65 tv viewing distance
How do you calculate the best seat-to-screen distance for a TV or projection screen? Divide the size of your screen by .84 (screen size is measured diagonally). For example, a 65-inch TV divided by .84 equals a 77-inch viewing distance (6.5 feet). For a 65-inch screen, the distance increases to 77 inches, or 6.4 feet. For an 80-inch screen, it's 95 inches, or 7.9 feet. You can do the math in reverse if you're trying to select a screen size for a predetermined viewing distance: Viewing Distance x 0.84 = Screen Size. By this formula, a 55-inch-diagonal screen has an ideal viewing distance of 65 inches, or 5.4 feet. For a 65-inch screen, the distance increases to 77 inches, or 6.4 feet. For an 80-inch screen, it's 95 inches, or 7.9 feet. This time you can divide your viewing distance by 3 to get the minimum screen size-and by 1.5 to get the maximum screen size. So, for example, if you know the viewing distance in your room will be about 10 feet (or 120 inches), you can work out that a good TV size will be in the range of: The SMPTE formula looks like this: Screen Diagonal (inches) / 0.6 = Viewing Distance (inches). For a 65-inch screen, the SMPTE-recommended distance would be 108 inches, or nine feet. Using this data, the closest you can sit to your television while still maintaining the maximum perceived angular resolution is about 1.6 times the diagonal measurement of your television. For example, a 55 television will have an ideal viewing distance of 88 (55 x 1.6), or 7 feet and 4 inches. To determine the best seat-to-screen distance in your room, THX recommends dividing the diagonal screen by .84. For example, a plasma or LCD TV with a 65-inch screen divided by .84 equals a 77-inch viewing distance (6.5 feet). For boring old 1080p, there are two major industry standards that dictate where you should sit – SMPTE and THX. THX’s standard is very simple: divide your screen size (measured diagonally) by .84, and that’s how far you should sit from your TV. A 65-inch TV divided by .84 equals a 77-inch viewing distance (6.5 feet). Here's a formula that makes it really simple: Viewing distance (in inches) divided by 3 = recommended TV size. For example, if you're usually sitting 10 feet from the TV, that's 120 inches (10 feet x 12 inches). A 65-inch TV divided by .84 equals a 77-inch viewing distance (6.5 feet). SMPTE’s standard is actually not a home theater standard at all – it’s a movie theater standard that’s just been widely adopted by home theaters.
6.4 feet