Milliradian Distance Calculator

Body Height or Weight Converter; Everything about. Need a scope for my 6. For the average hunter, this simply means than one mil-radian equals 3. To use this tool while in-game. To be specific, a milliradian represents a measure of the distance around the arc of a circle with a radius of one. Spatial Resolution and Satellite Scene Swath Beth Goralski Geog 581 What is Resolution?? 2 Resolution Criteria 1. In the metric system, "milli" is the prefix for 10-3. A very small amount that equates to 3. To begin with, first be aware that there is a way to use a duplex reticle to range your target but, a far more sophisticated method is to use a Mil Dot reticle which consists of a pair of crosshairs with round "milliradian" dots placed at equal intervals along the length of each crosshair. The distance between each dot is 1mil (1 milliradian or MRAD). The distance to spot ratios listed in Table 1 can be used to calculate the maximum distance for accurate temperature measurement. Hornady states a drop of 1271. , lens, digital sensor, and software sharpening). The space between the dot centers subtends one milliradian (Mil). The Mirador IV localises the target into an angular box cited at 4 milliradians, which falls well inside the 20 milliradian mainlobe angular coverage of the engagement radar. Simultaneous Operations on Parallel or Near-Parallel Instrument Runways (SOIR) Study Group, to assist the Secretariat in its work. Convert angle of milliradian (mrad) and minutes (' , MOA) units in reverse from minutes into milli-radians. Brutal, abusive, pounding, torturous…these are not words you hear when describing how precision optics are treated. The inputs to the calculator also follow the pink-purple-brown color coding. Mil-Dot, MOA – These reticle comes with crosshairs in minutes of angle or milliradian unit. To do this at home, all you need to do is take the yard line value as in the 4 from 4 00yds an times it by 3. As you say, since most are using range finders these days, it may be superfluous. range to a target. 5in (used as a bullet drop tool) A milliradian (mil) is derived from the number of degrees in a circle. The range of reticle adjustment increases with main tube size, which is why 30mm or larger tubes are preferred. Use grid-referencing to input position of mortar and target to get elevation (Milliradians) and Azimuth (Angle in °). 76 seconds (0. FUNDING NUMBERS 6. The mil is also referred to as thou. 26481 arcsecond. It also has a nice wind. Most scopes of this type will move have a. So if you are the person behind the trigger, then with such abilities, you can easily calculate the accurate distance of your target. distance, and (3) limited process knowledge, the Derived Air Concentration (DAC) fraction can be estimated. This page shows ranging formulas for various reticles and dimensional units. When it's zeroed at 100 yards shooting some nifty hand loads with Hornady's 140-grain ELD Match bullets, I can calculate the exact amount of bullet drop (or how much I have to aim "up. For sub-degree angular sizes (1° = 60 minutes or MOA), the MMC provides increased precision by allowing to directly input and calculate in MIL (milliradian) or MOA and thus can be used as a high distance/high precision companion to Wndsn Telemeters — it uses the same principles of calculating distance from angular size, only that with the. The reason is because you can divide literally ANY unit of measurement into quarters or tenths. Currently there are. The expression used to calculate the stress for pure rotation is where S = stress, E = material modulus of elasticity {1. Laser Divergence Calculator - divergence matters: Beam behavior over distance The beam divergence describes the widening of the beam over the distance. True Ballistic Range (TBR) technology and a built-in inclinometer can calculate the ballistic range to your target, then display it as a holdover point of aim, an MOA adjustment, a Milliradian adjustment. Milradian calculations. This is inches per yard. MOA reticle distance estimation formulas are…. For example, 1 mil at 100 yards equals 3. If you are 300 meters away 1 militadian will be 3/10 of meter. Horus Products The Most Innovative, Accurate, and Easy to Use Targeting Solutions on the Market. Since most modern cartridges shoot flat enough for hunting out to 100-150 yards including the 22LR most of us never really have to think about any significant holdovers. It also has a nice wind. When applied to a circle the number we use is 6283. I found a code that works in Psychtoolbox to generate the gratings. It is essential to know how far your bullet will drop while traveling a particular distance. Most scope dials have 1/4-minute "clicks. It's about 3 minutes of arc. How to Calculate Distances With a Mil Dot Rifle Scope. 