Line of Sight Calculator


About Line of Sight Calculator (Formula)

A Line of Sight Calculator is a tool used to determine whether a direct visual line exists between two points, considering obstacles or terrain features that might obstruct the line of sight. This calculator is essential in various fields such as telecommunications, surveying, navigation, and urban planning.

The formula for calculating line of sight involves understanding the curvature of the Earth and the height of obstacles:

Line of Sight = √(2 * Earth’s Radius * (Height of Point A + Height of Point B) + (Height of Point A)² + (Height of Point B)²)


  • Line of Sight is the distance between two points along the curved surface of the Earth that allows for a direct visual line.
  • Earth’s Radius is the radius of the Earth, typically around 6,371 kilometers.
  • Height of Point A is the elevation of the first point.
  • Height of Point B is the elevation of the second point.

To use the Line of Sight Calculator formula, follow these steps:

  1. Determine the heights of both points (Height of Point A and Height of Point B).
  2. Plug the values of Earth’s Radius, the heights of both points, into the formula.
  3. Calculate the line of sight distance. The result indicates the distance between the two points that allows for a direct visual line considering the curvature of the Earth and obstacles.

This calculation is particularly useful in scenarios such as planning the placement of communication antennas, determining the visibility between observation points, and assessing line of sight in navigational systems.

Keep in mind that the Earth’s curvature plays a significant role, especially over longer distances. Obstacles and terrain variations can also impact line of sight, so accurate elevation data is crucial.

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