Projector Size Calculator
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Formula
Screen Width = Distance / Throw Ratio. For 16:9: Height = Width / 1.778. Diagonal = sqrt(Width^2 + Height^2). Throw Ratio = Distance / Screen Width.
Frequently Asked Questions
What is throw ratio?
Throw ratio is the distance from the projector to the screen divided by the screen width. A throw ratio of 1.5 means the projector needs to be 1.5 feet away for every 1 foot of screen width. Most home projectors have a throw ratio of 1.5-2.0.
How far should a projector be from the screen?
It depends on the desired screen size and your projector's throw ratio. For a 100-inch diagonal (16:9) screen, which is about 87 inches wide, a projector with 1.5 throw ratio needs about 10.9 feet of distance.