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B Diminished 7th Chord (Bdim7)

Notes: B, D, F, A♭. Tap any diagram to hear it.

Bdim7
Notes
BDFA♭
Formula
1 – ♭3 – ♭5 – 𝄫7

Bdim7 on guitar

Open position · most common
x-2-0-1-0-1
Fret 7
7-8-9-7-9-7
Fret 4
7-5-0-4-6-4

Strings from low (left) to high (right). Numbers are fingers: 1 index, 2 middle, 3 ring, 4 pinky. × = don’t play, ○ = open string.

Bdim7 on ukulele

Fret 1 · most common
1-2-1-2
Fret 4
4-5-4-5
Fret 7
7-8-7-8

Bdim7 on piano

Other B chords

BBmB7Bmaj7Bm7Bsus2Bsus4BdimBaugB6Bm6B9Badd9B7sus4Bm7♭5

Diminished 7th chords in other keys

Cdim7C♯dim7Ddim7E♭dim7Edim7Fdim7F♯dim7Gdim7A♭dim7Adim7B♭dim7

About the B Diminished 7th chord

Diminished seventh chords stack minor thirds all the way up, so the same shape repeats every three frets. They create strong, dramatic tension. Bdim7 is built from the root (B), minor third (D), diminished fifth (F), diminished seventh (A♭).

Frequently asked questions

What notes are in the B Diminished 7th chord?

The Bdim7 chord is made of B, D, F, A♭: the root, minor third, diminished fifth, diminished seventh.

How do you play Bdim7 on guitar?

The most common fingering is x-2-0-1-0-1, from the low E string to the high E string (x = don’t play that string, 0 = open string).

How do you play Bdim7 on piano?

Press B, D, F, A♭ together. In root position the lowest note is B.