44 MOA so, by rounding down, you take into account the flatter trajectory of your rifle and you can hold on the crosshairs as you have become used to doing. if a shot requires a 4. 91 = Centimeter value of each minute of angle 2. Get all Sightron manuals! T arget can also be calculated if the distance is known. Furthermore, 3. Ederer for free with a 30 day free trial. Minute of arc (n = 21,600). That’s all fine and cool, but what I like most about the mil-dot system is that it can be used to figure out the distance to a target, just by looking through your optic. Bare bones true mil dot reticle. 1258 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. hill, ridge, or bank. Demo Steiner T1042r 10x42 Binocular with SUMR Milliradian Ranging Reticle reduced from $649. How many inches in a mil: If L mil = 1 then L in = 0. Plugging those values into the milliradian formula, we find that the target is 157 yards away. Which at 100 metres would be one centimeter. Since most modern cartridges shoot flat enough for hunting out to 100-150 yards including the 22LR most of us never really have to think about any significant holdovers. Simply put, the Mil-Dot is a range estimating reticle that was developed for military applications. For example, on a target moving 10 mph the distance covered is 20" @ 100 yards, but 114" @ 500 yards on one of my. The mil-dot reticle was designed around the measurement unit of the milliradian. Phone: (877) KENTON-1. com A collection of really good online calculators for use in every day domestic and commercial use!. Therefore, while a milliradian subtends 1 yard at 1000 yards the angular mil will subtend just 35. Calculate the vertical distance using the equation. 086° off center, a 4 milliradian beamwidth edge occurs 0. Which variable is the best. This is inches per yard. US are 6400. A milliradian translates to 36 inches at 1,000 yards, so at 100 yards, a mil is 3. To shield from enemy fire or observation by using natural or artificial obstacles. Converting NASA's measurement of the Earth's radius into meters and substituting it in the formula for arc length, we find that each degree the radius line of the Earth sweeps out corresponds to 111,139 meters. With a bit of training and understanding of how they work, you can quickly calculate distance and bullet drop trajectory. Mildot reticle A scope reticle designed around the measurement unit of a milliradian. In order to calculate the angular distance \theta in arcseconds for binary star systems, extrasolar planets, solar system objects and other astronomical objects, we use orbital distance (semi-major axis), a, in AU divided by stellar distance D in parsecs, per the small-angle approximation for :. A milliradian, often called a mil or mrad, is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0. The term is relevant only in the "far field", away from any focus of the beam. The utility of this measurement standard goes beyond simply having a number to describe your shooting. 6, DECEMBER 2013 and in-depth experimental study of gyrocompassing methods. 99 x 1011 N/m2 (29 x 106 psi) for 420 CRES), t = flexure thickness, e = angle through which the pivot is rotated (in radians), and L = effective flexure length. Short-Range Technique. 05 cm or 1/2 mil on some scopes (zeiss in particular). Being a military unit of angle, the U. 6in/100yard. 001)*100*36 = 3. 5 Miliradian increments with larger hash marks indicating 1 Mil increments while the upper vertical and both horizontal ends of the reticle are marked in. The center of each dot, or box or line, depending on the scope manufacturer, is 1 milliradian away from the next dot's center. Though shooters carry the terms as common coin, not everyone can define "minute of angle" and "mil" (short for "milliradian"). 3 Mils = 1 MOA at any distance. Worksheet for Calculating 0. Understanding MRAD vs MOA is more than just mastering the math of the MRAD to MOA conversion. - Built-in inclinometer with TBR that can calculate the ballistic range to your target, then display it as a holdover aim point, an MOA or a Milliradian adjustment or the equivalent horizontal distance. COURSE LENGTH: 40 Hours (5 Days) COURSE OVERVIEW. Laser Divergence Calculator - divergence matters: Beam behavior over distance The beam divergence describes the widening of the beam over the distance. One mil approximates one meter at a distance of one thousand meters, or in other words if a 1 meter long object measures 1 milli-radian then it is 1000 meters away. One mil translates to approximately one metre at a distance of one thousand metres. Distance between two MilDots = 1 milliradian = 3. - CR2 lithium battery - Powered with DNA (Digitally eNhanced Accuracy) which delivers enhanced accuracy, speed and range. 