How to calculate distances on the map or in reality using the map scale

Learn basic calculations concerning the scale in maps: how to calculate the distance in reality from the distance on the map, and vice versa.

The scale of a map is actually a ratio, such as 1:200,000 or 1:35,000. A map scale 1:30,000 means that one unit (whether inch or centimeter) on the map corresponds to 30,000 such units in reality. That understanding is the basis for all the calculations we do.

Essentially, to go from the map to reality, you would multiply by that number 30,000, and to go from reality to the map you'd divide by it.

See also

Percentage of change — video lesson

Math Mammoth Grade 7 curriculum (pre-algebra)

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