The viewable rectangular screen size dimensions for an exactly 100″ diagonal television would be about 87.2″ wide and 49″ high. Actual 100″ TV screen dimensions may vary slightly by a fraction of an inch more or less, as TV screen size classes are rounded to the nearest whole inch. Also, the bezel adds a bit more width and height to the television’s overall dimensions, and two supporting legs/feet or a pedestal stand add some more height and depth if you don’t wall mount the TV.