C#m7b5 Piano Chord

The C sharp half-diminished 7 chord (C♯m7♭5) is made of the notes C♯, E, G and B. Its formula is 1 – ♭3 – ♭5 – ♭7.

Tap the keyboard to hear C♯m7♭5.

Notes in C♯m7♭5

Note	Formula	Interval from root
C♯	1	root
E	♭3	minor 3rd
G	♭5	diminished 5th
B	♭7	minor 7th

How to play C♯m7♭5 on piano

Right hand: fingers 1-2-3-5
Left hand: fingers 5-3-2-1

Fingers are numbered from the thumb (1) to the little finger (5).

C♯m7♭5 inversions

root position: C#m7b5

C♯ – E – G – B

1st inversion: C#m7b5/E

E – G – B – C♯

2nd inversion: C#m7b5/G

G – B – C♯ – E

3rd inversion: C#m7b5/B

B – C♯ – E – G

Other names for C#m7b5

C♯m7♭5 is also written as C♯m7♭5, C#ø7, C♯ø7, C#ø, C♯ø, C#min7b5, C♯min7♭5, C#-7b5, C♯-7♭5, Dbm7b5, D♭m7♭5, Dbø7, D♭ø7, Dbø, D♭ø, Dbmin7b5, D♭min7♭5, Db-7b5, D♭-7♭5.

Keys that contain C♯m7♭5

D major (C♯m7♭5 is the viiø7 chord)
B minor (C♯m7♭5 is the iiø7 chord)