Online Smartphone Projector Calculator | How do you build a Smartphone Projector? - physicsCalculatorPro.com
Optoma launches new interactive throw distance calculator | Optoma United Kingdom
Scientific Calculator with Projector Model | Ward's Science
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 HD39HDR Projection Calculator - Throw Distance and Screen Size
Throw Distance Calculator
6 Best Free Projector Calculator Software for Windows
Projection Calculator Pro - Projector to Screen Distance