Half-Diminished Seventh (Minor 7♭5)
The half-diminished chord (minor seven flat five) combines a diminished triad with a minor seventh. It is the ii chord in minor keys and an essential sound in jazz and classical harmony.
Symbol: ø7, m7♭5
Formula: 1-♭3-♭5-♭7
C Half-Diminished Seventh (Minor 7♭5): C – D♯ – F♯ – A♯
Choose a Root
C Half-Diminished Seventh (Minor 7♭5) G Half-Diminished Seventh (Minor 7♭5) D Half-Diminished Seventh (Minor 7♭5) A Half-Diminished Seventh (Minor 7♭5) E Half-Diminished Seventh (Minor 7♭5) B Half-Diminished Seventh (Minor 7♭5) F♯ Half-Diminished Seventh (Minor 7♭5) F Half-Diminished Seventh (Minor 7♭5) B♭ Half-Diminished Seventh (Minor 7♭5) E♭ Half-Diminished Seventh (Minor 7♭5) A♭ Half-Diminished Seventh (Minor 7♭5) D♭ Half-Diminished Seventh (Minor 7♭5)
Interval Formula
| Degree | Interval | Semitones from Root | Note (C Half-Diminished Seventh (Minor 7♭5)) |
|---|---|---|---|
| 1 | Root (1) | 0 | C |
| ♭3 | Minor 3rd (♭3) | 3 | D♯ |
| ♭5 | Tritone (♭5) | 6 | F♯ |
| ♭7 | Minor 7th (♭7) | 10 | A♯ |