# what is MOA

Discussion in 'General Discussion' started by 222rem, May 10, 2010.

1. ### 222remMember

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Apr 11, 2010
How far is a MOA in mms or inch?

2. ### jimbiresWell-Known Member

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Mar 16, 2008
it is roughly 1" per hundred yards . or 1.047 to be exact . the .047 doesn't mean much at closer distances . this should be more info than you need . LOL here you go .

What is Minute of Angle

3. ### EagletWell-Known Member

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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.

4. ### 222remMember

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Apr 11, 2010
thanks for all the info.