Quote:
Originally Posted by 222rem
How far is a MOA in mms or inch?

A MOA is an angular measurement. A MOA stands for "Minute of Angle". A circle has 360 degrees and one degree has 60 minutes so 360 X 60 = 21600 Minutes.
Imagine a Circle that has a one inch radius, very small circle, still would have
21600 minutes all the way around. So...
In our circle, R = 1"
Now, the perimeter of that circle, has a dimension, that would be like a string going around the circle and then you measure it... but will do it with numbers.
Perimeter = 2 X PI X R
PI = 3.14159265
R = 1"
Perimeter = 2 x 3.14159265 x 1" = 6.2831853"
6.28319" would be the length of a string going around a circle of R = 1".
Now let's take that distance and divide it by the number of minutes in the circle just to see what would be the distance that corresponds to 1 minute or one MOA.
6.2831853 / 21600 = .000290888"
That means that 1 MOA (that little angle)
in 1" has a cord length of 0.000290888"
Now, there are 3600 inches in 100 yards ********
3600" x 0.000290888" = 1.047... inches.
What is it? The angular dimension of 1 MOA produces a distance of 1.047 inches at 100 yards.
Many folks would say it's close enough to 1 inch and so they say that one MOA is 1 inch at 100 yards. That in many applications is alright but you need to be careful because in other situations it'll bite back at you.
So 1 MOA angle subtends 10.47" at 1000 yards.
Goes without saying that:
1 MOA = 1.047" AT 100 YARDS
1 MOA = 2.094" AT 200 YARDS
1 MOA = 3.141" AT 300 YARDS
1 MOA = 4.188" AT 400 YARDS ETC.