A Diminished 7th Guitar Chord

also known as Adim7, A°7

  • your first finger goes on the first fret of the fourth string
  • your second finger goes on the first fret of the second string
  • your third finger goes on the second fret of the third string
  • your fourth finger goes on the second fret of the first string
  • the fifth string is open
  • the sixth string is muted
Diagram of an A diminished 7th guitar chord at the open position

Notes in an A Diminished 7th Guitar chord

Root : A

Minor 3rd : C

Tritone : D#

6th : F#