Cdim7 chord on ukulele

Cdim7 is C, E♭, G♭ and B𝄫. The usual shape is 2-3-2-3. Tap Play, then slow it down.

2-3-2-3 · movable · medium

Notes: C · E♭ · G♭ · B𝄫
Formula: 1 · ♭3 · ♭5 · ♭♭7
First shape: 2-3-2-3

How to play Cdim7 on ukulele

Shape 1, 2-3-2-3, reading from the G string on the left, starts at the 2nd fret:

Put your index finger on the G string at the 2nd fret, which is B𝄫.
Put your middle finger on the E string at the 2nd fret, which is G♭.
Put your ring finger on the C string at the 3rd fret, which is E♭.
Put your pinky finger on the A string at the 3rd fret, which is C.

The pinky takes a note here. Keep it curved and close to the fretboard between chords so it has less distance to travel.
On ukulele you strum all four strings. The top G string is tuned higher than the C, which is why ukulele chords sound bright and close.

Other ways to play Cdim7

5-6-5-6: movable shape at the 5th fret, medium. Same notes, stacked differently, so it sounds a little different.
8-9-8-9: movable shape at the 8th fret, medium. A high voicing for when the low version is taken by another instrument.
11-12-11-12: movable shape at the 11th fret, medium. Up the neck the chord gets thinner and brighter, a good contrast to the open version.

Cdim7 chord changes

The chords Cdim7 usually goes to, and what changes under your fingers.

C♯ (leads up a half step): Cdim7 (2-3-2-3) to C♯ (6-5-4-4): your index finger lands on the E string, 4th fret, your middle finger lands on the A string, 4th fret, move the ring finger to the C string, 5th fret. Everything moves: lift the whole hand and place the new shape in one go. C♯ on ukulele
C♯m (leads up a half step): Cdim7 (2-3-2-3) to C♯m (6-4-4-4): the index finger goes to the C string, 4th fret, the middle finger goes to the E string, 4th fret, your ring finger lands on the A string, 4th fret. Nothing carries over, so drill it slowly, lifting and landing all fingers at once. C♯m on ukulele
F (a fifth down): Cdim7 (2-3-2-3) to F (2-0-1-0): move the index finger to the E string, 1st fret, the middle finger goes to the G string, 2nd fret. The two chords share C and B𝄫, which is why the change sounds smooth. F on ukulele

Cdim7 is a diminished seventh: three minor thirds stacked, so the chord divides the octave into four equal parts. All 4 notes of Cdim7 fit on the ukulele's four strings. On ukulele you hear it best picked slowly, string by string.

Practice Cdim7 in two minutes

Pick shape 1 one string at a time, low to high: B𝄫, E♭, G♭, C. Every note should ring clearly; if one thuds, adjust that finger before you strum. Next, alternate 2-3-2-3 and 5-6-5-6, slowly, until the change takes less than a beat.

Keys and progressions with Cdim7

Cdim7 on guitar and piano

The same notes on another instrument: Cdim7 on guitar and Cdim7 on piano. This page puts all three side by side.

Close to Cdim7

Other diminished seventh chords

Cdim7 on ukulele: questions

What notes are in Cdim7 on ukulele?

C, E♭, G♭ and B𝄫. In the 2-3-2-3 shape the strings play B𝄫 (G string), E♭ (C string), G♭ (E string) and C (A string).

What's the easiest way to play Cdim7 on ukulele?

In standard tuning Cdim7 can't use open strings. Begin with 2-3-2-3. It uses 4 fingers and no barre, and in many songs a capo can take over part of the work.

Is Cdim7 a barre chord on ukulele?

Not the usual shape: 2-3-2-3 needs no barre.

Which string does Cdim7 start on?

In the 2-3-2-3 shape the lowest string you play is the G string at the 2nd fret, which is B𝄫, the diminished seventh.

Every shape above plays only C, E♭, G♭ and B𝄫, checked by the site's tests. Updated September 2026.