From Engadget · Dave Meikleham · · 1m 40s
The 30-degree rule for TVs
Engineers have a formula for the perfect viewing distance based on your screen size.
In brief
Engineers have a formula for the perfect viewing distance based on your screen size. Sit about 1.6 times your TV's diagonal size away for comfortable viewing without eye strain. Originally reported by Engadget.
The 30-degree rule explained
The Society of Motion Picture and Television Engineers recommends sitting where your TV fills a 30-degree field of view. That's roughly 1.6 times the diagonal size of your screen.
Distance for common TV sizes
A 55-inch TV calls for 7 feet 4 inches away, a 75-inch needs 10 feet, and an 85-inch requires about 11 feet 4 inches of distance.
The 40-degree rule for cinema
Want a more immersive experience? Sit at 1.2 times your TV's diagonal size away, where the screen fills 40 degrees of your view. This works well for gaming too.
The extreme 62-degree rule
Sitting just 5.9 feet from an 85-inch TV follows the 62-degree rule, but this extreme distance can strain your eyes and neck significantly.
65-inch TV distances
For the popular 65-inch size, sit 8.7 feet away for the 30-degree rule, 6.5 feet for 40-degree, or just 4.6 feet for the extreme 62-degree rule.
Real life rarely matches the math
Most people don't measure their living rooms or rearrange furniture for viewing angles. Room layout and existing furniture placement usually determine actual viewing distance.
Eye strain from sitting too close
Viewing from too close causes your eyes to work harder, leading to dryness, fatigue, blurred vision, and headaches as your pupils constantly shift to track action.
Picture quality suffers up close
Compressed video artifacts become visible when you sit too close, and certain TVs like VA LCDs show backlight bleed and uniformity issues at close viewing angles.
The one thing
Sit about 1.6 times your TV's diagonal size away for comfortable viewing without eye strain.
