Learn › C Sharp Diminished 7th Chord on Piano (C#dim7)
New Released in April 2026
C Sharp Diminished 7th Chord on Piano (C#dim7)
To play C#dim7 on the piano, press C#, E, G, Bb together: root, minor third, flat fifth and diminished seventh. Take C#dim and add Bb. Below: the four positions, fingering, a three-note voicing and where C#dim7 goes next.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Where C#dim7 goes
- C#dim7 is the vii°7 chord of D minor: it pulls up one key, C#dim7 → D / Dm.
- Every note is three keys above the one before, so C#dim7, Edim7, Gdim7 and Bbdim7 use the same four keys.
- That even spacing is why C#dim7 sounds tense, dramatic and can lead to several different chords.
vii°7 → i: C#dim7 → Dm
C#dim7 inversions on the keyboard
Move C# up an octave for the 1st inversion, then E for the 2nd, then G for the 3rd.
Root position: C# E G Bb
1st inversion: E G Bb C#
2nd inversion: G Bb C# E
3rd inversion: Bb C# E G
How to practise C#dim7
- Play C#, E, G, Bb slowly in root position and say "C#dim7" each time.
- Climb the four positions: C# E G Bb, then E G Bb C#, G Bb C# E and Bb C# E G, and back down.
- Loop C#dim7 → Dm until the change into and out of C#dim7 is clean.
- Finally meet it in random order between other chords, with a check on every note.
A few minutes every day on C#dim7 beat one long session a week.
Four 7th chords on C#
Same root, same fifth: watch the third and the seventh.
How to play C#dim7 on the piano
| Hand | C# | E | G | Bb |
|---|---|---|---|---|
| Right hand | 1 (thumb) | 2 | 3 | 5 (little) |
| Left hand | 5 (little) | 3 | 2 | 1 (thumb) |
Too much stretch? Play C# alone in the left hand and E G Bb in the right.
A three-note C#dim7
Root, third, seventh: C# E Bb. It is the shape to learn first, and it moves smoothly to the next chord.
Train C#dim7 in a game
ChordRunner sends C#dim7 at you between other chords and checks every note you play. MIDI keyboard or microphone, both work.
Play the demoCommon questions
How do you play C#dim7 on the piano?
Press C#, E, G, Bb together. Right hand 1, 2, 3, 5 with the thumb on C#; any octave and any order of those notes is still C#dim7.
What are the inversions of C#dim7?
Root position C# E G Bb, 1st inversion E G Bb C#, 2nd inversion G Bb C# E and 3rd inversion Bb C# E G. Every position is still C#dim7.
Where does C#dim7 go?
C#dim7 is the vii°7 chord of D minor: it pulls up one key, C#dim7 → D / Dm. Every note is three keys above the one before, so C#dim7, Edim7, Gdim7 and Bbdim7 use the same four keys.
Can I practise C#dim7 with a MIDI keyboard?
Yes. In ChordRunner a USB MIDI keyboard is detected automatically, and an acoustic piano works through the microphone. C#dim7 counts in any inversion, as long as C#, E, G, Bb 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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