EOTech Reticle Break Down

EOTech EXPS3 / XPS2 reticle break down
Here is a picture to give some details on EOTech EXPS3 / XPS2 Adjustment clicks are 0.5 MOA or 1/2 inch at 100 yards 0.5 MOA @ 50 yards =1/4 inch ......

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Adjustment clicks are 0.5 MOA or 1/2 inch at 100 yards
0.5 MOA @ 50 yards =1/4 inch

An average sized man standing 5'8" will fill the 65 MOA outer reticle at 100 yards. Same man will fill half the reticle at 200 yards, and 1/3 of the reticle at 300 yards. 

Having an understanding of your optic and its relationship to a known size will help you with range estimation. 

Take a little refresher using google-fu look up mil-dot math or check out a sight I have found invaluable :http://www.mil-dot.com/