Beam angle to Coverage Light Converter

The Beam Calculator at Stage Lighting Store converts between three core values—beam width (coverage diameter), throw distance, and lens degree—to help lighting designers determine how a fixture will spread light at a given distance. By entering any two values, the tool computes the third, supporting both feet and meters as long as units are consistent. The result provides an estimated circle of light size, allowing users to quickly visualize fixture spread for theater and event setups without manual trigonometry. The site’s version distinguishes itself through its tight integration with product offerings and a straightforward, no-frills interface. While other calculators exist, this one allows unit selection and directly references lighting fixtures available for purchase on the same domain, creating a practical workflow from design to procurement. The interface presents three input fields and a single calculate button, with clear labels for ‘How wide will the light circle be?’, ‘How far away will the light be?’, and ‘What degree is the lens?’, avoiding unnecessary options or graphs.