Entering ratios when using Gear Racks instead of Lead Screws

I know I've seen this formula here before. Could someone please point me to it?

I need to enter data into stepconf and pncconf for getting the proper steps for travel.

One machine is using gear racks instead of the usual lead screw arrangement and the other is using timing belts.

What is the formula for translating these for pncconf and stepconf?

Thanks in advance!

I usually have better luck just calculating the number of steps/inch (or mm) on my own and putting it in the ini file after i'm done.
But I spent a great deal of time once working backwards to get the result I wanted in Stepconfig for a rack and pinion setup.
I had a step motor with 200steps, runing 2x microstepping, 1:8 belt reduction from motor:pinoin, and a 1" pitch diameter pinion. The numbers I needed to enter were pretty much just those, except leadscrew pitch = 1/pinion pitch diameter*pi.

Basically the value you enter in Leadscrew Pitch needs to equal the number of turns (or fractions of a turn) of the screw, pinion, sprocket... are need to move the machine one machine unit.