Suburban has written a program to work out how many clicks are

needed to adjust your scope. It runs on TI-83 calculators.

I wrote this program for use on a TI-83. I’m not sure if it will work as written on newer models. You input the range, the click values for your scope, and how many inches you need to move the impacts, and it spits out the number of clicks. Works good with high quality scopes, but the click values for cheaper scopes don’t always turn out to be exactly what the manufacturer says they are.

More here.