6 inches per 100 yards. The radian equals approximately 57. For additional reticle ranging information v. depend on the laser range finder of your primary sight to determine the. 99% of shooters never have to consider at ranges under 150 yards. Scopes can be purchased in Y4 or Y8 MOA or milliradian adjustments. I say the laser does obey the inverse square law, but you have to consider the distance traveled within the laser. 6 milliradian to arcsecond = 1237. The distance is ten times further, so the mil represents a space that's ten times larger – get it? Here's what the distance from dot-to-dot measures at 100-yard increments. Available for both AR-15 and AK-47 rifles. It looks like a series of dots on your reticle cross-hairs, and the MIL measurement is the distance from one dot to another. The online Laser Hazard Distance Calculator uses the equations below. Therefore 1 Radian is equal to (180/π) degrees. This is a discussion on Milradian calculations within the SOP forums, part of the Sniping Related category; Hi guys, I've bought a new scope that has a mil reticle and I'm trying to convert my ballistic data from inches to cm and. The center of each dot, or box or line, depending on the scope manufacturer, is 1 milliradian away from the next dot's center. April 9th, 2012 Mil Radian Defined and Mildot Scope Use Demonstrated. typically to milliradian or seconds of arc. Miliradian Based reticle is designed to allow the shooter to measure targets to determine the distance and then make corrections by either dialing or using the reticle for bullet drop compensation. 6000012 inches. 6 inches at 100 yards. Go ahead and type. For sub-degree angular sizes (1° = 60 minutes or MOA), the MMC provides increased precision by allowing to directly input and calculate in MIL (milliradian) or MOA and thus can be used as a high distance/high precision companion to Wndsn Telemeters — it uses the same principles of calculating distance from angular size, only that with the. 05922 arcsecond. In the metric system, "milli" is the prefix for 10-3. To convert degrees to radians, take the number of degrees to be converted and multiply it by π/180. 2 Calculating Distance with MOA To calculate a target's distance with MOA, multiply the known size of the target in inches by 95. 438moas and 3. then you lock the scope down so the mag cant move. A NATO Mil, however, is 1/6400 of a circle. hooting vs concealment the emphasis is more on prep for the shot, the shot and then a whole bunch of analysis about the shot, where it went and why. You can calculate this by converting both numbers into fractions. 9 within the Camera Land forums, part of the Vendors category; Demo Steiner T1042r 10x42 Binocular with SUMR Milliradian Ranging Reticle reduced from $649. The height of the target is the unknown and the distance to target is known (100 yards). 5 hundred yards, or (for the non-mathematically-inclined, a calculator is useful here) 2. Easy peasy lemon squeezy. The time is automatically recorded and put into the equation by the onboard clock. The distance traveled is then 2. 4m(+10D)=4x. If a secant and a tangent of a circle are drawn from a point outside the circle, then the product of the lengths of the secant and its external segment equals the square of the length of the tangent segment. 28 radians on a circle equating to 6280 milliradians. 2832 radians in a circle) and 1 MIL equals to 3. Superior to duplex reticles, this floating three-plex design utilizes all the functional elements of a duplex without unnecessary obstructions of your field of view at the 12 o’clock and 6 o. A 6" group at 250 yards is equal to 6" divided by 2. The "angular mil" is about 98. 4 div/by # of mills = distance to target in METERS Height of target in INCHES x 27. , 2 for 200 yards, 3 for 300 yards, etc. BDC and Mil-Dot Reticles for Rifle Scopes Milliradian is the technical term, as is Minute of Angle. Between ' , MOA and mrad measurements conversion chart page. 5 milliradian. The SCENE is measured horizontally and vertically - horizontal width (in feet) and vertical height in feet). This is a 1 page addition to your book. To do this at home, all you need to do is take the yard line value as in the 4 from 4 00yds an times it by 3. Tactical Mil-Dot Range Estimating. It is good enough for what I need but I would like to use cycle per degree of visual angle instead of spatial frequency in 1/pixels. It's always going to be a journey to properly maintain and hone your skills. The unaided is easily fooled by variations in lighting, the type of landscape etc. Most hunting scopes are available with turret adjustments in ¼ MOA “click” increments. Does that make sense?. MOA and MRAD calculations for bullet drop The sniper calculator's hold over you can change with different magnification settings. It's always going to be a journey to properly maintain and hone your skills. 2832 radians in a circle) and 1 MIL equals to 3. When it's zeroed at 100 yards shooting some nifty hand loads with Hornady's 140-grain ELD Match bullets, I can calculate the exact amount of bullet drop (or how much I have to aim "up. Tactical Mil-Dot Range Estimating. Hornady states a drop of 1271. 