Swampfox Optics logo
Swampfox Optics logo

All articles

What is MOA?Updated 2 years ago

MOA (Minute of Angle) is an angular measurement used to change the impact of the bullet at different distances. Before you can change the impact of the bullet, the shooter needs to know the distance of the target. MOA that is 1/60th of a degree. There are 360 degrees in a circle, and 60 minutes of arc in each degree totaling to 21600 minutes of angle in a complete circle. To understand this, picture the shooter in the center of a circle and the target is at the edge of the circle. The distance between the shooter and the target is the radius (R). For any giving distance, range, or radius between the shooter and the target is equal to one minute. One minute is equal to 2πR÷21600.

If the range is 100 yards, that distance is equal to 3,600 inches. When we plug 3,600 in for R in our formula, the result is (2)(3.1416)(3,600)÷21,600 = 1.0472 inches. Therefore, at 100 yards, one MOA is equal to 1.0472 inches. The formula works for any range. If the range is 500 yards, one MOA equals 5.2360 inches.

1 MOA is a different size at different distances, 8″ at 800 yards is still just 1 MOA.

Was this article helpful?