Edim7 — E diminished seventh chord

Four notes each a minor third above the last, so the octave is divided into four equal parts. Every note of the chord can act as the root, which gives the chord four spellings for one set of notes.

1 = E
b3 = G
b5 = Bb
bb7 = Db

Symbol: Edim7
Root: E
Quality: Diminished seventh
Family: seventh
Notes: E G Bb Db
Degree formula: 1 b3 b5 bb7
Semitones from the root: 0 3 6 9
Distinct pitch classes: 4
Interval structure: Stacked from the root: 3 semitones, 3 semitones, 3 semitones
Notation: Written dim7 or o7. Functions as an altered dominant a semitone below the target chord.
Key: E · E major / C# minor key signature

Formula

The chord tones in order from the root, with the interval each one forms above it.

Degree	Note	Semitones	Interval from the root
1	E	0	Perfect unison
b3	G	3	Minor third
b5	Bb	6	Tritone
bb7	Db	9	Major sixth

Degree

Note

Semitones

Interval from the root

Perfect unison

Minor third

Tritone

bb7

Major sixth

Inversions

An inversion is the same set of notes with a different one in the bass. The last column gives the distance of each note above the bass note, in semitones.

Inversion	Bass note	Degree in the bass	Notes above the bass	Semitones above the bass
root position	E	1	E – G – Bb – Db	0 3 6 9
first inversion	G	b3	G – Bb – Db – E	0 3 6 9
second inversion	Bb	b5	Bb – Db – E – G	0 3 6 9
third inversion	Db	bb7	Db – E – G – Bb	0 3 6 9

Inversion

Bass note

Degree in the bass

Notes above the bass

Semitones above the bass

root position

E – G – Bb – Db

0 3 6 9

first inversion

G – Bb – Db – E

0 3 6 9

second inversion

Bb – Db – E – G

0 3 6 9

third inversion

bb7

Db – E – G – Bb

0 3 6 9

Playable voicings

These shapes were found by searching the fretboard of a standard-tuned guitar (E A D G B E) rather than copied from a chord book. The search allows every string to sound or to be muted, rejects any shape with a muted string between two sounding strings, rejects any shape whose fretted notes span more than four frets (a five-fret window), requires every chord tone to be present, and then sorts what remains with root-position shapes first and the most compact, lowest shapes next. The shapes shown are the first six of that ordering; other orderings are possible at the same frets.

#	Shape (low string first)	Notes	Degrees	Bass	Span (frets)	Sounding strings
1	0-1-2-0-2-0 (6→1)	E A# E G C# E	1 b5 1 b3 bb7 1	E	2	6
2	12-10-11-12-11-12 (6→1)	E G C# G A# E	1 b3 bb7 b3 b5 1	E	2	6
3	12-13-11-12-11-12 (6→1)	E A# C# G A# E	1 b5 bb7 b3 b5 1	E	2	6
4	12-13-14-12-14-12 (6→1)	E A# E G C# E	1 b5 1 b3 bb7 1	E	2	6
5	0-1-2-0-2-3 (6→1)	E A# E G C# G	1 b5 1 b3 bb7 b3	E	3	6
6	0-1-2-3-2-3 (6→1)	E A# E A# C# G	1 b5 1 b5 bb7 b3	E	3	6

Shape numbers run from the lowest string to the highest, so the left-hand number is the sixth string (low E) in standard tuning. Multiple shapes are listed because a chord can be voiced several ways, and because a lower position is not always the better sounding one.

Related chords and scales

KeyEverything in Escale, chords and neck map for this root
ScaleE diminished (whole-half)the scale this chord comes from
ChordGdim7same four notes, a different note in the bass
ChordBbdim7same four notes, a different note in the bass
ChordC#dim7same four notes, a different note in the bass

Everything in E · All chords

KeyKey of EE F# G# A B C# D# · E major / C# minor
ScaleE diminished (whole-half)8 notes · 1 2 b3 4 b5 b6 6 7
ChordGdim7 — Diminished seventh1 b3 b5 bb7 · G Bb Db Fb
ChordBbdim7 — Diminished seventh1 b3 b5 bb7 · Bb Db Fb Abb
ChordC#dim7 — Diminished seventh1 b3 b5 bb7 · C# E G Bb
ChordE7 — Dominant seventh1 3 5 b7 · E G# B D
ChordEmaj7 — Major seventh1 3 5 7 · E G# B D#
ChordEm7 — Minor seventh1 b3 5 b7 · E G B D

Everything in this key: E · Chords · Theory Atlas