Taken from PC World Magazine, July 2011 Edition

A 65-inch 3D TV looks great – if you can fit it into your living room.  Before you choose between LCD, LED and Plasma sets, you need to determine the size of the HDTV you want to buy.

To determine the right size for your room, get a tape measure and figure out how far away you plan to sit from your screen once you have it in place.  You can find several Web tools, including this table on Amazon’s site, that show how to translate that distance into the correct screen size.

Choosing the most appropriate HDTV size is not an exact science, however, and people have very different viewing preferences.  Keep Amazon’s tool in mind, but go to a local store and stand the same distance away from your desired set as you would be when you’re home.