Advice 1: How to convert centimeters to pixels

The pixel size on the screen and the number of pixels in a square centimeter always different depending on the matrix screen. There is a special amount of pixels per inch (ppi). It is possible to calculate the number of pixels per mm and cm and Vice versa, how many in a particular distance of pixel.
How to convert centimeters to pixels
Instruction
1
Pixel is not a metric or a static value. It is a relative unit. Therefore, to calculate the number of pixels per centimeter it is necessary to know this parameter as ppi. It should be noted that the human eye does not distinguish between ppi equal to 306 and more. It's so small pixels that the eyeball may not recognize individual point and take the picture as a whole. To date, the ppi setting is used when printing glossy magazines, as well as in the Apple iPhone 4.
For measuring the amount of pixels per inch on any screen, you can use a special table of “Pixel Size”, located at http://lcdtech.no-ip.info/data/pixel.size.htm.
2
In the table you will see screen size, resolution, format, number of pixels per inch (ppi) and the pixel size in millimeters.
For example, based on the table, a screen with a diagonal of 21 inches and a resolution of 1680x1050 pixels, offers 94.3 pixels per 1 inch, and the pixel size of this matrix is equal to 0.27 mm.
So, in (1 cm=10 mm) of such a matrix (length) contains 37.037 pixel (10 mm / 0.27 mm = 37.037). In a square centimeter of the matrix of this resolution and the diagonal will contain approximately 1371.742 pixel (x 37.037 37.037 = 1371.742).
3
You can also use a specialized calculator, if the table is not given the required matrix. You enter in the calculator at the top of the page is the screen resolution and diagonal, using point as separator of the integer and its parts, and then click "Calculate". The screen will display parameters such as the visible area of the screen, the aspect ratio and the desired parameters – pixel size in millimeters and the specific resolution.
Next, divide 10 mm (1 cm) to the length of the pixel to convert centimeters to pixels. If necessary, multiply the result by the number of inches.

Advice 2: How to convert inches to centimeters

In some cases there is a need to translate the inches to centimeters. This may be necessary in life, when choosing a computer or TV with an optimal screen size. Learn how to quickly and accurately translate inches to centimeters.
How to convert inches to centimeters
More recently, the size of the items along with millimeters and centimeters was taken to represent inches and feet. Today with inch designations also have to face quite often. For example, usually indicated in inches screen size in the specifications of the technical devices. This can be a TV, laptop, tablet or smartphone. And though most of us roughly imagine what is the difference between monitors 5 and 14 inches, in some cases it is necessary to know exactly how inches are converted to centimeters.

How many centimeters fit in one inch?



In the old days, smaller items were made to measure the finger, so in Britain he caught a measure of one inch, which is approximately equal to the width of the thumb of an adult male.

Since 1958, the English and American inch is officially equated to the value in 2.54 cm Therefore, in order to know how many centimeters accommodates a specified number of inches, you will need to make a simple calculation – multiply the size in inches by the factor 2.54.

A little harder to translate to centimeters, the specific parameters shown in inches. For example, the inch thread, the diameter of plumbing pipes, the size of the keys. In this case, you will need to use a calculator, or memorize the most popular values. Usually the manufacturer specifies the pipe diameter in: 3/4, 5/16 or 1/4 inch. To find out how you can check the size in centimeters, you need the 2.54 value multiplied by the specified amount.

However, it is worth noting that the traditional designation of pipe diameter in inches almost always does not match the recalculated value, in centimeters. Therefore, for accurate determination of the real diameter of the pipes in metric units, it is best to use a reference table.

Measuring devices



It is most convenient to translate the inches to centimeters using a variety of measuring devices. Today, there are rulers, measuring tape and tape measure that show the size of the object, in inches and in centimeters. On the one hand, this line indicates the centimeters and millimeters, and with another – inches, and feet. By means of such a measuring tool to accurately determine what is equal to the length or width of the object in the desired units.

Today the International society of Metrology advises manufacturers and large enterprises use metric designations instead of the inch in all cases when possible.
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