Simple Projector Lens Math

A common question we get from customers completing a self-install is “How far away should I mount my projector?”  While we are always happy to supply the answer, here is the math equation so you can figure out the proper throw distance yourself:

A lens (standard or long throw) will always show the minimum and maximum throw ratio; it looks something like “Throw Ratio = 1.5-3.4.” Once you know this, you can plug that into this distance formula:

Screen Width x Min Throw Ratio = Min Distance

Screen Width x Max Throw Ratio = Max Distance

So with the example TR above, lets assume you have a 12 ft wide screen. Accordingly:

12 x 1.5 = 18 ft (Min Distance)

12 x 3.4 = 40.8 ft (Max Distance)

Now, don’t you wish you had paid more attention in Mrs. Jones’ Algebra class?