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# Why am I getting 1 MOA = .524" at 100 yds?

Blckhrn
Member Posts:

**5,136**
When I know it is just over an inch?

Pi x 100 (yds) x 36 ("/yd)

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360 (deg) x 60 (min/deg)

Pi x 100 (yds) x 36 ("/yd)

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360 (deg) x 60 (min/deg)

## Comments

1,314✭✭✭✭✭[url][/url]http://riflestocks.tripod.com/moa.html

17,868✭✭✭Former Member U.S. Navy Shooting Team

Former NSSA All American

Navy Distinguished Pistol Shot

MO, CT, VA.

5,1367✭✭55✭✭The formula for the circumference of the circle is 2 X Radius X Pi.

The radius = 100 yards.

2 X 100 yards X 3.14159 (Pi) = 628.318 yards

1 degree = circumference divided by 360

628.318/360 = 1.7453 yards

1 minute = 1 degree divided by 60

1.7453 yards/60 = 0.0291 yards

1 yard = 36 inches

1 minute at 100 yards = .0291 X 36 = 1.0472 inches

55✭✭1,061✭✭✭✭5,453✭✭✭MOA= 1/60th of one degree. Therefore 1/60 = .016667 If you convert that distance out to the distance you shoot you must convert this to a planer triangle. So you must find the Sine for it. If you have a scientific calculator take the sin of .0166667. (If you look at the calculator on your computer go up to view, hit the drop down and select scientific.)

It is .00029 This is a constant no matter how far you shoot.

If you want to measure MOA at the distance you shoot in inches find the number of inches at a given distance. i.e. 100 yds = 3600 inches. So...

.00029 x 3600 = 1.047" @100 yds.= 1 MOA

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