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Beam Diameter Calculator

Compute spot diameter = 2d·tan(θ/2) from beam angle and distance.

Input Data

Input Beam angle θ.
°
Input Distance d.
m

Results

1.0718m
diameter = 2d·tan(θ/2).

At a glance:Beam Diameter Calculator: enter parameters to compute results; complements related calculators.

Formula

diameter = 2·d·tan(θ/2).

How to Use

  1. Enter beam angle (deg) and distance (m).
  2. It returns spot diameter.

Case Studies

θ=30°, d=2 m → diameter≈1.072 m

diameter = 4·tan15° ≈ 1.0718 m.

FAQ

Beam angle definition?

Angle where intensity drops to half (or 1/10) of center, per standard.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Beam Diameter Calculator（/light/beam-diameter）。