If you already know the size of your screen and the specific projector you will be using this tool allows you to determine the throw distance for your projector. The screen expert uses the projector's lens ratio and screen size to calculate your throw distance. If you don't know your projector's lens ratio don't worry because the screen expert has a large database of the latest projectors and their lens ratios.

The calculator also allows you to manually change your screen size so you can easily determine how large or small your screen can be given a fixed throw distance.