How to calculate the size of computer screen?

The screen size is measured by the diagonal length of the screen, and the unit of measurement is inches.

Take a 5-inch screen as an example. A 5-inch screen is a screen with a diagonal of 5 inches. 1 inch = 2.54cm, 5 inches =12.7cm, so the diagonal is12.7cm. That is to say, all screens with diagonal of12.7cm are 5-inch screens.

Because the screen ratio is not fixed, the common ratio is 4:3, 16: 9, so the length, width and size are not fixed.

Extended data:

The size of LCD screen used in notebook computer is determined according to the market positioning of this machine. Most LCD screens below 14 inch are used. This part of the screen size includes:

8.9 inches, 1 1. 1 inch, 1.2 inch,12./inch, 13.3 inch, 13.4 inch.

And 14 "and 15" are the most common screen sizes for some models that pay attention to both performance and portability. At present, the mainstream built-in optical drive or optical soft interchange adopts 14. 1 "screen;

The most commonly used screen sizes of large notebook computers positioned as desktop substitutes are 15.4, 15.6 inches and 16 inches. Some machines even use 17 inches, and the largest is 18.4 inches.