Learn › G Diminished 7th Chord on Piano (Gdim7)
New Released in April 2026
G Diminished 7th Chord on Piano (Gdim7)
The G diminished 7th chord (Gdim7) on the piano has four notes: G, Bb, Db, Fb. It is a Gdim triad with a diminished seventh, Fb, on top. Formula 1 b3 b5 bb7. Below: the four positions, fingering, a three-note voicing and where Gdim7 goes next.
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Gdim7 in keys and progressions
- Gdim7 is the vii°7 chord of Ab minor: it pulls up one key, Gdim7 → Ab / Abm.
- Every note is three keys above the one before, so Gdim7, Bbdim7, C#dim7 and Edim7 use the same four keys.
- That even spacing is why Gdim7 sounds tense, dramatic and can lead to several different chords.
- Fb is the same key as E.
vii°7 → i: Gdim7 → Abm
Gdim7 inversions on the keyboard
Move G up an octave for the 1st inversion, then Bb for the 2nd, then Db for the 3rd.
Root position: G Bb Db Fb
1st inversion: Bb Db Fb G
2nd inversion: Db Fb G Bb
3rd inversion: Fb G Bb Db
How to practise Gdim7
- Play G, Bb, Db, Fb slowly in root position and say "Gdim7" each time.
- Climb the four positions: G Bb Db Fb, then Bb Db Fb G, Db Fb G Bb and Fb G Bb Db, and back down.
- Play it in its ii-V-I, Gdim7 → Abm, four beats per chord.
- Then mix it with chords you already know, in an order you do not choose: that is where it sticks.
Short daily rounds fix Gdim7 in memory faster than one long practice a week.
Gdim7 compared with the other 7th chords on G
Same root, same fifth: watch the third and the seventh.
How to play Gdim7 on the piano
| Hand | G | Bb | Db | Fb |
|---|---|---|---|---|
| Right hand | 1 (thumb) | 2 | 3 | 5 (little) |
| Left hand | 5 (little) | 3 | 2 | 1 (thumb) |
Too much stretch? Play G alone in the left hand and Bb Db Fb in the right.
A three-note Gdim7
Root, third, seventh: G Bb Fb. It is the shape to learn first, and it moves smoothly to the next chord.
Train Gdim7 in a game
In ChordRunner Gdim7 and every other chord ride towards your runner: play them in time. MIDI keyboard or microphone, both work.
Play the demoCommon questions
What notes are in the G diminished 7th chord?
Gdim7 has four notes: G, Bb, Db, Fb. Root, minor third, diminished fifth and diminished seventh (formula 1 b3 b5 bb7).
What are the inversions of Gdim7?
Root position G Bb Db Fb, 1st inversion Bb Db Fb G, 2nd inversion Db Fb G Bb and 3rd inversion Fb G Bb Db. Every position is still Gdim7.
Where does Gdim7 go?
Gdim7 is the vii°7 chord of Ab minor: it pulls up one key, Gdim7 → Ab / Abm. Every note is three keys above the one before, so Gdim7, Bbdim7, C#dim7 and Edim7 use the same four keys.
Can I practise Gdim7 with a MIDI keyboard?
Yes. In ChordRunner a USB MIDI keyboard is detected automatically, and an acoustic piano works through the microphone. Gdim7 counts in any inversion, as long as G, Bb, Db, Fb sound together.
Your instrument is the controller.
ChordRunner is a browser game that teaches piano and guitar chords: a chord appears on screen, you play it on a real instrument, and your runner jumps. MIDI keyboard or microphone, both work.
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