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

The chords in the key of A flat (A♭) Major

A flat Major Chord Ab
B flat minor Chord B♭m
C minor Chord Cm
D flat Major Chord D♭
E flat Major Chord E♭
F minor Chord Fm
G diminished Chord Gdim

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

      Ab    Bbm   Cm    Db    Eb    Fm    Gdim  
      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)