To determine the optimal display there are various factors taken into consideration such as the viewing distance, resolution, and human visual acuity. There’s a specific formula that is used to calculate optimal display. You can use a diagonal screen size calculator to calculate the diagonal. 

As per Avixa standard – Display Image Size for 2D Content (DISCAS), the Diagonal Size (D) of the display is calculated using:

D = sqrt(W^2 + H^2)

W = AR * Image Height

H = L/Discas Constant * Image Height

In this formula

D: Diagonal Size of Display

W: Width of Display

H: Height of Display

AR: Aspect Ratio

L: Distance of last viewing person

Yes, you can head to the XTEN-AV online screen size calculator that will guide you to select the best screen according to your inputs. However, you can also check out the same for multiple screens such as screens on the side and front walls.

If you are seated more than six feet from the TV in crowded rooms, choose at least a 40-inch screen. A 50-inch screen works well for a distance of up to 7.5 feet. If you are 9 feet away, consider a 60-inch screen as the minimum size.