🔭 Binoculars Range Calculator
Enter a target’s known real-world size and how many mils it subtends in your reticle to estimate its distance, using the standard mil-dot range formula.
How reticle range estimation works
Many binoculars and scopes include a mil-dot or milliradian reticle that lets you estimate distance to an object of known size by measuring how many ‘mils’ it spans in your field of view.
The formula
The standard mil relation is Distance = (Target Height × 1000) ÷ Mils Subtended, since one milliradian subtends 1 meter at 1000 meters distance. Height and distance must use the same length unit (this calculator uses meters for the target height).
Accuracy depends on how precisely you can measure the mils subtended and how accurately you know the target’s true height, so this is an estimation technique, not a precise rangefinder measurement. This calculator is for general outdoor and educational reference.