Guitar Chords in the Key of A Major

The chords in the key of A Major

A Major Chord

A

B flat minor Chord

Bm

C Sharp minor Chord

C♯m

D Major Chord

D

E Major Chord

E

F Sharp minor Chord

F♯m

G Sharp diminished Chord

G♯dim

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

      A     Bm    C#m   D     E     F#m   G#dim 
e|----0-----2-----4-----2-----0-----2----------|
B|----2-----3-----5-----3-----0-----2----------|
G|----2-----4-----6-----2-----1-----2-----4----|
D|----2-----4-----6-----0-----2-----4-----6----|
A|----0-----2-----4-----------2-----4-----5----|
E|----------------------------0-----2-----4----|
      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)