Pixel density calculator


What is pixel density

Pixels per inch (PPI) is a measurement of the pixel density (resolution) of devices in various contexts: typically computer displays, image scanners, and digital camera image sensors. The PPI of a computer display is related to the size of the display in inches and the total number of pixels in the horizontal and vertical directions. Check out pixel density on Wikipedia


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More on pixel density

If you want to calculate pixel density of your screen, you will have to know: horizontal and vertical pixel counts and your diagonal screen size. Then apply this formula, or use our calculator;)


pixel density formula
\( d_p = \sqrt{w^2 + h^2} \)
\( PPI = \dfrac{d_p}{d_i} \ \ \) where

\( w \) is width resolution in pixels
\( h \) is height resolution in pixels
\( d_p \) is diagonal resolution in pixels
\( d_i \) is diagonal size in inches (this is the number advertised as the size of the display)


If you want to know even more, check out this awesome Linus Tips video below.



Historical improvement of PPI (list of devices)


Mobile phones

Device name Pixel density (PPI) Display resolution Display size (inches) Year introduced Link
Motorola Razr V3 128 176 x 220 2.2 2004
iPhone (first gen.) 128 320 x 480 3.5 2007
iPhone 4 326 960 x 640 3.5 2010
Samsung Galaxy S4 441 1080 x 1920 5 2013
HTC One 486 1080 x 1920 4.7 2013
LG G3 534 1140 x 2560 5.5 2014

Tablets

Device name Pixel density (PPI) Display resolution Display size (inches) Year introduced Link
iPad (first gen.) 132 1024 x 768 9.7 2010
iPad Air (also 3rd & 4th gen.) 264 2048 x 1536 9.7 2012
Samsung Galaxy Tab S 288 2560 x 1600 10.5 2014
iPad mini 2 326 2048 x 1536 7.9 2013
Samsung Galaxy Tab S 8.4 359 1600 x 2560 8.4 2014

Computer displays

Device name Pixel density (PPI) Display resolution Display size (inches) Year introduced Link
Commodore 1936 ARL 91 1024 x 768 14 1990
Dell E773C 96 1280 x 1024 17 1999
Dell U2412M 94 1920 x 1200 24 2011
Asus VE228DE 100 1920 x 1080 27 2011
Apple Thunderbolt Display 108 2560 x 1440 27 2011
Dell UP2414Q UltraSharp 4K 183 3840 x 2160 24 2014