It actually depends on the type of map - but if all distances on the map are supposed to represent equal distances in the real world, you can refer to the legend of the map where there should be a scale indicating the ratio of map distance to actual distance - for example, there might be a line at the bottom that is 1 inch long that is labeled "1 mile" meaning that if 2 points on the map are 3.5 inches apart, they are 3.5 miles apart in the real world.
If the map covers a big enough area however, you run into the problem that you can't perfectly represent a curved surface on a flat map. If the map is for a small enough area, the discrepancy is negligible, but when a map is covering thousands of miles, the discrepancy starts to become noticeable and you have to compensate for it.
what helps you find the measurements are the scales.
Use the scale printed on the corner of the map and a ruler. If it's not a straight route it might be easier to use a piece of string.
A graphic scale is the printed ruler on a map.
The maps scale markings.
scale
Legend
Water
A map scale lets you convert map distance to ground distance.
Describes and explains methods used to measure distance while navigating a map with a compass
The scale drawn on a map allows distance on the map to be measured. A scale of 1:50 000 means that 1 centimetre on the map represents 50,000 centimetres on the land.
The map scale often will show distance in both miles and kilometers. In that way, the map is useful no matter what measure the person normally employs.
Multiply distance by the scale bar
The map scale is a part of the map that is used to measure distance. The map scale can often be found in or around the map legend.
distance
Using a ruler which marked by Centimeters will more helpful to measure the distance of a map.
If you look at the bottom of the map, there should be a scale. Take a ruler, measure the distance for each measurement, and convert to what you need
Miles
IT tells you how to measure the distance on a map amoung other things.
the scale
Scale
It explains what a specific symbol or color means and how to measure distance on that map.
Multiply distance by the scale bar
Multiply distance by the scale bar
describe how to measure distance using topographic map?