Explore and Master the B dim7 Guitar Chord
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The B diminished seventh chord, written Bdim7, is spelled B, D, F and Ab: the root, minor third, flat five and diminished seventh. In C harmonic minor, the diminished seventh on the seventh degree is Bdim7.
Bdim7 is the diatonic vii chord of C harmonic minor, and the C harmonic minor scale contains all four of its notes. The page lists 7 voicings: one rings an open string and 2 are barre shapes. The fretboard interval patterns in our theory guide show how note distances look across the strings.
Compared with the diminished triad it adds one more minor third on top, a diminished seventh above the root. In the chord player at the top, each shape comes with its note names labelled on the fretboard.
B diminished 7th guitar chord is also written as Bdim7, B°7 or Bo7. It is also known as the B fully diminished seventh chord.
Notes of the B dim7 chord:
Chord Formula:
Formula: 1 b3 b5 bb7
B Dim7 Guitar Chord Diagrams
Position 1 Movable
Finger Positions
- Mute the B string
- Mute the high E string
- Place your index finger (1) on the fret 3 of the D string
- Place your middle finger (2) on the fret 4 of the low E string
- Place your ring finger (3) on the fret 4 of the G string
- Place your pinky finger (4) on the fret 5 of the A string
Position 2 Movable
Finger Positions
- Mute the low E string
- Mute the high E string
- Place your index finger (1) on the fret 4 of the G string
- Place your middle finger (2) on the fret 5 of the A string
- Place your ring finger (3) on the fret 6 of the D string
- Place your pinky finger (4) on the fret 6 of the B string
Position 3 Movable
Finger Positions
- Mute the low E string
- Mute the A string
- Place your index finger (1) on the fret 9 of the D string
- Place your middle finger (2) on the fret 9 of the B string
- Place your ring finger (3) on the fret 10 of the G string
- Place your pinky finger (4) on the fret 10 of the high E string
Position 4 Movable
Finger Positions
- Mute the low E string
- Mute the high E string
- Place your index finger (1) on the fret 1 of the G string
- Place your middle finger (2) on the fret 2 of the A string
- Place your ring finger (3) on the fret 3 of the D string
- Place your pinky finger (4) on the fret 3 of the B string
Position 5 Barre Movable
Finger Positions
- Mute the low E string
- Mute the A string
- Place your index finger (1) on the fret 6 of the D and B strings at the same time
- Place your middle finger (2) on the fret 7 of the G string
- Place your ring finger (3) on the fret 7 of the high E string
Position 6 Barre Movable
Finger Positions
- Mute the A string
- Mute the high E string
- Place your index finger (1) on the fret 6 of the D and B strings at the same time
- Place your middle finger (2) on the fret 7 of the low E string
- Place your ring finger (3) on the fret 7 of the G string
Position 7 Open
Finger Positions
- Mute the low E string
- Mute the A string
- Let the D string play without pressing any fret
- Let the B string play without pressing any fret
- Place your ring finger (3) on the fret 1 of the G string
- Place your pinky finger (4) on the fret 1 of the high E string
Find more shapes in our all guitar chords online library. If you
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Created by
Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher
FAQ
Which notes are in Bdim7?
Bdim7 contains B, D, F and Ab. It is built from the root, minor third, flat fifth and diminished seventh. Ab sounds like G#, nine semitones from B.
Why is the top note of Bdim7 an Ab and not a G#?
The seventh of B falls on the letter A. A minor seventh would be A natural, and a diminished seventh is one semitone lower, Ab. It sounds like G#.
What distinguishes B diminished seventh from B diminished?
The B diminished triad is B, D and F. The seventh chord adds Ab, which gives it a symmetrical sound made of three stacked minor thirds.
Which scale fits Bdim7?
The B whole-half scale contains all four chord tones. Its notes are B, C#, D, E, F, G, G#, A#, so you can improvise inside it.
Where is Bdim7 the vii chord?
Bdim7 is the vii chord of C harmonic minor. It is built on the raised seventh degree and leads toward C minor.
How many Bdim7 voicings does guitar have?
There are 7 voicings, with 1 using an open string and 2 using a barre. They run from fret 1 up to fret 10.
