Gdim7 chord
Gdim7 is G, B♭, D♭ and F♭: 1–♭3–♭5–♭♭7 built on G. See and hear it on all three instruments below.
On guitar
3-1-2-0-2-0 · open · medium
- Notes
- G · B♭ · D♭ · F♭
- Formula
- 1 · ♭3 · ♭5 · ♭♭7
- First shape
- 3-1-2-0-2-0
Gdim7 on guitar: every shape, finger by finger
On piano
root position · G–B♭–D♭–F♭ · right hand 1-2-3-5
- Notes
- G · B♭ · D♭ · F♭
- Formula
- 1 · ♭3 · ♭5 · ♭♭7
Gdim7 on piano: fingering and inversions
On ukulele
0-1-0-1 · open · easy
- Notes
- G · B♭ · D♭ · F♭
- Formula
- 1 · ♭3 · ♭5 · ♭♭7
- First shape
- 0-1-0-1
Changing out of Gdim7
The moves below are the ones you'll meet most, shown for guitar and piano.
- Gdim7 → A♭ (leads up a half step)
Guitar: Gdim7 (3-1-2-0-2-0) to A♭ (4-6-6-5-4-4): the index finger lays across the low E to high E strings at the 4th fret, your middle finger lands on the G string, 5th fret, the ring finger goes to the A string, 6th fret. Everything moves: lift the whole hand and place the new shape in one go.
Piano: Gdim7 to A♭: play A♭ in root position (A♭–C–E♭), while G moves up to A♭, D♭ down to C and F♭ down to E♭. A♭ - Gdim7 → G♯m (leads up a half step)
Guitar: Gdim7 (3-1-2-0-2-0) to G♯m (4-6-6-4-4-4): the index finger lays across the low E to high E strings at the 4th fret, the middle finger goes to the A string, 6th fret, your ring finger lands on the D string, 6th fret. Everything moves: lift the whole hand and place the new shape in one go.
Piano: Gdim7 to G♯m: play G♯m in root position (G♯–B–D♯), while G moves up to G♯, B♭ up to B and F♭ down to D♯. G♯m - Gdim7 → C (a fifth down)
Guitar: Gdim7 (3-1-2-0-2-0) to C (x-3-2-0-1-0): your middle finger stays put, move the index finger to the B string, 1st fret, the ring finger goes to the A string, 3rd fret. Shared notes: G and F♭.
Piano: Gdim7 to C: play C in 2nd inversion (G–C–E) and G and E stay under the same fingers, while D♭ moves down to C. C
How Gdim7 is built
Gdim7 is a diminished seventh: three minor thirds stacked, so the chord divides the octave into four equal parts. That symmetry means Gdim7 contains exactly the same four notes as A♯dim7, C♯dim7 and Edim7; which name you use depends on the bass note and the key.
Start on G, count 3 half steps up to B♭, 3 half steps up to D♭ then 3 half steps up to F♭.
| Note | Role | Half steps | Hear it |
|---|---|---|---|
| G | root | 0 | |
| B♭ | minor third | 3 | |
| D♭ | diminished fifth | 6 | |
| F♭ | diminished seventh | 9 |
Keys and progressions with Gdim7
No major or natural minor key contains Gdim7 as one of its own chords; it turns up as a passing chord on the way somewhere else.
Chords close to Gdim7
- Gdim7 is Gdim plus F♭. Gdim
Chords that share most of their notes with Gdim7: C♯dim7, Edim7, A♯dim7, C♯dim, Edim, Gdim.
Every G chord
Gdim7 chord: questions
What notes are in the Gdim7 chord?
G, B♭, D♭ and F♭. Gdim7 is built 1–♭3–♭5–♭♭7 from G: B♭ is the minor third, D♭ is the diminished fifth and F♭ is the diminished seventh.
How do you play Gdim7 on guitar?
The usual shape is 3-1-2-0-2-0 (open). All 4 guitar shapes.
How do you play Gdim7 on piano?
Play G, B♭, D♭ and F♭ with right-hand fingers 1-2-3-5. G sits between the first two black keys of the three. Inversions and left hand.
How do you play Gdim7 on ukulele?
0-1-0-1 in standard GCEA tuning. More ukulele shapes.
What key is Gdim7 in?
No major or natural minor key contains Gdim7 as one of its own chords; it turns up as a passing chord on the way somewhere else.
What's the difference between Gdim7 and Gdim?
Gdim7 is Gdim plus F♭.
Every diagram on this page is generated from the notes G, B♭, D♭ and F♭ and checked automatically so the sound matches the drawing. Updated September 2026.