Use this cartographic calculation to convert, scale, or compare map, terrain, bearing, raster, or route quantities when the coordinate and unit conventions are explicitly known.

Contour Interval Meters (m)

Required number input.

Grade Percent (percent)

Required number input.

Horizontal spacing in metres between contours from vertical interval and grade percentage. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Horizontal Spacing Meters (m)

The resulting horizontal spacing meters returned as a number.

• Map calculations depend on datum, projection, latitude, scale definition, magnetic-declination epoch, and whether distances are planar, rhumb-line, or geodesic. A compact formula cannot remove distortion or infer the missing reference system.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm the map datum, projection, scale, and bearing convention before applying the result. Use geodesic or GIS software with current reference data when survey-grade or navigation-critical accuracy is required.

• Slope Degree Rise Run

  Incline angle in degrees from signed vertical rise and positive horizontal run.

• Vertical Exaggeration Factor

  Vertical-to-horizontal scale ratio from the horizontal and vertical 1:N denominators.

• Contour Density Per Cm Checker

  Number of contour crossings per map centimetre from a count along a measured map transect.