Loading workspace
Lighting · Calculator
Estimate nominal beam diameter and pool area from throw and lens angle.
Working calculator
Enter the known values. ShowSide validates them before running the calculation.
Saved on this device
Keep repeatable inputs on this device or create a link that another technician can open.
No presets saved for this tool yet.
The link contains input values only—not saved results or account data.
Favorites, recent tools, and presets stay in this browser on this device. Clearing site data removes them; account sync is not active yet.
Result
Enter throw distance and the fixture's nominal lens angle.
Transparent math
Photometric and beam geometry estimates do not establish safe hanging, focus, heat clearance, fall protection, power, or audience exposure. Follow qualified lighting and rigging practice.