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Stage Lighting Store
stagelightingstore.com
Its free Beam Calculator lets you enter any two values among beam width (coverage), throw distance, and lens degree t...

Best Free Beam angle to Coverage Light Converter Tools — Number Convert Review | The Free Tools Directory

Their Lighting Beam Angle & Spread Calculator is free and supports direct conversion between beam angle, throw distan...

This free Beam Spread Calculator computes light coverage from beam angle and distance, and can solve for missing vari...

This free Beam Angle Calculator converts beam angle and mounting height into beam spread (coverage diameter). It also...

The page includes a free Field Angle Calculator that converts between field angle, beam width (coverage), and distanc...