Piano chord · also written B♭dim7

A♯ Diminished 7th Piano Chord (A♯dim7)

The A♯ Diminished 7th chord on piano is made of the notes A♯, C♯, E and G. Highly tense and symmetrical. Every note is 3 semitones apart.

A♯ Diminished 7th chord on a piano keyboard: A♯, C♯, E, G C5C6 A♯ C♯ E G

A♯dim7 A♯ – C♯ – E – G

Tap any key to hear it.

Name any chord from its keys in the chord finder →

What notes are in A♯ Diminished 7th?

4 notes, built 1 – ♭3 – ♭5 – ♭♭7 up from A♯.

Notes
A♯ – C♯ – E – G
Formula
1 – ♭3 – ♭5 – ♭♭7
Semitones from the root
0 – 3 – 6 – 9
Symbol
A♯dim7
Same keys as
B♭dim7 (B♭ – D♭ – F♭ – G)
Chord type
Diminished 7th, 4 notes

How to play A♯ Diminished 7th on piano

  • Right hand: A♯ (1), C♯ (2), E (3), G (5). Fingers 1 – 2 – 3 – 5, thumb on A♯.
  • Left hand: A♯ (5), C♯ (3), E (2), G (1). Fingers 5 – 3 – 2 – 1, little finger on A♯.

Fingers are numbered 1 (thumb) to 5 (little finger) on both hands.

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A♯ Diminished 7th inversions

Each inversion puts a different note of the chord in the bass. Written as a slash chord: A♯dim7/C♯, A♯dim7/E, A♯dim7/G.

A♯ Diminished 7th root position on piano: A♯, C♯, E, G A♯ C♯ E G
Root position A♯dim7 A♯ – C♯ – E – G RH 1 – 2 – 3 – 5 · LH 5 – 3 – 2 – 1
A♯ Diminished 7th 1st inversion on piano: C♯, E, G, A♯ C♯ E G A♯
1st inversion A♯dim7/C♯ C♯ – E – G – A♯ RH 1 – 2 – 3 – 5 · LH 5 – 3 – 2 – 1
A♯ Diminished 7th 2nd inversion on piano: E, G, A♯, C♯ E G A♯ C♯
2nd inversion A♯dim7/E E – G – A♯ – C♯ RH 1 – 2 – 3 – 5 · LH 5 – 3 – 2 – 1
A♯ Diminished 7th 3rd inversion on piano: G, A♯, C♯, E G A♯ C♯ E
3rd inversion A♯dim7/G G – A♯ – C♯ – E RH 1 – 2 – 3 – 5 · LH 5 – 3 – 2 – 1

Progressions with A♯ Diminished 7th

Press play: the chords move across the keyboard as they sound, voiced so your hand barely moves.

Passing diminished

in A major

  1. I A
  2. ♯i°7 A♯dim7
  3. ii Bm
  4. V7 E7
Passing diminished in A major: A, A♯dim7, Bm, E7 C♯ E A

Diminished resolution

in B minor

  1. iv Em
  2. vii°7 A♯dim7
  3. i Bm
Diminished resolution in B minor: Em, A♯dim7, Bm B E G

Can you find A♯ Diminished 7th?

Tap the notes on the keyboard, then check. Six chords, starting with this one.

1 / 6 Tap the notes of A♯ Diminished 7th (A♯dim7)

Score 0

Any octave, any order. Each key you tap plays.

Practice keyboard: tap the notes of the chord

What key is A♯ Diminished 7th in?

The keys whose scale contains every note of A♯dim7, with the chord’s Roman numeral in each.

Minor keys

  • B minorvii°7 (harmonic minor)

A♯ Diminished 7th chord FAQ

What notes are in the A♯ Diminished 7th chord?

A♯ Diminished 7th (A♯dim7) has 4 notes: A♯, C♯, E and G. Its formula is 1 – ♭3 – ♭5 – ♭♭7, counted up from A♯.

How do you play A♯ Diminished 7th on the piano?

Put your right thumb on A♯ and play A♯, C♯, E and G with fingers 1 – 2 – 3 – 5. With the left hand, use fingers 5 – 3 – 2 – 1, little finger on A♯.

Is A♯ Diminished 7th the same as B♭ Diminished 7th?

On the piano, yes: B♭dim7 (B♭, D♭, F♭, G) uses exactly the same keys as A♯dim7 (A♯, C♯, E, G). Which name is used depends on the key of the piece; A♯dim7 is the more common spelling.

What are the inversions of A♯ Diminished 7th?

1st inversion: C♯, E, G, A♯ (A♯dim7/C♯). 2nd inversion: E, G, A♯, C♯ (A♯dim7/E). 3rd inversion: G, A♯, C♯, E (A♯dim7/G).

Other A♯ chords

Diminished 7th chords on every root

Piano chord chart: all 264 chords Open A♯dim7 in the chord finder Free PDF chord chart Play it on the virtual piano