Guitar Chords in the Key of B Flat (B♭) Major

The chords in the key of B♭ Major

B Flat Major Chord Bb
C minor Chord Cm
D minor Chord Dm
E Flat Major Chord Eb
F Major Chord F
G Minor Chord Gm
A Diminished Chord Adim

B♭ Major - C minor - D minor - E♭ Major - F Major - G minor - A diminished (A°).

      Bb    Cm    Dm    Eb    F     Gm    Adim  
e|----1-----------1-----6-----1-----3----------|
B|----3-----1-----3-----8-----1-----3-----1----|
G|----3-----0-----2-----8-----2-----0-----2----|
D|----3-----1-----0-----8-----3-----0-----1----|
A|----1-----3-----------6-----------1-----0----|
E|----------------------------------3----------|
      I     ii    iii   IV    V     vi    vii   
		

The chord formula for any Major key is
Major - minor - minor - Major - Major - minor - diminished

A common way to number these chords is by Roman numerals
I - ii - iii - IV - V - vi - vii

(Major chords are usually capitalized, minor and diminished chords are lower case)