# 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.

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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;)

$$d_p = \sqrt{w^2 + h^2}$$ $$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