What notes are in the Bdim chord?

Bdim is made of B, D and F: the root, minor 3rd and tritone above B.

What is the easiest way to play Bdim?

Play xx9767 (low E to high E): mute the low E and A strings.

Which keys is Bdim in?

Bdim belongs to C major (vii°).

B Diminished chord on guitar

B diminished (Bdim) is a diminished triad: tense and unstable. It is built from B, D and F (formula 1 ♭3 ♭5). Diminished chords usually pass between two other chords, leading up a half step. The easiest way to play it in standard tuning is xx9767.

x x 9 7 6 7

x x 9 10 12 10

Bdim fingerings (low E to high E)

Fret 6: xx9767. Mute the low E and A strings.
Fret 9: x-x-9-10-12-10. Mute the low E and A strings.

Questions

What notes are in the Bdim chord?: Bdim is made of B, D and F: the root, minor 3rd and tritone above B.
What is the easiest way to play Bdim?: Play xx9767 (low E to high E): mute the low E and A strings.
Which keys is Bdim in?: Bdim belongs to C major (vii°).

Also try: B Major · B Minor · B7 · Bmaj7 · Chord Charts