Beam angle to Coverage Light Converter
This free Beam Spread Calculator computes light coverage from beam angle and distance, and can solve for missing vari...
What Beam angle to Coverage Light Converter does
The Beam Spread Calculator on Calculator Academy converts a lighting fixture's beam angle and mounting distance into an estimated coverage diameter and illuminance. Users input two of the three primary variables—distance to surface, beam angle, or beam spread—to instantly solve for the missing value. The interface supports both imperial and metric units, offers preset distances (from 3 m to 12 ft) and preset beam angles (10° through 90°), and includes a separate illuminance calculator that factors in luminous flux. Results display coverage diameter and estimated light levels, providing a practical snapshot for lighting layout planning.
How to use the Calculator Academy Beam angle to Coverage Light Converter
- 1
Select the known variable (distance, beam angle, or beam spread) and input its value using the appropriate unit selector
- 2
Choose a preset distance or enter a custom distance to the target surface
- 3
Pick a preset beam angle or manually enter the angle in degrees or radians
- 4
View the calculated beam spread diameter and, if luminous flux is provided, the estimated illuminance at the target
Best for
Lighting designers, installers, and DIYers who need a quick, unit‑flexible estimate of how far a fixture’s beam will reach and how much area it will cover at a given height.
Limitations
- Coverage diameter is an estimate based on simple trigonometry and does not account for fixture optics or surface reflectivity
- Illuminance calculations require an additional luminous flux input and are approximate
- No option to save or export results directly from the page
Beam angle to Coverage Light Converter FAQ
- Can I calculate beam spread if I only know the beam angle and mounting height?
- 1-3 sentence answer grounded in the material
- Does the tool support metric units for distance and beam spread?
- 1-3 sentence answer grounded in the material
- How is illuminance estimated in this calculator?
- 1-3 sentence answer grounded in the material
- What preset options are available for quick calculations?
- 1-3 sentence answer grounded in the material
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