What Is MOA on a Rifle Scope? Measurements, Clicks, Turrets and How to Read It
MOA is one of the fundamental concepts for understanding how a rifle scope works. You will find it mentioned on adjustment turrets, in some reticles, when discussing rifle accuracy and even when describing the size of a red dot.
However, seeing MOA used in all of these situations does not mean that it is describing exactly the same characteristic.
A 1/4 MOA turret adjustment, a 1 MOA group and a 2 MOA red dot all use the same angular unit, but they describe three different things.
In this guide we explain what MOA really is, how much 1 MOA represents at different distances, how turret clicks should be interpreted, how MOA relates to MIL/MRAD and FFP/SFP, and why understanding this angular system helps you make better use of a hunting rifle scope.
What does MOA mean?
MOA stands for Minute of Angle.
It is an angular unit of measurement:
- a complete circle contains 360 degrees;
- each degree is divided into 60 minutes of angle;
- therefore, 1 MOA equals 1/60 of one degree.
The key point is that MOA measures an angle, not a fixed number of centimetres or inches.
The linear distance represented by that angle becomes larger as the distance to the target increases.
That is why 1 MOA represents approximately 2.91 cm at 100 metres and approximately 5.82 cm at 200 metres.
How big is 1 MOA at 100 metres?
At 100 yards, 1 MOA corresponds to approximately 1.047 inches.
Using the metric system:
1 MOA at 100 metres ≈ 2.91 cm.
For quick mental calculations this is often rounded to 3 cm, which is perfectly useful in practical conversation. When explaining the system accurately, however, approximately 2.91 cm is the better reference.
1 MOA at different distances
| Distance | Approx. 1 MOA | Practical rounded value |
|---|---|---|
| 25 m | 0.73 cm | 0.75 cm |
| 50 m | 1.45 cm | 1.5 cm |
| 100 m | 2.91 cm | 3 cm |
| 200 m | 5.82 cm | 6 cm |
| 300 m | 8.73 cm | 9 cm |
| 400 m | 11.64 cm | 12 cm |
| 500 m | 14.54 cm | 15 cm |
The relationship is proportional: if the distance doubles, the linear distance covered by the same angle approximately doubles as well.
Why does MOA remain the same when distance changes?
This is one of the most important ideas to understand.
One MOA is always one MOA.
What changes with distance is the physical size that the angle covers on the target.
You can imagine the angle as a cone that becomes wider as distance increases:
- at 50 metres, 1 MOA covers approximately 1.45 cm;
- at 100 metres, approximately 2.91 cm;
- at 200 metres, approximately 5.82 cm;
- at 500 metres, approximately 14.54 cm.
This is why angular measurements are so useful in rifle optics: the same angular language can be used at different distances.
What does 1/4 MOA per click mean?
When a turret is marked 1/4 MOA per click, each click changes the angular adjustment of the scope by one quarter of one MOA.
- 4 clicks of 1/4 MOA = 1 MOA.
- 8 clicks of 1/8 MOA = 1 MOA.
- 2 clicks of 1/2 MOA = 1 MOA.
It should not be assumed that every rifle scope uses 1/4 MOA clicks. Some scopes use 1/8 MOA, 1/2 MOA or other values, while many modern precision scopes use MRAD instead.
The markings on the turret and the manufacturer's technical specifications are always the correct reference.
How much does one 1/4 MOA click move the point of impact?
| Distance | 1 MOA | 1 click of 1/4 MOA |
|---|---|---|
| 50 m | 1.45 cm | ≈ 0.36 cm |
| 100 m | 2.91 cm | ≈ 0.73 cm |
| 200 m | 5.82 cm | ≈ 1.45 cm |
| 300 m | 8.73 cm | ≈ 2.18 cm |
| 400 m | 11.64 cm | ≈ 2.91 cm |
| 500 m | 14.54 cm | ≈ 3.64 cm |
This table explains why the same angular click represents a larger linear movement as the distance increases.
What about a 1/8 MOA click?
A 1/8 MOA turret divides one MOA into eight adjustment increments.
| Distance | 1 click of 1/8 MOA |
|---|---|
| 50 m | ≈ 0.18 cm |
| 100 m | ≈ 0.36 cm |
| 200 m | ≈ 0.73 cm |
| 300 m | ≈ 1.09 cm |
| 500 m | ≈ 1.82 cm |
A smaller angular click allows finer adjustments, but it does not automatically make the rifle scope, rifle or complete shooting system more accurate.
