Learn › C Half Diminished Chord on Guitar (Cm7b5)
New Released in April 2026
C Half Diminished Chord on Guitar (Cm7b5)
The C half diminished chord on guitar (Cm7b5) uses the notes C, Eb, Gb, Bb. It is an open chord: some strings ring without fingers. Strum from the 5th string down. First the picture, then each finger, then three chords to practise Cm7b5 with.
No account, no download. The demo has limited content. Advanced features are in ChordRunner Premium.
- MIDI keyboard
- Digital or acoustic piano
- Guitar
- Computer, phone or tablet
Cm7b5 chord diagram
Fingers and frets
- Index: 5th string (A), fret 3
- Ring: 4th string (D), fret 4
- Middle: 3rd string (G), fret 3
- Little: 2nd string (B), fret 4
Strings to play
x3434x: × = do not play, 0 = open string.
Where Cm7b5 is used
Cm7b5 leads to F7 and then home: it is the ii chord of a minor key, as in Cm7b5 → F7 → Bbm.
Cm7b5 string by string
| 5th string (A) | fret 3: C |
|---|---|
| 4th string (D) | fret 4: Gb |
| 3rd string (G) | fret 3: Bb |
| 2nd string (B) | fret 4: Eb |
From Cdim to Cm7b5: 3rd string (G): fret 5 → fret 3.
Slide this shape along the neck: fret 1 = Bbm7b5, fret 2 = Bm7b5, fret 4 = C#m7b5, fret 5 = Dm7b5.
Another way to play Cm7b5
This shape has the same notes higher up the neck. Use it when the chord before or after sits nearby.
Play Cm7b5 in a game
Strum Cm7b5 near the microphone when it comes up in ChordRunner: the game checks all four notes, C, Eb, Gb, Bb, and moves on. MIDI keyboard or microphone, both work. MIDI keyboard or microphone, both work.
Play the demoCommon questions
Is Cm7b5 easy on guitar?
Yes, it is one of the open chords beginners learn first. Start slowly, check that every string rings, then practise switching to Cdim.
What is the difference between Cm7b5 and Cdim on guitar?
Cm7b5 adds one note to Cdim: Bb, on top of C Eb Gb. From Cdim to Cm7b5: 3rd string (G): fret 5 → fret 3.
Which fingers do I use for Cm7b5?
Index finger: 5th string (A), fret 3, ring finger: 4th string (D), fret 4, middle finger: 3rd string (G), fret 3, little finger: 2nd string (B), fret 4.
Does ChordRunner hear Cm7b5 on guitar?
Yes. Strum it near the phone or computer microphone and the game checks the four notes C, Eb, Gb, Bb. A USB MIDI keyboard works too.
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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