Easy Projector Throw and Screen Size Calculator - YouTube
6 Best Free Projector Calculator Software for Windows
Projector Calculator
Something a little different. An Overhead Projector calculator. By Stokes Publishing Company but built to emulate the FX-300W and a couple of similar models. : r/calculators
Optoma UHD38 Projection Calculator - Throw Distance and Screen Size
Projctor Throw Distance Not Working Out | AVS Forum