As a generall rule for standard screen(4x3aspect ratio) take the viewing distance divide by 3.5 then multiply by 12.For HD take the viewing distance divide by 1.5 then multiply by 12.These are only guidelines and you could always go slightly larger.
Distance/Screen SIze Formula?
My husband and I are debating between a 50" and a 60" flat panel television for our living room. Although the room is very long , it is not very wide and we would be veiwing the televsion from aprox.12 feet from the screen. Does 60" seem like too large a screen for that distance or can we go for it?We hate the feeling of sitting in the first few rows of a movie theatre.........hence our concern. Can anyone help?