200 steps per rev for steppers, 10 micro stepping on the Geckos so thats 2000 steps per motor rev, 2 turns to move one inch so that is 4,000 steps per inch for A and X (although maybe you are meaning X and Y ? )
Z axis is same for motor and drive so that is 2000, the ballscrew is 25.4/10=2.54 turns per inch so 2000 x 2.54 = 5080 steps per inch for Z.
Hood
Edit
Looks like I was beat to it LOL