root position: Am7b5
A – C – E♭ – G
The A half-diminished 7 chord (Am7♭5) is made of the notes A, C, E♭ and G. Its formula is 1 – ♭3 – ♭5 – ♭7.
| Note | Formula | Interval from root |
|---|---|---|
| A | 1 | root |
| C | ♭3 | minor 3rd |
| E♭ | ♭5 | diminished 5th |
| G | ♭7 | minor 7th |
Fingers are numbered from the thumb (1) to the little finger (5).
A – C – E♭ – G
C – E♭ – G – A
E♭ – G – A – C
G – A – C – E♭
Am7♭5 is also written as Am7♭5, Aø7, Aø, Amin7b5, Amin7♭5, A-7b5, A-7♭5.