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

The chords in the key of B♭ Major

B Flat Major Chord B♭
C minor Chord Cm
D minor Chord Dm
E Flat Major Chord E♭
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°)

      B♭    Cm    Dm    E♭    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)

Key of B♭ Major Using 7th Chords

B Flat Major 7 Chord B♭Maj7
C minor 7 Chord Cm7
D minor 7 Chord Dm7
E Flat Major 7 Chord E♭Maj7
F Dominant 7 Chord F7
G Minor 7 Chord Gm7
A minor 7 ♭5 Chord Am7♭5

B♭ Major 7 - C minor 7 - D minor 7 - E♭ Major 7 - F Dominant 7 - G minor 7 - A minor 7 ♭5

   B♭Maj7  Cm7   Dm7  E♭Maj7  F7   Gm7   Am7♭5   
e|----1-----5-----1-----6-----5----------------|
B|----3-----4-----1-----8-----4-----3-----1----|
G|----2-----3-----2-----7-----5-----3-----0----|
D|----3-----5-----0-----8-----3-----3-----1----|
A|----1-----3-----------6-----------x-----0----|
E|----------------------------------3----------|
      I     ii   iii    IV    V     vi   vii