**What is the contour interval equal to? Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. In the example above, the distance 200 is divided by the number of lines, 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.**

## How to Calculate Contour Interval?

A contour interval is the elevation difference between two adjacent contour lines. To calculate the contour interval, you need to know the elevation of at least two points on the map.

The contour interval can be found by subtracting the lower elevation from the higher elevation. For example, if point A has an elevation of 10 m and point B has an elevation of 20 m, the contour interval would be 10 m.

This is because the difference between the two elevations is 10 m. The contour interval can also be calculated by looking at the scale of the map.

The contour interval is usually given in the legend of the map. For example, if the contour interval is 1:24,000, this means that there is an elevation difference of 40 feet between each contour line.

To calculate the contour interval, you first need to find the contour interval on the map. This can be done by looking at the legend of the map.

Once you have found the contour interval, you can calculate the elevation difference between two points by using the formula: Elevation Difference = (Contour Interval) x (Map Scale) For example, if the contour

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