on the map itself it usually says how much an inch is. usually in the lower right corner.
To find how far an inch is on a map, look for the map scale. It will indicate how many miles is in an inch.
You would look at the scale on the map.
Map scale
In the key
You would look for the map's scale, which is typically provided in a legend on the map. The scale will indicate the ratio between a unit of length on the map (such as an inch) and the actual distance it represents in real life. This ratio allows you to convert distances on the map to their real-world equivalents.
The map scale is usually located in the legend box of a map.
The key.
That thing is called a scale. It typically appears as a line marked off in miles, kilometers, or other units, showing the corresponding distance on the ground that each unit on the map represents.
it's called a scale
there should be a key on the map and that is most likely where you can find that info. : )
3/4 of an inch
You find that out by looking at the map's scale bar.