Enter the diameter of the object and the distance to the object into the Calculator. The calculator will evaluate the Beam Field Angle. 

Beam Field Angle Formula

BFA = 2 * atan (D/2d) *57.2958

Variables:

  • BFA is the Beam Field Angle (degrees)
  • D is the diameter of the object
  • d is the distance to the object

To calculate Beam Field Angle, multiply the arc tangent of the diameter of the object over the distance to the object times 2, by 2, then multiply by 57.2958.

How to Calculate Beam Field Angle?

The following steps outline how to calculate the Beam Field Angle.

  1. First, determine the diameter of the object. 
  2. Next, determine the distance to the object. 
  3. Next, gather the formula from above = BFA = 2 * atan (D/2d) *57.2958.
  4. Finally, calculate the Beam Field Angle.
  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.

diameter of the object = 3.5

distance to the object = 30