Learn › F Sharp Diminished 7th Chord on Piano (F#dim7)
New Released in April 2026
F Sharp Diminished 7th Chord on Piano (F#dim7)
F#dim7, the F sharp diminished 7th chord, stacks A, C and Eb on top of F#. Four keys, formula 1 b3 b5 bb7: the F#dim triad plus Eb. Below: the four positions, fingering, a three-note voicing and where F#dim7 goes next.
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- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Playing F#dim7 with each hand
| Hand | F# | A | C | Eb |
|---|---|---|---|---|
| Right hand | 1 (thumb) | 2 | 3 | 5 (little) |
| Left hand | 5 (little) | 3 | 2 | 1 (thumb) |
Play F#dim7 broken first, F#, A, C, Eb one by one, then together: a wrong key stands out.
A three-note F#dim7
The fifth (C) adds little colour. F# A Eb is enough to sound like F#dim7 and is far easier to reach.
Learning F#dim7 step by step
- Play F#, A, C, Eb slowly in root position and say "F#dim7" each time.
- Climb the four positions: F# A C Eb, then A C Eb F#, C Eb F# A and Eb F# A C, and back down.
- Play it in its ii-V-I, F#dim7 → Gm, 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 F#dim7 in memory faster than one long practice a week.
How F#dim7 differs from the other 7th chords on F#
Same root, same fifth: watch the third and the seventh.
Four ways to play F#dim7
In the 3rd inversion Eb is the lowest note: the seventh in the bass.
Root position: F# A C Eb
1st inversion: A C Eb F#
2nd inversion: C Eb F# A
3rd inversion: Eb F# A C
F#dim7 in keys and progressions
- F#dim7 is the vii°7 chord of G minor: it pulls up one key, F#dim7 → G / Gm.
- Every note is three keys above the one before, so F#dim7, Adim7, Cdim7 and Ebdim7 use the same four keys.
- That even spacing is why F#dim7 sounds tense, dramatic and can lead to several different chords.
vii°7 → i: F#dim7 → Gm
Practise F#dim7 by playing
ChordRunner sends F#dim7 at you between other chords and checks every note you play. MIDI keyboard or microphone, both work.
Play the demoCommon questions
What is the difference between F#dim7 and F#dim?
F#dim7 adds one note to the F#dim triad: Eb, the diminished seventh. That fourth note is what makes it a seventh chord.
What are the inversions of F#dim7?
Root position F# A C Eb, 1st inversion A C Eb F#, 2nd inversion C Eb F# A and 3rd inversion Eb F# A C. Every position is still F#dim7.
Where does F#dim7 go?
F#dim7 is the vii°7 chord of G minor: it pulls up one key, F#dim7 → G / Gm. Every note is three keys above the one before, so F#dim7, Adim7, Cdim7 and Ebdim7 use the same four keys.
Can I practise F#dim7 with a MIDI keyboard?
Yes. In ChordRunner a USB MIDI keyboard is detected automatically, and an acoustic piano works through the microphone. F#dim7 counts in any inversion, as long as F#, A, C, Eb 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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