The BenQ Throw Ratio Calculator allows users to calculate the throw ratio vs. projector position in the room. You enter parameters such as aspect ratio, installation type, and units of measure. The online app displays results such as ‘distance from the floor,’ and ‘distance to the screen.’ A dropdown menu presents specific BenQ products, but this could also be a handy tool for quick reference comparisons of various options. This allows experimentation with various mounting and lens choices to determine the best option for specific products or which product best fits specific room and projection requirements and restrictions. No login required.
http://www.benq.com/microsite/projector/throwratiocalculator/
