Map Scale and Distance Calculator

Calculate scale, distance on the map or real distance on Earth. Please enter two values, the third will be calculated.

An example: on a map with the scale 1:20000, 3 centimeters accord to 0.6 kilometers in reality.
1 cm ⇒ 20000 cm
3 cm ⇒ 20000 * 3 cm = 60000 cm = 600 m = 0.6 km

The scale is rounded to integers, the distance of the map to 0.1, the real distance to 0.001.

Scale: 1 :
Distance on the map:
Real distance:


Compare Scales

Calculate lengths from map scales and convert different scales. Enter the length of a distance on a map, the scale and the unit and click Calculate. Real length returns the real distance on Earth.

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Instruction activate JavaScript

Length on map
Scale A
1 :
Scale B
1 :

Real length A
Ratio of the two scales
Real length B
One unit on map A is equivalent to   units on map B.
One unit on map B is equivalent to   units on map A.