Chord
F♯dim7 is a diminished seventh chord with the notes F♯, A, C, E♭. Also written F♯°7. The same chord spelled from G♭ is G♭dim7.
| Note | Interval | Semitones |
|---|---|---|
| F♯ | root | 0 |
| A | minor 3rd | 3 |
| C | diminished 5th | 6 |
| E♭ | diminished 7th | 9 |
| Root position | F♯ – A – C – E♭ | |
| 1st inversion | A – C – E♭ – F♯ (F♯dim7/A) | |
| 2nd inversion | C – E♭ – F♯ – A (F♯dim7/C) | |
| 3rd inversion | E♭ – F♯ – A – C (F♯dim7/E♭) |
A diminished seventh chord stacks three minor 3rds. It divides the octave into four equal parts, so the same four notes form diminished chords on four different roots; it often replaces a dominant chord.
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