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If the contour interval is not given, find two reference (labeled) contour lines and find the number of lines between them, excluding the reference lines themselves. Then the interval can be found using the following formula:

|(Difference between elevation of reference lines)|

/(Number of contour lines between reference lines +1) = Contour interval

For example, if you find two reference lines labeled 150m and 250m and there is one contour line between them, then

|150m-250m|/(1+1)=100m/2=50m

The contour interval of that map is 50 meters.

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