Actual precision depends on the complete system: mechanical quality, turret tracking, mounting, ammunition, rifle, environmental conditions and shooter consistency.
MOA on the turrets and MOA in the reticle are not the same specification
They use the same angular unit but describe different functions.
MOA turret adjustments
MOA on the turret describes how much each click changes the angular elevation or windage adjustment.
MOA reticle
MOA in the reticle describes the angular value between specific reference marks.
Those references can be used to interpret deviations and holds directly through the reticle rather than relying exclusively on the turrets.
When both reticle and turrets use the same angular system, for example MOA/MOA, the relationship is particularly intuitive because observation and correction use the same angular language.
MOA and First or Second Focal Plane: how are they related?
MOA and focal plane describe different characteristics.
A rifle scope can have:
- an FFP MOA reticle;
- an FFP MRAD reticle;
- an SFP MOA reticle;
- an SFP MRAD reticle;
- or a hunting reticle without a complete angular scale.
The focal plane becomes particularly important when the markings within the reticle are being used.
With an MOA reticle in the First Focal Plane (FFP), its subtensions retain their angular value as magnification changes.
With an MOA reticle in the Second Focal Plane (SFP), those subtensions correspond to their specified angular values at the magnification for which the manufacturer has calibrated the reticle.
This does not change the value of the turret clicks. A turret that adjusts 1/4 MOA per click continues to adjust 1/4 MOA regardless of whether the reticle is FFP or SFP.
For a full explanation, read our guide to First Focal Plane vs Second Focal Plane rifle scopes.
MOA and MRAD/MIL: two different angular systems
MOA and MRAD are two different ways of expressing angles.
| System | At 100 m | Common turret increment |
|---|---|---|
| 1 MOA | ≈ 2.91 cm | 1/4 MOA per click |
| 1 MRAD / 1 mil | 10 cm | 0.1 MRAD per click |
As an approximate mathematical relationship:
- 1 mil ≈ 3.438 MOA;
- 1 MOA ≈ 0.291 mil.
Neither system is inherently more precise.
What matters is understanding the system being used and, whenever possible, maintaining a clear relationship between reticle and turret units.
You can continue into the MIL side of the system through our guide to the Mil-Dot reticle and milliradians or compare rifle scopes with Mil-Dot reticles.
MOA vs MIL/MRAD: quick comparison
| Feature | MOA | MIL / MRAD |
|---|---|---|
| Type of measurement | Angular | Angular |
| Value at 100 m | ≈ 2.91 cm | 10 cm |
| Common turret increment | 1/4 MOA | 0.1 mil |
| Typical click at 100 m | ≈ 0.73 cm with 1/4 MOA | 1 cm with 0.1 mil |
| Reticles available | Yes | Yes |
| Compatible with FFP and SFP | Yes | Yes |
What does a 1 MOA group mean?
MOA is also used to describe the angular size of a shot group.
In simplified terms, a group measuring approximately 2.91 cm at 100 metres represents about 1 MOA.
At 200 metres, a group of approximately 5.82 cm represents the same angular size: about 1 MOA.
This makes it possible to compare group sizes shot at different distances using the same angular reference.
| Approximate group size | At 100 m | At 200 m | At 300 m |
|---|---|---|---|
| 0.5 MOA | 1.45 cm | 2.91 cm | 4.36 cm |
| 1 MOA | 2.91 cm | 5.82 cm | 8.73 cm |
| 2 MOA | 5.82 cm | 11.64 cm | 17.45 cm |
When measuring a group accurately, the useful measurement normally concerns the spread between the centres of the furthest impacts rather than simply the outside-to-outside width of the bullet holes.
What does 2 MOA mean on a red dot sight?
This is one of the most common sources of confusion.
When a red dot sight is described as having a 2 MOA dot, this usually does not describe how much its adjustment turrets move per click.
It describes the angular size of the visible red dot.
