What is MOA?Minute of Angle in Shooting
MOA (Minute of Angle) is the universal language of accuracy in shooting. Whether you are zeroing a scope, testing ammunition, or tracking your progress over time, MOA gives you a single number that means the same thing at every distance. This guide explains what MOA is, how it works, and why it matters.
The Definition
One degree of arc is divided into 60 minutes. Each minute is one MOA — that is 1/60th of a degree. In practical terms, at 100 meters this angle subtends approximately 2.91 cm (or about 1.047 inches at 100 yards).
Because MOA is an angle, not a fixed length, the size it covers on a target grows proportionally with distance. At 50 m it is 1.45 cm, at 200 m it is 5.82 cm. The angle stays the same — the spread on the target changes. This proportional behavior is exactly what makes MOA so useful: it describes the precision of the shooter and firearm, independent of how far away the target is.
Why Shooters Use MOA
Universal comparison
"I shot a 2 MOA group" means the same thing whether you were at 25 meters or 300 meters. It lets you compare sessions across distances without mental gymnastics.
Scope adjustments
Rifle scopes and red dots use MOA (or MRAD) clicks for windage and elevation. Understanding MOA lets you make precise corrections — one click of a 1/4 MOA turret moves your point of impact by 0.73 cm at 100 m.
Tracking progress
Your group size in centimeters is only half the picture. MOA normalizes for distance, so you can genuinely track whether your shooting is improving over weeks and months.
Ammunition testing
Ammo reviews and manufacturer specs list accuracy in MOA. Knowing what 1 MOA or sub-MOA means helps you pick the right loads for your purpose.
Effective communication
MOA is the shared vocabulary of the shooting community worldwide. When someone at the range says their rifle is a "1.5 MOA gun," every shooter understands what that means.
MOA vs MRAD
You will encounter two angular measurement systems in shooting: MOA and MRAD (milliradian, sometimes called "mil"). Both do the same job — they describe angles — but they divide the circle differently.
| MOA | MRAD | |
|---|---|---|
| Size at 100 m | 2.91 cm | 10 cm |
| Typical click | 1/4 MOA (0.73 cm) | 0.1 MRAD (1 cm) |
| System | Sexagesimal (degrees) | Metric (radians) |
| Popular in | USA, hunting, sport | Military, Europe |
Neither system is inherently better. MOA gives you finer granularity per click, which some shooters prefer for precise zeroing. MRAD uses clean decimal math, which can be faster for range estimation and holdovers. The most important thing is to match your reticle to your turrets — do not mix a MOA reticle with MRAD turrets.
1 MOA at Different Distances
Since MOA is an angle, its linear size on the target grows with distance. Here is what 1 MOA equals in centimeters and inches at common shooting distances:
| Distance | 1 MOA (cm) | 1 MOA (inches) |
|---|---|---|
| 25 m | 0.73 cm | 0.29" |
| 50 m | 1.45 cm | 0.57" |
| 100 m | 2.91 cm | 1.15" |
| 200 m | 5.82 cm | 2.29" |
| 300 m | 8.73 cm | 3.44" |
Values are approximate. Exact: 1 MOA at 100 m = 2.908 cm. The simplified formula (distance in m × 0.0291) is accurate to within 0.3%.
How MOA Relates to Accuracy
When shooters talk about accuracy, they almost always express it in MOA. Here is a rough guide to what different MOA values mean in practice:
Sub-MOA (below 1 MOA)
Excellent accuracy. Typical of precision rifles with match-grade ammunition. At 100 m, your shots land within a 2.9 cm circle.
1-2 MOA
Very good. Most quality factory rifles achieve this with decent ammo. Adequate for hunting and general target shooting at medium distances.
2-4 MOA
Average. Common for pistols at 25 m, or rifles with bulk ammunition. Good enough for many practical applications.
4+ MOA
The firearm or shooter has room for improvement. Could indicate a technique issue, poor ammo match, or a worn barrel.
Keep in mind that MOA describes the system — shooter, firearm, ammunition, and conditions combined. A 1 MOA rifle might shoot 3 MOA groups if the ammunition is inconsistent or the shooter is having an off day. That is why tracking your MOA over multiple sessions is far more valuable than looking at a single group.
Practical Examples
Zeroing a scope
You fire three rounds at 100 m and your group lands 6 cm to the right and 3 cm low. With a 1/4 MOA scope, each click moves your point of impact about 0.73 cm at 100 m. To move 6 cm left, you need 6 / 0.73 ≈ 8 clicks left. To move 3 cm up, you need 3 / 0.73 ≈ 4 clicks up. Fire another group to confirm.
Comparing two range sessions
Last week you shot a 4 cm group at 50 m. Today you shot a 7 cm group at 100 m. Which was better? In MOA: last week was (4 / 50) × 100 = 8.0 MOA. Today was (7 / 100) × 100 = 7.0 MOA. Despite the larger group on paper, today's session was more accurate.
Choosing ammunition
You test two types of 9mm at 25 m. Brand A produces a 2.5 cm group (= 10.0 MOA). Brand B produces a 1.8 cm group (= 7.2 MOA). Brand B is meaningfully more precise in your pistol — worth the extra cost if accuracy matters to you.
Frequently Asked Questions
What does MOA stand for in shooting?
MOA stands for Minute of Angle. It is an angular measurement equal to 1/60th of a degree, used by shooters to describe accuracy, adjust scopes, and compare group sizes across different distances.
How big is 1 MOA at 100 meters?
At 100 meters, 1 MOA equals approximately 2.91 cm (or about 1.047 inches at 100 yards). The value scales linearly — at 50 meters it is 1.45 cm, at 200 meters it is 5.82 cm.
What is the difference between MOA and MRAD?
MOA (Minute of Angle) and MRAD (milliradian) are both angular units used in shooting. 1 MOA equals about 2.91 cm at 100 m, while 1 MRAD equals 10 cm at 100 m. MOA offers finer adjustments (typically 1/4 MOA clicks), while MRAD uses a decimal-friendly system (0.1 MRAD clicks). Neither is objectively better — it depends on preference and equipment.
Is a lower MOA better?
Yes. A lower MOA value means a tighter group of shots, which indicates better accuracy. A rifle that consistently shoots 1 MOA groups is considered very accurate, while 3-4 MOA is typical for many factory firearms.
How do I calculate MOA from my group size?
Use the formula: MOA = (group size in cm / distance in meters) × 100. For example, a 3 cm group at 100 meters equals 3.0 MOA. You can also use a MOA calculator for quick results.
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