Enter the distance to the surface (in) and the angle of the beam (radians) into the Calculator. The calculator will evaluate the Beam Spread.

## Beam Spread Formula

BS = 2*D*tan(A*.5)

Variables:

- BS is the Beam Spread (in)
- D is the distance to surface (in)
- A is the angle of the beam (radians)

To calculate Beam Spread, multiply the distance to the surface by 2, then multiply by the tangent of half the beam angle.

## How to Calculate Beam Spread?

The following steps outline how to calculate the Beam Spread.

- First, determine the distance to surface (in).
- Next, determine the angle of beam (radians).
- Next, gather the formula from above = BS = 2*D*tan(A*.5).
- Finally, calculate the Beam Spread.
- 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.

distance to surface (in) = 30

angle of beam (radians) = 14