binocular range markings...???

Its actually pretty simple but can look complicated.

Normally each mil line is 5mils so if you look through the binos and the target fills 2 lines you mil factor is 2x5=10.
Step to estimate the height of the target lets say its human two meter 2 meters tall. the formula is 2/10 =.2
.2 x1000 =200 meters to the target.