In this formula, the 16 and 9 values are derived from the aspect ratio of modern televisions, which is 16:9. This formula is derived from the formula to calculate the hypotenuse of a triangle.

65″ TV screen width = 16 × 65 / √(16² + 9²) 65″ TV screen width = 16 × 65 / √(256 + 81) 65″ TV screen width = 16 × 65 / √337 65″ TV screen width = 16 × 65 / 18.36 65″ TV screen width = 16 × 3.54 65″ TV screen width = 56.7″

Thus, the screen width is equal to 16 times the diagonal measurement divided by the square root of 16 squared plus 9 squared.

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

If you don’t see your TV size in this list, then you can also use a screen size calculator to find the dimensions for your display.

The table below shows dimensions for common TV sizes, including diagonal, width, and height dimensions, in inches. This is useful for finding the dimensions of a 16:9 TV screen when you know the diagonal measurement.