000239 times the distance. Distance shooting has always been a complex puzzle to solve with variables 99. So, 1 milliradian is 1/1,000th of a radian. It may be very helpful for all people dealing with mathematics and tackles mathematic problems. The second type of holdover reticle features hash marks spaced equally on both crosswires, typically spaced in minutes of angle (MOA) or Milliradian (Mil) gaps. CDP is a metric for the distinguishability from two input light levels through an imaging system. Discrete Fourier Transform: A typical MTF plot is really only one-dimensional (e. 05m or 5 cm. The formula I have now works great if it is in the right hemisphere of the circle. The calculator uses the following formula: Clicks = (amount of desired bullet impact location movement / amount of scope movement per click) x (adjustment distance specified on the scope / distance to the target) The calculator is provided "as is" without warranty of any kind, either expressed or implied. The end of the spacing after the fourth dot can be considered a fifth dot, and with some intuition, the placing of a theoretical sixth dot can be guessed. 1 milliradian to arcsecond = 206. 6 inches at one hundred yards. There are several distinct definitions but all approximate to a trigonometric milliradian. At what distance would it have to be so that it would have the same angular size as the Moon (about 30 minutes of arc) ? We want to solve for distance, so we click that button. The HCD mode is the primary one available and measures distance while compensating for angle automatically. Sig’s excellent LRFs get an upgrade in the form of Kilo2200 and Kilo2400. For sub-degree angular sizes (1° = 60 minutes or MOA), the MMC provides increased precision by allowing to directly input and calculate in MIL (milliradian) or MOA and thus can be used as a high distance/high precision companion to Wndsn Telemeters — it uses the same principles of calculating distance from angular size, only that with the. It's an angular measurement that relates the angular measurement of milliradians to the linear measurement of distance. The shortest distance between two points on the surface of a sphere is an arc, not a line. Becoming a master at long distance shooting is never going to be a destination. How many inches in 17 mils: If L mil = 17 then L in = 0. 001)*100*36 = 3. Need a new scope at an affordable price?. 32403 arcsecond. More specifically, a radian is the measurement of the arc created when two radius lines start at the center and end at the circumference of a circle. Repeat this exercise at 350, 400, and 450 yards or at whatever distance you want, recording the correct magnification setting at each range. 1 mil in a scope reticle is the distance from the center of one dot to the center of the next dot. The other way around, how many milli-radians - mrad are in one minute - ' , MOA unit? Calculate from angle into other angle unit measures. Yet if you tried to think in inches or cm, the calculation gets rougher than just noting the angular lead. This area on the ground is called the resolution cell and determines a sensor's maximum spatial resolution. Therefore, while a milliradian subtends 1 yard at 1000 yards the angular mil will subtend just 35. A couple of things both MOA and MRAD are angular measurements and not fixed values, I agree one milliradian (MRAD) is a little easier to understand as it is 1/1000 of the distance whereas 1 MOA is roughly 0. To do this, use the equation: Distance to the target in yards ÷ 100 = Inch value of each minute of angle or (Distance to the target in meters ÷ 100) x 2. depend on the laser range finder of your primary sight to determine the. Using this method, a circle is first divided into 6,400 equal parts such that one mil-radian equals 1/6400th of a circle. A milliradian is 3. Note that the vertical distance uses the maximum elevation angle. Both MOA and mils are used to measure angles. minimum spacing (see Reference 2). Rate gyros are used to measure turning about a single axis. One of the nice things about circular slide rules is that you'll never run into the "run the cursor off the end of the. The TEM(oo) beam from a typical helium neon laser will display a 0. Eye relief — Eye relief is the distance from the rear eyepiece lens to the exit pupil or eye point. The mil used by the US military and NATO forces is slightly different than the true value of a milliradian, which is equal to 1/6,283 of a circle. Basic moving lead correction 2. ›› Quick conversion chart of milliradian to arcsecond. Metric Conversion Calculator. A milliradian, often called a mil or mrad, is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0. 