# Map Scale calculator

(provisional version)

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.

## Preparing the calculations

Before the calculation you need to determine your reference points and
there geographical coordinates.

(Last modified: January 9. 2018)

(Created January 1. 2018)