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♯

Harmonic character: dissonant

Choose a Root

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♯

Related Chords

Common Progressions