001 radians (one milliradian) * at 100 meters =. A milliradian is an angular unit of measure that just happens to equal one yard at 1000 yards and 1 meter at 1000 meters. 001 of a radian. For example, Swarovski's online calculator lets you select the magnification you want to use before it runs the calculations. 1 Mil Target Knob Settings 25-Yard Increments, 100 to 2000 Yards By Major John L. 25 MOA increments. Measurement Unit (IMU) Influences the Miss Distance of a Gun-Launched Precision Munition. There are 60 minutes in a degree. 6 = Inch value from the center of one mil mark to the center of the next at that distance or. 05 cm or 1/2 mil on some scopes (zeiss in particular). a milliradian represents. 05m or 5 cm. Some authors develop analytical models to calculate uncertainty taking into account and only one of these must move with sub-milliradian. You know that a MOA spreads out 1″ per 100 yards, so 1 MOA at 300 yards is 3″. In this article, I tried to cover the important factors that are necessary to choose the rifle scope. moving leads will require knowing yardage distance, wind speed, moving target speed and total bullet flight times inc. Built-in inclinometer with TBR that can calculate the ballistic range to your target, then display it as a holdover aim point, an MOA adjustment, a milliradian adjustment, or the equivalent horizontal distance; Digitally eNhanced Accuracy (DNA) delivers increased accuracy, speed and range; Fully multi-coated lens system ensures a bright. The advanced line of sight mode helps to calculate long distance for far away targets, even if they or you are a high angle. 6 = Inch value from the center of one mil mark to the center of the next at that distance or. 001 of a radian. tan(milliradians / 1000) = Height of target / (Distance to target * 36) The number of milliradians is read off of the reticle. THE MILLIRADIAN The term “MIL” is and abbreviation of the angular unit of measurement called the MILLIRADIAN. The needle aligns itself with the horizontal component of the earth's magnetic field line. In conventional mode, the M224A1 weighs approximately 37. The distance from the center axis of the rifle barrel to the center axis of the scope. Convert 1 ' , MOA into milliradian and minutes to mrad. Since a radian is defined as the angle formed when the length of a circular arc equals the radius of the circle, a milliradian is the angle formed. In order to calculate the lead, one must approximately know the speed of the moving target and the distance to it. Bullet flight times can be roughly calculated based on fps velocities or a ballistic calculator. A milliradian is an angle representing radian/1000. 001 into your calculator and hit the "tangent" button. This means that at 100 yards, 1 degree of angle measures 62. Most scope dials have 1/4-minute “clicks. Welcome to the Predator Masters Forums and know how many hashes of elevation it takes to get to that distance, and you know your wind deflection in hashes, and. 001 × 17 = 0. Milliradians are used in artillery to estimate the distance to a target. All without wasting a single round of ammunition. Milliradians can be abbreviated as mrad, for example 1 milliradian can be written as 1 mrad. A radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. A milliradian, often called a mil or mrad, is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0. The main advantage of this scope design is it allows the sniper to aim at a target and calculate the distance to the target at the same time. Therefore, determining the twisted atomic. It takes into effect things like atmospheric conditions, wind, and even allows you to make projections shooting both up and down hill. A milliradian, sometimes called a mil or MRAD, is 1/1000 of a radian. Brutal, abusive, pounding, torturous…these are not words you hear when describing how precision optics are treated. Therefore, while a milliradian subtends 1 yard at 1000 yards the angular mil will subtend just 35. In imperial, dot spacing is 3. A milliradian is an angular unit of measure that just happens to equal one yard at 1000 yards and 1 meter at 1000 meters. 001)*100*36 = 3. 0573 milliradians and there are 6,283 milliradians in a full revolution /circle. In some earlier posts to this Mauser M03 Blog I promised to see if my M03 270 Win and 30-06 barrels could produce better accuracy with hand loads than with the factory ammunition I'd been using so far. I found a code that works in Psychtoolbox to generate the gratings. But that is exactly what we inflicted upon a Nightforce NXS 5. 3 milliradian to arcsecond = 618. 001 radian). SNIPER CALCULATOR. 0029 inches. 6000012″ So, one milliradian is just over 3. 2 inches at 200 yards. 