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You have a computer screen that is 1920 pixels wide by 1080 pixels high. The diagonal is 10 inches. You want to find the pixel density in one linear inch of display.

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The number of pixels per inch or PPI tells you how many pixels are in a 1 inch line on a display screen. The PPI will be the same whether it's a horizontal or vertical or diagonal inch because pixels are square and therefore symmetric. If a display does not have square pixels then this calculator does not apply.

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The PPI Calculator finds pixels per inch (PPI) and pixels per centimeter (PPcm). It will calculate PPI when inches are entered and calculate both PPI and PPcm when centimeters are entered.

PPI is a measure of pixel density or resolution of a computer screen, television screen or other display device. Pixels per inch or PPcm indicates how many pixels are in a 1 inch line or 1 cm line on a display. Also calculated are dot pitch, diagonal in pixels and total number in megapixels.

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In some cases we want to know the aspect ratio in terms of 1 as the second term. In that case, divide both terms by the second term to get 1920/1080 = 1.7 and 1080/1080 = 1. The aspect ratio in terms of 1 is 1.7:1 and we can say 1920:1080 = 16:9 = 1.7:1

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Furey, Edward "Pixels Per Inch PPI Calculator" at https://www.calculatorsoup.com/calculators/technology/ppi-calculator.php from CalculatorSoup, https://www.calculatorsoup.com - Online Calculators

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For example, let's say you have a screen width equal to 1920 pixels and height equal to 1080 pixels. The ratio of width to height is 1920:1080. To reduce this to lowest terms we find the greatest common factor of 1920 and 1080 which is GCF(1920,1080) = 120. Reduce our ratio of 1920:1080 by dividing both terms by the GCF of 120. 1920/120 = 16 and 1080/120 = 9 so our reduced ratio is 1920:1080 = 16:9. 16:9 is the aspect ratio, the ratio of width to height in lowest terms.

Multiply PPI × PPI to get pixels per square inch. The number of pixels in a square inch represents the resolution or pixel density of an area of one square inch. Substitute 1 cm for 1 inch to find pixels per square centimeter or PPcm2.

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You can use the same PPI formula above to calculate pixels per centimeter, PPcm. Just substitute cm for inches to find PPcm.

Diagonal dot pitch is the diagonal distance from the center of one pixel to the center of the next. Dot pitch is calculated from the diagonal length in inches and pixels then converted from inches per pixel to millimeters per pixel but normally only expressed in millimeters (mm).