**To find contour interval divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. For example, if the distance 200 is divided by the number of lines, where the number of lines is 5.**

## How Do You Find the Contour Interval?

A contour interval is the elevation difference between contour lines on a topographic map. The contour interval is an important tool for understanding the shape of the land.

To find the contour interval, look at the legend on the map. The contour interval will be listed in the legend. The contour interval is usually given in feet or meters.

For example, if the contour interval is 10 feet, that means that each contour line on the map is 10 feet higher or lower in elevation than the contour line next to it.

If you‘re looking at a map that doesn‘t have a legend, you can usually find the contour interval by looking at the index contours. The index contours are the thickest contour lines on the map.

The number of the index contour will be the contour interval. For example, if the number of the index contour is 40, that means the contour interval is 40 feet.

Once you know the contour interval, you can use it to estimate the elevation of any point on the map. To do this, find the contour line that surrounds the point you‘re interested in. Then, count the number of cont

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