SMPTE's 30-Degree Rule Offers TV Viewing Distance Guidance

For a 55-inch screen, the 30-degree rule suggests sitting about 7 feet 4 inches away, according to Engadget. A 75-inch TV calls for roughly 10 feet, and an 85-inch set calls for about 11 feet 4 inches.

SMPTE also describes a 40-degree rule for a more cinematic or immersive experience. That angle places the viewer about 1.2 times the screen's diagonal size from the TV. Engadget reported this may suit viewers who play PS5 games and regularly struggle to read small in-game text.

A third option, the 62-degree rule, places the viewer much closer. Engadget noted that an 85-inch TV would call for a distance of just 5.9 feet under that guideline, while a 65-inch screen would require about 4.6 feet. By comparison, the 30-degree rule puts a 65-inch TV at about 8.7 feet, and the 40-degree rule puts it at about 6.5 feet. Engadget reported that 65 inches is now the most popular screen size for modern TVs in the US based on sales figures.

The guidance is not an exact science. Engadget said room dimensions and layout play a major role in how close or far a viewer sits. One Engadget writer said they sit about 11.2 feet from a 77-inch OLED mainly because that is as far back as their La-Z-Boy reclines before it bumps into a breakfast bar.

Sitting too close can cause eye strain as the eyes shift back and forth to follow on-screen action, according to Engadget. That can lead to dry, fatigued eyes and, in more severe cases, blurred vision or headaches. Picture quality can also suffer: heavily compressed YouTube videos, even 4K ones, make video artifacts easy to spot from too close. With VA LCD TVs, which have narrow viewing angles, sitting outside the ideal angle can highlight issues such as backlight bleed.