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Wndsn Range Calculator

High-precision range calculator. Companion to Wndsn Telemeters: Low tech, high utility graphical distance computers from the Wndsn applied science lab.

By way of using a Wndsn Quadrant or Telemeter measuring degrees or a hairline graticule measuring mil or moa or any other instrument or technique that returns the angular size of a known object, we can determine the distance to that object.

Calculate range.


Determine D (use any unit (cm, mm, inches, etc.) for S, at angular size α)


[Load sample values (JSON) (XML) (CSV).]


1        rad =  57.3    deg
6.2832   rad = 360      deg = 6283.2   mil = 21,600     minutes (moa)
0.017453 rad =   1      deg =   17.453 mil =     60     minutes (moa)
                 0.0573 deg =    1     mil =      3.438 minutes (moa)

See also