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# How is the screen size of a mobile phone measured?

When we talk about screens of any kind, the first information we look for is their size, usually measured in inches. But do you really know how this measurement is made?

First of all, you need to know what an inch. It is a unit of measure of distance from the imperial system, little used in the world outside the United States, but extremely recurrent. One inch equivalent to 2.54 centimeters in the international unit system.

From this, it is necessary to know how the measurement is made. What few people know when we talk about screen, the number of inches displayed refers to its diagonal. The value in the referent is neither panel width nor height. You can take the test at your own home. If you do not have a ruler that measures inches, simply measure the top right edge of the bottom left panel and divide the number by 2.54.

Or, if you prefer, you can dig up the Pitgoras theorem that you must have learned in elementary school. Remember the sum of the square of the collars that equals the square of the hypotenuse? Just remember the formula "height + width = diagonal". To calculate by measuring the height and width of the screen, square both numbers and add them together. Then just make the square root of the value found and you get your screen diagonal. If you used values ??in centimeters, you still need to convert the value in inches by dividing it by 2.54.

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