If you ask TV and theatrical industry groups, they'll tell you to measure your seating distance to determine the ideal screen size. The farther away you sit, obviously, the smaller your TV appears.

TV Screen Size Calculator helps visualize ... Simply measure your viewing distance using a tape measure from your seating area to where the TV will be located. Enter this distance into the Inch ...

I want to buy a new TV and need some advice on how big it should be and how high up the wall I should place it. The TV is for our main living area and will go opposite the sofa on the wall.