It is much easier to not get caught up in the math of either one. The best way is to get a ballistic app, or print a drop chart, that will figure all of that for you then just dial your turrets accordingly.

The math part of MOA or MILS is often talked about but really shouldn't be. Both are angular measurements, not linear, so to try to add linear math like inches, mm, yards, and meters, is getting off path IMO.

This thread may be helpful.

Taking Advantage of Angular Measurements In Scope Use
Scot E.