Enter the grid scale factor and the elevation factor into the Calculator. The calculator will evaluate the Combined Scale Factor. 

Combined Scale Factor Formula



  • CSF is the Combined Scale Factor ()
  • GSF is the grid scale factor
  • EF is the elevation factor

To calculate Combined Scale Factor, multiply the grid scale factor by the elevation factor.

How to Calculate Combined Scale Factor?

The following steps outline how to calculate the Combined Scale Factor.

  1. First, determine the grid scale factor. 
  2. Next, determine the elevation factor. 
  3. Next, gather the formula from above = CSF = GSF * EF.
  4. Finally, calculate the Combined Scale Factor.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

grid scale factor = 1.34

elevation factor = 2.87


What is a grid scale factor and how is it determined?

A grid scale factor is a numerical value that represents the ratio of distance on a map to the corresponding distance on the ground. It is determined based on the specific projection and grid system used in mapping, taking into account the geographical location and elevation of the area being mapped.

What role does the elevation factor play in calculations?

The elevation factor adjusts the scale factor to account for differences in elevation between the map surface and the actual ground level. This is crucial for accurate distance and area measurements, especially in areas with significant topographical variations.

Can the Combined Scale Factor be used for all types of maps?

While the concept of a Combined Scale Factor is applicable to various types of maps and projections, the specific calculation and its applicability can vary depending on the map’s purpose, the accuracy required, and the projection used. It is most commonly used in engineering, surveying, and construction projects.

How does the Combined Scale Factor affect map accuracy?

The Combined Scale Factor is crucial for achieving accurate measurements on maps and in geospatial projects. By accounting for both the grid scale factor and the elevation factor, it ensures that distances, areas, and other geometric properties are correctly represented, minimizing errors due to projection and elevation differences.