A 2 MOA dot covers approximately:
| Distance | Approximate diameter of a 2 MOA dot |
|---|---|
| 25 m | 1.45 cm |
| 50 m | 2.91 cm |
| 100 m | 5.82 cm |
| 200 m | 11.64 cm |
An Aimpoint described as having a 2 MOA dot therefore does not mean that its turrets necessarily adjust by 2 MOA per click. The 2 MOA specification describes the angular diameter of the aiming dot.
What does a 4 MOA red dot mean?
The same principle applies to a 4 MOA dot.
| Distance | Approximate diameter of a 4 MOA dot |
|---|---|
| 25 m | 2.91 cm |
| 50 m | 5.82 cm |
| 100 m | 11.64 cm |
| 200 m | 23.27 cm |
A smaller dot covers a smaller part of the target at a given distance, while a larger dot may be quicker to acquire visually in some applications.
The choice between 2 MOA, 4 MOA and other dot sizes should therefore be based on the intended use rather than assuming that a smaller or larger figure is automatically better.
Compare the different options in our range of red dot sights.
MOA and rangefinders: why distance matters
MOA is an angular measurement, but to translate an angular correction into a physical distance on the target we need to know the range.
This is why a laser rangefinder can form part of the same optical system when distance is an important variable.
An incorrectly estimated range can mean that an angular correction that is mathematically correct does not correspond to the actual shooting situation.
For stalking and long-range applications, the system should therefore be considered as a whole:
range + ballistics + rifle scope + turrets + reticle + conditions + shooter.
MOA for stalking
In stalking, understanding the adjustment system of the scope can be particularly useful because shooting distances may vary considerably.
However, MOA is only one part of the complete optical system.
You should also consider:
- optical quality;
- reticle design;
- FFP or SFP;
- ballistic turret system;
- parallax adjustment;
- mechanical repeatability;
- scope mounting;
- accurate range measurement.
If you are building the complete setup for this type of hunting, explore our complete equipment for stalking and our selection for stalking and long-range hunting.
MOA for long range and precision shooting
As distance increases, a consistent angular language becomes increasingly useful.
Corrections are no longer best thought of simply as centimetres on a distant target. They are managed as part of a coherent angular system.
A rifle scope can work extremely well in MOA provided the shooter understands:
- the value of each click;
- the reticle system;
- the relationship between reticle and turrets;
- the total elevation adjustment range;
- parallax adjustment;
- the magnification being used;
- the mechanical tracking of the scope.
For these applications, explore our PRS and precision shooting scopes and our long-range optics and equipment.
MOA and parallax: different concepts that both matter
MOA and parallax are not the same thing.
MOA is an angular unit used to describe adjustments, subtensions, group sizes and other angular specifications.
Parallax is an optical phenomenon involving apparent reticle movement against the target when eye position changes.
A scope can use perfectly accurate MOA graduations and still be used incorrectly if parallax error is not properly controlled for the shooting situation.
The two concepts therefore belong within the same technical knowledge hub, while describing very different characteristics.
Learn more in our complete guide to rifle scope parallax and how to adjust it.
MOA and rifle scope mounts
A high-quality optical system also requires a mechanically stable connection between the rifle and the scope.
Understanding exactly what each MOA click means is of limited value if the bases, rings or mount cannot maintain the scope in a consistent position.
The complete system should therefore be considered together:
rifle + base + rings or mount + rifle scope + reticle + adjustments + ammunition + shooter.
For a deeper understanding, read our Definitive Guide to Hunting Scope Mounts and Rings or explore our range of rifle scope mounts, rings and bases.
What does 20 MOA mean on a scope base or mount?
MOA can also appear in the specification of scope bases and mounting systems.
A base or rail described as 20 MOA incorporates an angular inclination into the mounting system.
Here, once again, MOA is describing an angle.
An inclined base changes the starting relationship between the rifle scope and the bore axis and can allow more of the scope's internal elevation adjustment to be available in one direction.
This does not mean that a 20 MOA base is automatically the right choice for every rifle.
Its suitability depends on the scope's internal adjustment range, the rifle, the mounting system and the intended application.
Common mistakes when understanding MOA
- Thinking MOA is a fixed measurement in centimetres. It is an angular measurement and its linear equivalent changes with distance.
- Saying that 1 MOA is exactly 3 cm at 100 m. That is a useful practical approximation; the more accurate figure is approximately 2.91 cm.
- Confusing a 2 MOA red dot with a 2 MOA turret adjustment. They are different specifications.
