Many Rifle Scopes are adjusted based on MOA. The most common use of Minute of Angle is sighting in a rifle scope.

So as an example:ДўвЂі at 100 yards is equal to 2 MOA. Converting Inches to MOAД¬onverting inches to MOA is just as simple as converting MOA to inches. Understanding this comes in handy for all sorts of things. It even works for distances under 100 yards. The math works with and distance and any MOA measurement. This can be confusing so letвЂ™s give a few examples:Д¤ MOA at 300 yards (4*300)/100 = 12 so 4 MOA is equal to 12вЂі at 300 yardsДЈ MOA at 200 yards (3*200)/100 = 6 so 3 MOA is equal to 6вЂі at 200 yardsДў MOA at 100 Yards (2*100)/100 = 2 so 2 MOA is equal to 2вЂі at 100 yards

To convert Minute of Angle to inches at any distance, all you do is take you distance times your MOA divided by 100, and this will equal inches at your set distance. Knowing that 1 MOA is equal to 1вЂі at 100 yards you can now figure out how many MOA is equal to inches at any distance. So unless you are a long-distance shooter trying to adjust for windage, and bullet drop at 1000 yards or longer the difference between mathematical Minute of Angle and the standard shootersвЂ™ definition of Minute of Angle doesnвЂ™t matter at all. 47вЂі at 1000 yards.ДЄs a result, using 1вЂі per 100 yards for this is perfect for most people as there is not enough difference to matter. The difference between using 1вЂі for every 100 yards and 1.047вЂі for every 100 yards is only. I say roughly because the actual math says itвЂ™s equal to 1.047 inches. Without going into lots of complicated math formulas, 1 MOA is equal to roughly a 1вЂі circle at 100 yards. Lucky for us Minute of Angle fits that measurement. You can see very quickly that you need a measurement that is much smaller than even 1 degree. At 200 yards that same 1-degree measurement would equal 120 inches. The problem with this would be that even a 1-degree angle change from the center of your scope would translate into 60 inches at 100 yards, and it would get worse the farther you go out. LetвЂ™s say you adjusted your rifle scope crosshairs in whole degrees. We canвЂ™t use inches since we have an angular vision, and since rifles shoot in a cone shape trajectory, which means we must use degrees. This is all assuming you followed all the shooting fundamentals and you hit where you were aiming. The problem arises when you try to measure how far off your point of impact is versus your point of aim on your target. ItвЂ™s the same when you are aiming a rifle the farther away you are from your target the smaller it appears. The size of the object doesnвЂ™t change but your visual angle does. However, the farther away from it the more of it you can see. The closer you are to an object the less of it you can see. Of course, the accuracy of the gun greatly affects the size of this circle. No matter what the bullet ballistics of the bullet they will all hit within a circle of impact known as MOA. The farther they go before they hit, the more likely they are to hit the target within a bigger circle. Minute of Angle is used to measure the average point of impact of a bullet on target, as bullets fired from a gun will impact in a cone-shaped trajectory. Statements like that can lead to people asking what is MOA? MOA stands for Minute of Angle and is based on the angular measurement minute of arc or 1/60 of one degree. For those new to shooting you hear the term MOA used a lot.

3 moa vs 6 moa for astigmatism