C#dim7 Verminderter Septakkord Akkord

Four notes stacked in minor thirds. Extremely tense, used as a passing chord.

C#dim7 Akkord — Quick Answer & Harmonic Definition

The C#dim7 (Diminished 7th) chord consists of the notes C#, E, G, A#. It is constructed from the root note C# using the diminished 7th interval formula (0–3–6–9 semitones).

Formula: 0 – 3 – 6 – 9
Notes
C# – E – G – A#
Intervals (semitones)
0 – 3 – 6 – 9
Type
7th Chord

C#dim7 on Piano

Press highlighted keys simultaneously to play the C#dim7 chord.

R
C# (Root (R))
2
E (Minor 3rd (♭3))
3
G (Tritone (♭5))
4
A# (Major 6th / Dim 7th)

C#dim7 on Guitar

The C#dim7 chord uses notes C#, E, G, A#. Build a voicing by finding these notes on any strings — root on the 6th string is a common starting point for barre chord shapes.

Interval Analysis

Degree Interval Name Semitones Note in C#
Root Root (R) 0 C#
3rd Minor 3rd (♭3) 3 E
5th Tritone (♭5) 6 G
7th Major 6th / Dim 7th 9 A#

About the C# Verminderter Septakkord Chord

The C#dim7 chord (C# Verminderter Septakkord) consists of 4 notes: C#, E, G, A#. Four notes stacked in minor thirds. Extremely tense, used as a passing chord.

To build any diminished 7th chord, apply intervals of 0, 3, 6, 9 semitones above the root. Starting from C#: the notes land on C#, E, G, A#.

Playing C#dim7 on Piano

Press C#, E, G, A# simultaneously. In root position, C# is lowest. First inversion places E in the bass for a lighter sound; second inversion uses G as the bass note.

Common Chord Progressions Using C#dim7

  • I–IV–V: C#dim7 – F#dim7 – G#dim7 (blues and rock)
  • I–V–vi–IV: C#dim7 – G# – A#m – F# (pop staple)
  • I–vi–IV–V: C#dim7 – A#m – F# – G# (50s progression)

The C#dim7 Chord in Context

The C#dim7 (Verminderter Septakkord) chord features a distinctive four notes stacked in minor thirds. extremely tense, used as a passing chord. built from the intervals 0–3–6–9. It provides rich harmonic color and tension across pop, jazz, classical, and contemporary compositions.

Other C# Chords

C#
Major
C#m
Minor
C#7
Dominant 7th
C#maj7
Major 7th
C#m7
Minor 7th
C#dim
Diminished

Verminderter Septakkord Chord in All 12 Keys

Cdim7 C#dim7 Ddim7 D#dim7 Edim7 Fdim7 F#dim7 Gdim7 G#dim7 Adim7 A#dim7 Bdim7
Virtual Piano
Play C#dim7 on piano
Virtual Guitar
See on the fretboard
C# Scale
Notes that fit C#dim7
Songs
Find songs using C#dim7

Knowledge Base & FAQs

C#dim7 Chord — Frequently Asked Questions

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

What notes are in the C#dim7 chord?

The C# Verminderter Septakkord chord contains: C#, E, G, A#.

These notes are derived by applying the diminished 7th interval formula (0–3–6–9 semitones) to the root note C#.

What is the C#dim7 chord used for?

Four notes stacked in minor thirds.

Extremely tense, used as a passing chord. The C#dim7 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of C# major, it functions as the most stable resting point in progressions.

How do you play C#dim7 on piano?

On piano, play C#, E, G, A# simultaneously.

In root position, C# is the lowest note. Inversions move the bass note up — first inversion has E lowest, second inversion has G lowest.

How many notes are in a diminished 7th chord?

A diminished 7th chord has 4 notes: C#, E, G, A# (in C#).

It is a 7th chord, extending beyond the basic triad.

What is the difference between C# major and C# minor?

The C# major chord (C#–F–G#) uses a major third (4 semitones), giving it a bright, happy sound.

The C# minor chord (C#–E–G#) uses a minor third (3 semitones), giving it a darker, emotional sound.

What key does C#dim7 belong to?

C#dim7 naturally serves as the I chord in the key of C# major.

It also appears as IV in the key of G# major, and as V in the key of F# major.

Can I play C#dim7 on ukulele?

Yes.

The ukulele uses GCEA tuning with 4 strings. The C#dim7 chord notes (C#, E, G, A#) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

What chords go well with C#dim7?

In the key of C# major, C#dim7 pairs naturally with F# major (IV), G# major (V), and A#m (vi).

The classic I–IV–V (C#dim7–F#–G#) is the foundation of blues, country, and rock.

What is a chord inversion of C#dim7?

An inversion places a non-root note in the bass.

C#dim7 root position: C# in bass. First inversion: E in bass. Second inversion: G in bass. Inversions create smoother bass line movement without changing the harmony.

How do I memorize the notes in a diminished 7th chord?

Remember the formula: 0–3–6–9 semitones from root.

For C#dim7: start on C#, add 3 semitones, then 6 semitones, then 9 semitones. Practicing this across all 12 roots builds instant recognition of any diminished 7th chord.