MIL vs MOA! Lets get right into this. When discussing MIL vs MOA we should begin by describing each and how they work, as well as the similarities between them. MILS is the plural form of MIL which is short for Milliradian. A Milliradian is 1/1000th of a Radian. This is a way of measuring a circle. How does that apply to the MILS vs MOA discussion? Well, at 100 yards the size of a MIL is 3.6 inches. Why? Simple, because a Milliradian is always 1/1000th of a Radian. Clear as mud right? Look at it this way, the total distance is your Radian.