First, look for information about screen size and distance, which is typically expressed as screen size @ distance from screen within the specification of most projector models. For example, the specification 100-inch @ 2.5m means that the minimum distance required between the projector and the screen is 2.5 meters to project a 100-inch screen. Because a 100-inch image with a 16:9 aspect ratio has a width of approximately 2.2 meters, this means that a space of about 6.6 square meters to 9.9 square meters, about the size of a small bedroom, is needed to project a 100-inch picture in this example.