Thread: MOA definition
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Old December 19, 2011, 07:27 PM   #19
Chuck Dye
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Join Date: June 28, 2002
Location: Oregon-The wet side.
Posts: 880
If you have trig functions on your calculator

tan^-1(group size ÷ range) x 60 = MOA

Your calculator may mark the arctan function “arc” or even arctan.

It is imperative that the units used for group size and range be the same, so if the group is 1.5 inches in diameter, the range must be 3600 inches, not 100 yards. For that 1.5 inch group the calculation is:

tan^-1 (1.5÷3600) x60=1.4 MOA (yah, yah, 1.4324 etc. but sig figs!)
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