TVs range in size from 5 inches up to 64 inches and greater. TVs are measured by their screen size. This measurement is made diagonally across the viewing area. You can use this measurement to help you decide which size is right for the space you'll be using.
Start by mentally placing the TV in the room. Most TVs get deeper and heavier as the screen gets larger. Make considerations for height, width and depth when placing it in the room. Make sure your location is reasonably close to a good power source.
Once you've placed the TV, measure the distance from your couch or viewing area. There is a formula to calculate the optimum screen size based on the viewing distance. Different TV sources alter the equation. The formula is simple:
Of course, very few of us watch only one kind of TV. Use the chart above as a guide to find an average distance and screen size that is appropriate for your needs.
If you already have an entertainment center or armoire that you don't plan to replace, then you will be limited to the TV size it can hold. Remember, when fitting a TV into a piece of furniture, you need to consider depth and weight in addition to height and width. You should also factor in a couple of inches into your measurement to allow for proper ventilation for the new set.
Generally speaking, 27 inches or less is good for a bedroom or secondary television. Thirty-two inches and larger is a nice size for a family television or entertainment center.