What is PPI Pixels Per Inch, Display Resolution in smartphones


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Pixel per inch is the abbreviation of PPI and it is said to be a metric that is typically used to define pixel density of all types of display. It includes cameras, computers, mobile devices, etc. Important to understand what it actually means in the world of mobile technology. Visual computing and visual quality have increased over the past few years and pixel per inch has become a prime marketing tool.

It is important to know the pixel density because the low pixels per inch will display a bad quality on the display screen while buying any mobile device or television. For ease, give an account to PPI calculator that helps to determine the Pixel Per Inch of a display within a fraction of seconds.

What 20/20 vision really means?

Let’s first discuss how visual acuity is measured. We all must have heard about the 20 / 20 vision and it makes sense about perfect or maximum vision but that’s not true at all. This vision comes from the Snellen charts that were invented in the year 1860. This method was used to measure visual acuity for medical purposes. Well, calculating the pixels is important before purchasing any screen display device. Instead of performing the ppi calculations on the paper use the PPI calculator pixel per inch, dot per inch, and display size of any screen device.

Watching bad quality videos on mobile & television impacts the eye sight very badly but it can be overcome by wearing the glasses. So, it is beneficial to check the screen resolution before purchasing screen-based items. For ease use the online pixel density calculator that calculates the pixel density of an electronic image device that ranges from desktop PCs through to smartphone.

How to calculate ppi step-by-step?

Here we are going to show some simple steps to calculate pixel per inch:

  • At first you need to figure out the number of pixels that fit on the diagonal.

dₒ = √(w² + h²)

where, the “w” represents the number of pixels with the horizontal line and “h” represents the number of pixels along the vertical line.


  • Then, calculate the Pixel Per Inch by considering it as a ration between the number of with diagonal and diagonal screen size.

PPI = dₒ/dᵢ

Where dᵢ expresses the diagonal screen size in inches.

Manual calculation sometimes becomes daunting & critical because of the values but you can try a ppi resolution calculator to know how many pixels are displayed per inch of an image.


pixel is the acronym of the picture element and it is said to be the smallest assignable element of the display. This digital display is used to show the information about the colors and brightness. Actually, one pixel can contain three subpixels in red, blue, and green color. However, the pixel per inch calculation is not simple as it seems but with the assistance of an online PPI calculator can help you to calculate the number of pixels displayed on the screen.





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