The ideal height for TV mounting depends mainly on four factors: the size of the TV, how far away you'll be, your eye level height, and the viewing angle. As a rule, the center of a 42” TV should be mounted about 56 inches from the floor, a 55” TV around 61 inches, a 65” TV around 65 inches, and a 70” TV around 67 inches. But the exact mounting height will vary depending on your eye level, which will vary depending on the height of your seats, couch, or bed. Per the Society of Motion Picture and Television Engineers, you’ll want the TV to be mounted for a viewing angle of not more than 30 degrees. Most people casually sit between 10 to 15 degrees reclined.