Dm7b5 Chord on Guitar
Dm7b5 = D – F – G# – C (Root, Minor 3rd, Tritone, Minor 7th)
Dm7b5 — also called D half-diminished — occupies a specific and important harmonic niche as the standard ii chord in minor-key jazz progressions, the essential first link in a minor ii-V-i cadence. At the tenth fret, its E-shape barre voicing is one of the more physically involved shapes in this cluster, needing an extra reach for the flattened fifth beyond what a plain minor seventh chord requires.
The notes are D, F, G#, and C — root, minor third, diminished fifth, flat seventh — which makes it easy to confuse with a diminished seventh chord on paper, but the two are meaningfully different: a full diminished seventh flattens the seventh twice, while half-diminished flattens it only once, giving m7b5 a smoother, more functional sound suited to ii-V-i minor cadences rather than existing purely as unstable passing color. As ii in a minor key, Dm7b5 leads directly into a dominant chord, often altered, before resolving to the i.
Fingerings
Barre (10th fret)
How to Practice It
The diminished fifth demands a stretch beyond what the plain Dm7 shape asks for, similar to the reach the diminished triad needs but layered onto a fuller four-note chord, so isolating that finger placement before attempting the whole shape at tempo is worthwhile. Because this chord's real identity comes from its function within a ii-V-i progression, practicing it directly alongside the V and i chords it typically precedes builds a far more useful understanding than learning the shape in isolation.
Common Progressions
- Dm7b5 – G7 – Cm (ii7b5 – V7 – i, a textbook minor ii-V-i)
- Dm7b5 – G7b9 – Cm7 (a jazzier version with an altered dominant)
- Dm7b5 – G7 – Cm6 (resolving the minor ii-V into a colored tonic)
- Em7 – Dm7b5 – G7 – Cm (a longer minor-key jazz turnaround)
FAQ
- What's the difference between Dm7b5 and Ddim7?
- Half-diminished flattens the seventh once, giving a flat seventh, while a full diminished seventh flattens it twice, giving an interval enharmonically the same as a major sixth — making dim7 the more symmetrical and unstable of the two.
- Why is Dm7b5 called 'half-diminished'?
- It shares the diminished triad's root, minor third, and flattened fifth, but uses a regular flat seventh rather than continuing the fully diminished stacking pattern.
- What's Dm7b5's most common harmonic role?
- It functions as the ii chord in minor-key ii-V-i progressions, an essential building block of jazz harmony in minor keys.
- Why does this chord need an extra stretch to finger?
- The flattened fifth sits a half step below the perfect fifth a plain Dm7 would use, demanding more precision and reach than the unaltered minor seventh chord asks for.
- Is Dm7b5 common outside jazz?
- Not especially — rock and pop tend to reach for plainer minor-family chords instead, leaving Dm7b5 mostly to singer-songwriter and film-score writing that specifically wants a minor-key ii chord's particular tension.
- Does Dm7b5 ever substitute for a diminished seventh chord?
- Occasionally, since the two share three of their four notes, but they're not fully interchangeable — m7b5's smoother flat seventh gives it a more functional role than the fully diminished chord's.
- Is there a simpler way to approach this shape for a player still building barre confidence?
- Practicing the plain Dm7 shape first and only adding the lowered fifth once that feels secure isolates the one genuinely tricky element of this chord from the more familiar barre technique underneath it.
Dm7b5 on other instruments: Dm7b5 on Piano. Related: how chords are built, chord finder.