

In B major, A#dim is the diminished triad on the seventh degree. Its notes A#, C# and E all belong to that key, which is why it feels like it wants to move toward B.

What scale fits A#dim for soloing?

The A# Locrian scale: A#, B, C#, D#, E, F#, G#. It holds all three chord tones, so any of those notes will agree with A#dim while the chord sounds.

How many A#dim voicings can be played on guitar?

There are 3 voicings in total, and 1 of them uses a barre. None uses an open string, and they span from fret 1 up to fret 8.