6 inches at one hundred yards or 36 inches at 1,000 yards is exactly how we want to use the mil. 99 x 1011 N/m2 (29 x 106 psi) for 420 CRES), t = flexure thickness, e = angle through which the pivot is rotated (in radians), and L = effective flexure length. I know it is a nit, but in checking your distance equations using MIL and MOA, I find the MIL equations to be correct, however I believe the MOA equation should use 95. Ederer for free with a 30 day free trial. :lol: However, if you don't want to do that, take the correction in inches, multiply that by. At what distance would it have to be so that it would have the same angular size as the Moon (about 30 minutes of arc) ? We want to solve for distance, so we click that button. For example, on a target moving 10 mph the distance covered is 20" @ 100 yards, but 114" @ 500 yards on one of my. The scale factor of which is approximately 12 millivolts per milliradian of float displacement. When debug mode is active, all impact data is displayed. Standard Ballistics Calculator. But that is exactly what we inflicted upon a Nightforce NXS 5. The mil is also referred to as thou. Kilo2400 doubles the price tag and adds a sophisticated ballistic calculator and a wind meter that plugs into your smartphone. edu is a platform for academics to share research papers. Ederer for free with a 30 day free trial. 25 inches at 100 yards. 45 milliradians per degree, so 360 degrees equals 6,282 milliradians. The first thing you need to know is that MRAD, also called MIL, refers to "milliradian. 44 MOA so, by rounding down, you take into account the flatter trajectory of your rifle and you can hold on the crosshairs as you have become used to doing. Here’s where the proportions come into play. For very small angles, it's sometimes useful to know that 1 radian = 206265 seconds of arc, approximately. In the military, angles are measured in milliradians - a thousandth of a radian (0. 4m(+10D)=4x. This information will inform you the shooter to the danger space, under shot, over shot, and point blank ranges of each ZERO you use. distancesfrom. Some additional notes: most mil-dot scopes actually show one mil (milliradian) per dot at 10x. It can be expressed with below binoculars distance formula: d = h * 1000 / Mil. uses the angle measured by a milliradian. Plaster, USA (ret) In a previous article I explained how to convert inches of bullet drop or wind drift into tenths-of-a-mil, for use with the 0. If you divide that imaginary circle into 360 degrees or 360 pie slices, and you walk out and measure the distance between those degrees or slices, that distance would be 62. Using this method, a circle is first divided into 6,400 equal parts such that one mil-radian equals 1/6400th of a circle. Get Sightron Riflescopes Manual. Though shooters carry the terms as common coin, not everyone can define “minute of angle” and “mil” (short for “milliradian”). A unit of angular measure that is subtended by one unit of length at a distance of 1,000 units of length, such as one meter at a distance of 1,000 meters. The milliradian is a multiple of the radian, which is the SI derived unit for angle. 40 m and the magnifying lens power was +10D, then the angular mag = M = 0. It looks like a series of dots on your reticle cross-hairs, and the MIL measurement is the distance from one dot to another. The advanced line of sight mode helps to calculate long distance for far away targets, even if they or you are a high angle. These targets are designed to take advantage of the human eye's natural tendency to center an object within a circle. As above, since it's an easily worked out formula of distance / 1000 to work out the millirad, it doesn't matter what the distance, it will always be a (fairly) simple calculation. When applied to a circle the number we use is 6283. For greatest accuracy, one should be conservative in applying these numbers. No matter which cartridge holdovers you calculate, you always use the data below for the width of a mil, from dot-to-dot. For distances other than 100 yards, you can do it the easy way or the hard way. * I use the term "length" because. I'm designing a laser to shine a dot at a breath-taking 68 kilometers over a frozen lake in Hungary. The only piece of missing information is the distance between us and the formerly-epic example of investigative journalism. Distance from Earth; Ellipticity (Flattening) Equatorial Radius; Length of Day; Mass; Mean Density; Mean Longitude; Number of Natural Satellites; Semimajor Axis; Surface Area; Surface Gravity; Surface Pressure; Temperature; Volume; Volumetric Mean Radius. If this is not listed, here are some example Class 4 lasers: The Nominal Ocular Hazard Distance (NOHD) for a 1000 milliwatt (1 Watt) visible-beam laser with 1 milliradian divergence is 740 ft (225 m). 3 milliradian to arcsecond = 618. One Mil equals about 36 inches per 1000 yards or 3. With the calculator in "radian" mode, type: tan-gent (. Or you could go to the dollar store and buy that same calculator. 22 data card and that was easy enough, as the scope functions in 1/4MOA increments.