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 @ 8ft means that the minimum distance required between the projector and the screen is 8ft to project a 100-inch screen. Because a 100-inch image with a 16:9 aspect ratio has a width of approximately 7ft, this means that a space of about 21 square ft to 32 square ft, about the size of a small bedroom, is needed to project a 100-inch picture in this example.
To select the ideal projector for your home, you only need to measure the length and width of the room, and use the maximum distance the projector can be placed from the screen to filter for the specific projector model that will meet your ideal screen size from that distance. If the space has an irregular shape, such as an L shape or a polygon, first confirm furniture placement, then measure the distance between the two walls as the reference for purchasing a projector. Keep in mind the best setup position is where two walls are furthest apart in the space.