root position: Bdim7
B – D – F – A♭
Bdim7 Piano Chord
The B diminished 7 chord (Bdim7) is made of the notes B, D, F and A♭. Its formula is 1 – ♭3 – ♭5 – 𝄫7.
Notes in Bdim7
| Note | Formula | Interval from root |
|---|---|---|
| B | 1 | root |
| D | ♭3 | minor 3rd |
| F | ♭5 | diminished 5th |
| A♭ | 𝄫7 | diminished 7th |
How to play Bdim7 on piano
- Right hand: fingers 1-2-3-5
- Left hand: fingers 5-3-2-1
Fingers are numbered from the thumb (1) to the little finger (5).
Bdim7 inversions
1st inversion: Bdim7/D
D – F – A♭ – B
2nd inversion: Bdim7/F
F – A♭ – B – D
3rd inversion: Bdim7/Ab
A♭ – B – D – F
Other names for Bdim7
Bdim7 is also written as B°7.
Keys that contain Bdim7
Bdim7 is not one of the basic chords of any major or minor key. It is usually used as a passing or colour chord.