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Tool for calculating lengths according to drawing scales / maps scales / plans scales from the length as it is drawn or as actually measured.

Answers to Questions

How to calculate a map scale?

A scale of a map is a ratio, a fraction between 2 numbers, the first represents the value measured on the map, the second its correspondence with the actual value of the element.

Example: 1:100 is read 1 to 100 or 1 hundredth scale and means that 1 unit on the map corresponds to 100 units in reality. It can be 1cm (which will be 100cm) or 1km (which will be 100km). The plan is a shrinking 100 times smaller than reality.

Example: 2:1 reads '2 to 1' and means that 2 units on the plane correspond to 1 in reality. This means that the plane is a magnification 2 times, a zoom x2 of reality.

How to measure a length on a map to scale?

If a map is scaled, its measurements are proportional to reality, the coefficient of proportionality is the inverse of the value of the scale.

Example: 2cm on a scale map 1:10 (ie 1/10 whose inverse is '10/1 ') corresponds to 2*(10/1)=20cm in reality.

Conversely, starting from a real length, its multiplication by the scale makes it possible to calculate its length on the map.

Example: 20cm actually represent 2cm on a scale map 1:10 because 20*(1/10)=2cm

Source code

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