Stepper belt drive angle calculations pullys

Other Hardware Motors, Mechanics, Power and CNC
1

I have a NEMA 17 stepper with a 20T pully driving a 1120T custom pully. The stepper operates 1.8 degrees per step 200 steps for full revolution. The pully ratio is 1120:20=56.
I'll use the stepper to drive the big pully to a specific angular position - for example move 20 degrees from current position.
How do I determine how many steps to move the stepper to achieve the angular move of the big pully?
I believe this will work but I'm not sure this is a good approach:
1.8 degrees/56= 0.03214 degrees (per step) big pully.

This would seem to work since 0.03214..*200 (steps)*56= 360 degrees (full rotation of big pully)

So for the example above of moving big pully ~20 degrees, I'd need to move the stepper 622 steps (20/0.03214..~622).

Is there a better approach?
Thank you,Gil

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You have the right idea, and that is the only approach.

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