The purpose of this page is to estimated the scale of a (scanned) map using the Pythagorean theorem and based on the distance between two or more points on the image (in pixels) and the real distance between those points. More points means a better estimate. The calculation of the real distance is based on a square coordinate system like UTM. Any other coordinate system is OK, as long it is square and metric (for example the Swiss, the Dutch or the OSGB grid).
Although the calculators were incorporated in the web page using an iframe, you can (and may) download and use them locally.
Before the calculation you need to determine your reference points and there geographical coordinates.
(Last modified: January 9. 2018)
(Created January 1. 2018)