There is a simple formula to help select the right screen size. The distance from the television to the viewer should be 1 ½ to 3 times the screen size. For example, if there is 12 feet (144 inches) between the back couch cushion to the wall, then the ideal screen size is between 144/1.5 to 144/3, or 96 to 48 inches.
While there's no perfect size for your home theater, bigger is better. For a fully immersive experience, 20ft long by 15ft wide is best, with high ceilings. However, smaller, typical family rooms around 10ft square are also fine for use with a large TV.
The 34-foot-wide screens are a little smaller than the standard cinema screen, which is about 45 to 65 feet wide and as tall as 30 feet. (IMAX screens are even bigger, at 72 feet wide and as high as 98 feet tall.)
For a 120-inch screen, you should sit 100.8 inches (or 8ft) away from your screen.
For a 16:9 screen and a 30 degree field of vision, simply take the distance you will sit from the screen in inches and multiply it by . 6723 to get the screen diagonal. In this example, if you are sitting 7 feet away from the screen the formula looks like this. Translate the 7 feet to inches, which gets you 84.
Home theater systems are definitely worth the time and money if you enjoy experiencing media in the best quality possible in your own home. You can spend as much time and money building a home theater as you want, but the more you put in the more you get out. Realistically, it'll be worth the investment.
An average medium size living room may be about the size of your room 20' x 15' x 8' or 2400 cu ft. A large room is anything bigger.
To find your optimum distance, measure the size of your screen diagonally and divide that size by . 84. Using that calculation, a 100-inch projector screen requires an optimal viewing distance of 119 inches or 3m from the screen.
Screen Size Dimensions
| Diaganol | 4:3 | |
|---|---|---|
| Inches | cm | H |
| 90" | 229cm | 54" |
| 100" | 254cm | 60" |
| 110" | 279cm | 66" |
150-inch Diagonal, 16:9 Aspect Ratio. View Size: 73.5" H x 130.7" W. Overall Size: 84.6" H x 138.6" W x 2.7" D.
Projection Distance
| Screen or image size (1) | Projection distance (2) Wide to Tele |
|---|---|
| 100 inches (254 cm) | 116 to 188 inches (295 to 478 cm) |
| 120 inches (304.8 cm) | 139 to 226 inches (354 to 575 cm) |
| 150 inches (381 cm) | 174 to 283 inches (443 to 719 cm) |
| 200 inches (508 cm) | 233 to 378 inches (591 to 959 cm) |
The screen size calculator can help you in determining the screen dimensions.
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To evaluate the screen's length, height, and area, we can follow the same equations as for a flat one:
Adjust the monitor height so that the top of the screen is at—or slightly below—eye level. Your eyes should look slightly downward when viewing the middle of the screen. Position the monitor at least 20 inches (51 cm) from your eyes—about an arm's length distance.
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