- Assuming every rifle scope adjusts in 1/4 MOA clicks. Click value depends on the individual model.
- Thinking 1/8 MOA clicks automatically make a scope more accurate. They simply provide a smaller angular adjustment increment.
- Confusing MOA with FFP or SFP. They describe different optical characteristics.
- Mixing a MIL reticle with MOA calculations without understanding the conversion.
- Ignoring the units used by the turrets. Many modern rifle scopes use MRAD instead of MOA.
- Confusing group accuracy with turret click resolution.
- Assessing the rifle scope separately from the mounting system and the rest of the setup.
MOA terminology at a glance
| When you read... | It means... |
|---|---|
| 1 MOA | An angle of 1/60 of one degree |
| 1 MOA at 100 m | ≈ 2.91 cm |
| 1/4 MOA per click | Four clicks equal 1 MOA |
| 1/8 MOA per click | Eight clicks equal 1 MOA |
| MOA reticle | Reticle references are defined using MOA angular values |
| 1 MOA group | An approximate angular dispersion of 1 MOA |
| 2 MOA red dot | The aiming dot has an angular diameter of approximately 2 MOA |
| 20 MOA base | The mounting system incorporates approximately 20 MOA of angular inclination |
| 1 mil | ≈ 3.438 MOA |
What should you check in a rifle scope specification?
| Specification | What it tells you |
|---|---|
| Adjustment per click | The angular value of each turret click |
| MOA or MRAD | The angular system being used |
| Elevation adjustment range | The total angular adjustment available in elevation |
| Windage adjustment range | The total angular adjustment available in windage |
| Reticle | The design and reference system used in the sight picture |
| FFP / SFP | The focal plane in which the reticle is positioned |
| Parallax adjustment | Whether and how parallax can be corrected |
Is MOA better than MRAD?
There is no universal answer.
Both are valid angular systems.
The best choice depends on the shooting discipline, personal familiarity, the reticle, turret system and the wider ballistic ecosystem being used.
More important than choosing MOA or MRAD is avoiding an unnecessarily complicated combination.
If you use a mil-based reticle, mil-based turrets usually provide a particularly straightforward relationship. The same principle applies to an MOA reticle combined with MOA turrets.
The best system is the one the shooter understands and can interpret consistently.
MOA within the complete rifle scope system
Understanding MOA is important, but a single specification should never become the only criterion used to choose an optic.
A good rifle scope should be evaluated as a complete system:
- optical quality;
- magnification range;
- field of view;
- reticle;
- FFP or SFP;
- turrets;
- MOA or MRAD;
- parallax adjustment;
- eye relief;
- weight and dimensions;
- mechanical quality;
- mounting system;
- intended hunting or shooting discipline.
If you are comparing scopes rather than a single specification, start with our complete selection of hunting rifle scopes.
Checklist: do you really understand your rifle scope?
- Do the turrets work in MOA or MRAD?
- What angular value does each click represent?
- Does the reticle use the same angular system as the turrets?
- Is the reticle in the First or Second Focal Plane?
- If it is SFP, at what magnification are its subtensions calibrated?
- Does the rifle scope have parallax adjustment?
- Do you know the total elevation and windage adjustment range?
- Do you understand which parts of the system influence overall precision?
Conclusion: MOA is an angular language, not simply centimetres at 100 metres
The most important idea is simple:
MOA is an angular unit.
One MOA equals 1/60 of one degree and represents approximately 2.91 cm at 100 metres. As distance increases, the linear size represented by that same angle increases proportionally while the angle itself remains unchanged.
Once this principle is understood, it becomes much easier to interpret:
- turret clicks;
- MOA reticles;
- groups expressed in MOA;
- the difference between MOA and MRAD;
- reticle subtensions;
- red dot sizes expressed in MOA;
- MOA values used on inclined scope bases.
Most importantly, it prevents individual specifications from being interpreted in isolation.
Precision and practical performance come from the complete system:
rifle + ammunition + mount + rifle scope + reticle + turrets + range + conditions + hunter or shooter.
Continue building that knowledge through our complete range of hunting rifle scopes, our guide to FFP vs SFP, our explanation of rifle scope parallax, our guide to the Mil-Dot reticle and MIL/MRAD system, our PRS rifle scopes and our scope mounts and rings.
