An mrad (milliradian) is an angular measurement that translates neatly into real-world distances: 1 mrad equals exactly 1 centimeter at 100 meters, or about 3.6 inches at 100 yards. This clean, scalable relationship is what makes mrad scopes intuitive once you understand the basics. Whether you’re dialing turret adjustments, ranging a target, or holding for wind, everything builds from that single ratio.
What 1 Mrad Actually Means
A milliradian is 1/1,000th of a radian, a unit of angle. A full circle contains approximately 6,283 milliradians. But you don’t need to think about circles. The practical takeaway is that mrad measurements scale linearly with distance. At 100 meters, 1 mrad spans 10 cm. At 200 meters, it spans 20 cm. At 500 meters, 50 cm. Double the distance, double the size of 1 mrad on the target. This proportional scaling is the entire reason mrad works so well for shooting.
If you work in yards, 1 mrad covers about 3.6 inches at 100 yards. At 300 yards, that becomes 10.8 inches. The math stays simple: multiply the mrad value by the range (in hundreds), and you get the measurement on target.
One note on terminology: “mrad” and “mil” mean the same thing on a rifle scope. These are true milliradians. NATO artillery uses a slightly different “mil” (6,400 per circle instead of the true 6,283), but that distinction only matters for military land navigation and artillery. Every modern rifle scope labeled mrad or mil uses the true milliradian.
How Mrad Turret Clicks Work
Most mrad scopes adjust in 0.1 mrad clicks. Each click moves your point of impact 1 cm at 100 meters. That means 10 clicks equals 1 full mrad, which shifts your bullet strike 10 cm (about 4 inches) at 100 meters. At 200 meters, each 0.1 mrad click moves impact 2 cm. At 500 meters, each click moves it 5 cm.
To use your turrets, you need to know how far off your shot landed. If you’re shooting at 300 meters and your bullet hits 15 cm low, that’s 0.5 mrad low (15 cm divided by 3, since each 0.1 click is worth 3 cm at 300 meters). Dial up 5 clicks and shoot again. The same logic applies to windage: if your shot lands 9 cm to the right at 300 meters, dial 3 clicks left.
This is where mrad has an advantage over MOA for quick mental math. Because the numbers scale in clean metric units (1 cm per 100 m), you can calculate corrections in your head without reaching for a calculator.
Ranging a Target With Your Reticle
Your mrad reticle can estimate how far away a target is, as long as you know the target’s actual size. The formula is straightforward:
Distance (meters) = target size (meters) ÷ target size (mrad as measured in your reticle)
Say you’re looking at a steel plate you know is 45 cm tall (0.45 meters). Through your scope, the plate spans 1.5 mrad on the reticle hash marks. Divide 0.45 by 1.5, then multiply by 1,000, and you get 300 meters.
If you work in yards and inches, the formula adjusts slightly: multiply the target’s height in inches by 27.77, then divide by the mrad reading. A target that measures 18 inches tall and spans 2 mrad in your reticle sits at roughly 250 yards (18 × 27.77 ÷ 2 = 250).
For this to work, you need reliable reference sizes. A standard competition silhouette torso is about 19.5 inches wide. A human head is roughly 10 by 7 inches. A vehicle tire is typically 24 to 26 inches in diameter. Memorizing a few common dimensions lets you range targets quickly in the field without a laser rangefinder.
Holdovers for Bullet Drop
Instead of dialing your turrets for every shot, you can use the hash marks on your mrad reticle to aim above or below the crosshair. This is called “holding over” (or under), and it’s faster than adjusting turrets when targets appear at varying distances.
To use holdovers, you need a drop chart matched to your specific rifle and ammunition. Ballistic calculators or chronograph data will tell you how many mrad of drop your bullet experiences at each distance. For example, a typical .308 load might drop about 1.0 mrad at 300 meters, 3.5 mrad at 500 meters, and 7.5 mrad at 700 meters. Instead of dialing 35 clicks at 500 meters, you simply place the 3.5 mrad hash mark on your target and fire.
The quality of your holdovers depends entirely on how accurate your drop data is. Print a small card with your mrad corrections at each distance and tape it to your stock or keep it in a pocket. With practice, you’ll memorize the common ones.
Wind Correction in Mrad
Wind calls are where mrad reticles really earn their keep, because the same hash marks you use for drop also work for lateral corrections. Estimating wind drift accurately is harder than compensating for gravity, but there are shortcuts that simplify the process.
One practical method ties your bullet’s ballistic coefficient (BC) to a “miles per hour rule.” Take the first digit of your bullet’s G1 BC, and that becomes your reference wind speed. A bullet with a .400 BC makes your rifle a “4 mph gun.” If the crosswind is blowing at exactly 4 mph, the wind drift in mrad at any given range roughly equals the range expressed as a decimal. At 300 yards (0.3), expect about 0.3 mrad of drift. At 600 yards (0.6), expect about 0.6 mrad.
If the actual wind is stronger or weaker than your reference number, scale proportionally. An 8 mph crosswind with a “4 mph gun” means doubling the hold. A 2 mph wind means halving it. For bullets with BCs that aren’t round numbers (say, .350), check a ballistic calculator once to decide whether rounding to 3 or 4 gives you closer results, then stick with that rule in the field. Beyond about 500 yards, less aerodynamic bullets may need an extra 0.1 mrad added as a correction factor.
FFP vs. SFP Scopes and Mrad Accuracy
Your scope’s focal plane determines when your mrad reticle measurements are actually correct. In a first focal plane (FFP) scope, the reticle scales up and down with magnification. This means the hash marks represent accurate mrad values at every power setting, whether you’re on 4x or 20x. You can range, hold over, and correct wind at any magnification.
In a second focal plane (SFP) scope, the reticle stays the same size regardless of zoom. The mrad markings are only accurate at one specific magnification, usually the highest setting. If you forget and try to range a target at half magnification, your reading will be off by a factor of two. SFP scopes work fine if you always dial your turrets, but they create a real risk of error if you rely on reticle holdovers at varying magnifications.
For anyone planning to use their mrad reticle actively for ranging or holding, an FFP scope eliminates an entire category of mistakes.
Mrad vs. MOA: Which System to Choose
MOA (minute of angle) is the other common angular system in rifle scopes. One mrad equals 3.438 MOA, so mrad uses coarser units with finer click values. A standard 0.1 mrad click moves impact 1 cm at 100 meters. A standard 1/4 MOA click moves it about 0.7 cm at the same distance. MOA gives you slightly finer per-click resolution, but mrad gives you simpler math.
The real deciding factor is consistency. Pick whichever system your reticle uses, and make sure your turrets match. An mrad reticle paired with MOA turrets forces you to convert between systems every time you make a correction, which is a recipe for errors under pressure. Most modern precision rifle shooters have moved toward mrad because the metric-friendly math is faster in competition and field use, but MOA works just as well if your entire system is built around it.