Well, I don't know how it works for steps exactly, but my guess would be:
1.8º per step on your motor.
1/16th microstepping would mean
100 / 16 = 6.25%
(1.8º / 100) * 6.25 = 0.1125º per microstep
After this, it all comes down to the diameter ø of your gears, the thread on your leadscrews and the size of the belt-pulleys on your stepper motors.
To be honest, I have no idea how to calculate further haha :)
1.8º per step on your motor.
1/16th microstepping would mean
100 / 16 = 6.25%
(1.8º / 100) * 6.25 = 0.1125º per microstep
After this, it all comes down to the diameter ø of your gears, the thread on your leadscrews and the size of the belt-pulleys on your stepper motors.
To be honest, I have no idea how to calculate further haha :)