Tactical Mil-Dot Range Estimating
1 mil in a scope reticle is the distance from the center of one dot to the center of the next dot.
Set your scope at the highest power. View the target through the scope. Place the center of the dot against one edge of the target and measure to the opposite edge of the target.
Once the target has been measured in mils, use the input fields to the right to calculate the target distance.