Vortex Optics RAZOR HD GEN II 3-18X50 RIFLESCOPE - Manual (Page 4)

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Ranging a 6-foot target (72 inches) at 12 MOAs yields 573
yards.
Example
72 x 95.5
12 MOA
573 Yards =
Using either the vertical or horizontal MOA scale, place the
reticle on a target of known dimensions and read the number of
MOAs spanned. You will obtain maximum accuracy in ranging
by calculating exact MOA measurements. MOAs should be
estimated in 1/4s if possible.
Accurate measuring will depend on a very steady hold. The
rifle should be solidly braced using a rest, bipod or sling when
measuring. Once you have an accurate MOA reading, use the
formula to calculate the distance.
Note: In the MOA ranging formula, a shooter may substitute
100 for 95.5 in the interest of speedier calculations. Be aware
that this will produce a five percent over-estimation error of the
yardage distance obtained.
Target Size (Inches) x 95.5
Measured MOAs
Range (Yards) =
MOA Ranging Formulas
Ranging
MOA measurements are very effective for ranging using a simple
formula. To use this formula, the shooter needs to know the size of
the target or nearby object in inches.
Target Size (CM) x 34.37
Measured MOAs
Range (Meters) =