Viewing angle: Based on the inputs, this is the viewing angle or arc for your set up. Pictures on these TVs can have four times the detail of a Full HD set, but you really need to go 40-inch or larger to appreciate the jump in picture quality. The average FOV width for the human eye is 140 degrees. So for a 50-inch screen the optimum viewing distance would be 125 inches or about 10 feet (3.18m). For example, for a 1080p monitor with a 16:9 aspect ratio, the international standards body SMPTE suggests calculating your distance from the display and divide it by 1.6 to find out the size of the largest monitor you can use.. I'll be honest, I don't subscribe to any of the established "rules" for viewing distance and screen size. This corresponds to the point at which most people will begin having trouble picking out details and reading the screen. To find the optimal size 4K UHD TV display, we suggest a 1 to 1 ratio between viewing distance and screen size. Notes: The audience should sit at least this distance from the screen.This is the Shortest Recommended Viewing Distance based on Field-of-View being too wide: This distance is calculated on the peripheral vision field of view of the human eye. However multiplying by a factor of 2.5 is more related to the optimum viewing distances recommended for a standard definition TVs and since high definition TVs have much higher resolution, you can in fact sit much closer. Recommended screen sizes and seating distance. Several formulas have been developed over time for determining the ideal viewing distance from seat to screen. From the same 8 feet viewing distance, theoretically your screen could max out at 125 inches. The suggested viewing distances in the tool above are based on high-definition televisions, but many now come with 4K ultra HD screens, meaning you can sit that little bit closer. -Maximum recommended viewing distance: Based on data from Electrohome, which suggests a viewing distance of three to six screen widths for video. For maximum recommended screen size for 4K Ultra HDTVs, multiply the viewing distance by 15.6. This corresponds to the point at which most people will begin having trouble picking out details and reading the screen. How close should you sit to a 4K TV? If you sit 1.5m (4.5ft) from your screen, you should have the best experience with a Full HD screen of about 32in, and a 4K Ultra HD screen of around 42in. Maximum recommended viewing distance: Suggests a viewing distance of three to six screen widths for video. A screen size that big overwhelms most people.