**Figuring range in mils is simple**

Hello, everyone, this is my first post here, so here goes! :lol:

DOWDegan,

Figuring ranges using milliradians (mils) is easy once you realize that the units DON'T MATTER, as long as they are consistant throughout the formula.

The range formula for a mil-dot reticle is:

(Targets actual size (units) x 1000) / Apparent size of target in mils = Range to target in (units)

(units) can be whatever units you want to use. All you really have to know is that an object that subtends one milliradian will be 1000 times it's actual size away from you. An object that is 1 meter tall that subtends one milliradian will be 1000 meters away. An object that is 30 inches tall subtending one mil is 30,000 inches distant. Units don't matter except that the units you put in will be the units you get out.

If you know or estimate the size of the target in inches, the output range will be in inches. If you use yards, the range output will be in yards, meter gives you meters, etc... Understand?

To explain further...

Knowing the range to the target in inches isn't that helpful for most people, but if you're from the United States you are probably most familiar with a comfortable measuring short distances feet and/or inches.

For instance, say I'm looking at a deer through my mil-dot reticle. I know that the typical mature whitetail buck is roughly 20" from back to briscuit, and this distance measures 2.4 mils in my reticle. So I plug these numbers into my equation:

(20 inches x 1000) / 2.4 mils = 8,333 inches range to target (rounded to the nearest inch)

Now, I don't know about you, but 8,333" doesn't help me out much, but yards I can handle, so I convert inches to yards by dividing my answer by 36, which gives me 231.5 yards. We'll call it 232 yards because 1/2 a yards doesn't really matter at this range. With my 257 Wby, this shot is just point-n-click, no adjustments needed for a deer sized target.

Now, if you want to go high speed/low drag, you can integrate the conversion right into the original mil range formula and save yourself a step, and this is why you'll see the equation look different with different units of input and output. In the case of using inches for the input and getting out yards, one can simply divide the 1000 by 36 and plug it back into the formula so it would look like this:

(Actual size of target in inches X 27.78) / apparent size in mils = range in yards

Note that 1000 / 36 = 27.78

If you know inches, but your drop chart is in meters you'd convert the inches to meters and the range formula looks like this:

(Actual size in inches X 25.4) / Apparent size in mils = range in meters

you get 25.4 because 1" = 2.54cm. To further convert cm to meters you'd divide 2.54 by 100 then multiply that number by the 1000 in the original formula and substitute. So:

(2.54 / 100) x 1000 = 2.54 x 10 = 25.4

You can use whatever input unit you want, as long as you know how to convert the output to a unit value that you can use. Of course, you can plug any unit into the original formula and get a result in those same units, then convert. Or you can take a shortcut and change the formula to do the conversion in one step.

Does this answer your question?

Mike