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ppi Calculator

PPI Calculator

This PPI calculator will helps to find Pixels Per Inch (PPI) and Dot Pitch or Dot Per Inch (DPI). The tool calculates PPI & DPI when pixels are entered in horizontal and vertical resolution, also the diagonal screen size.


Horizontal Regulation:


Vertical Resolution:

Diagonal Screen Size:





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An online PPI calculator help to finds the pixels per inch (PPI), dots per inch (DPI), and display size for any selected device. This dpi calculator enables to find a dot per inch (DPI) that is referred to as the number of printed dots contained within one inch of an image printed by a printer. You can try this free online pixel density calculator that measure the pixel density of an electronic image device that ranges from desktop PCs through to smartphones & image digitizing device. Also, this dpi and ppi resolution calculator is specifically programmed to tells how many pixels are displayed per inch of an image.

In this context, we are going to share the basic difference between PPI and DPI, the normal value for ppi, information related-resolution, how to calculate ppi step-by-step and calculator, and much more! First, let’s explore the basic definition of PPI (Pixels Per inch).

What is PPI (Pixel Per Inch)?

PPI pixels per inch and pixels per centimetre (ppcm or pixels/cm) are the terms used to define the resolution of screens such as mobile displays, computer monitors, television screens. It is used as a density measurement unit of displays which describes the sharpness of the screen. In simple words, its pixels per inch is the number of pixels in a square inch surface. The higher the value of PPI the more detail of the image you can see. But the human eye is made to see these details till a particular value after which the higher number doesn’t matter. While buying a television or mobile phone, it is important to know the pixel density as low pixels per inch will end up in bad image quality on display screens. Our ppi calculator is your best companion that helps to calculate PPI of a display within a couple of seconds.

What is the PPI formula?

If you want to calculate PPI, then you ought to divide the length of the diagonal in pixels by the length of the diagonal in inches. Additionally, you can use the PPI resolution calculator to get pixel per inch.

The PPI Formula is:

PPI = (diagonal in Pixels)/ (diagonal in Inches)

PPI = d_p / d_i

Our PPI calculator also uses the above formula while calculating PPI of a display.

Formula for diagonal length in pixel:

The formula to calculate the length of diagonal in pixel is as follows,

dp =√(width)2 + (Height)2


dp is the length of the diagonal in pixels.

What is DPI (Dot Per Inch)?

The definition of PPI and DPI are almost the same, DPI (Dots Per Inch) is the same as Pixel Per Inch (PPI) as they both determine the quality of the image. As from name, dpi measures the number of points in the 1inch of length.

The setting of the printer usually includes the Dot Per Inch (DPI) not Pixel Per Inch (PPI) because in a printer, DPI is the number of ink dots per inch. The DPI can be higher or lower Than the PPI of the image. It totally depends upon the printer’s characteristics.

So, if your concern is “what is my dpi”, then this online dpi calculator helps you to calculate dpi (Dot Per Inch) of your digital device.

What is The Diagonal Dot Pitch?

The diagonal dot pitch is the distance from the center of one pixel to the center of next diagonally. Dot pitch is calculated by dividing the diagonal length in inches to the diagonal length in pixels, then converted inches per pixel to millimeters per pixel. It is normally expressed in millimeters(mm) only.

What Is the Formula for the Dot Pitch?

The formula used for the dot pitch calculation is:

Dot Pitch = Diagonal in inches/Diagonal in pixel × 25.4/inch

What is Difference Between DPI and PPI (DPI Vs PPI)?

When it comes to DPI, it stands for Dot Per Inch. It is referred to as a physical characteristic of a printer – yes, every printer prints dots that when put next to each other comprise a photo, and each dot contains a physical size. DPI or dpi resolution is also said to be the maximum resolution that a printer is capable of. No doubt, low-end printers have lower DPI, and on the other hand, high-end printers have higher DPI. In simple words, it is the number of dots a printer can print per inch.

Pixel Per Inch or PPI definition is already described above, and afterward, you will also come to know about the functionality of our pixel per inch calculator. Now, compare both terms – you come to know that DPI is the term that stands for dot per inch, on the other end, PPI is also the same but with pixels instead of dots. Keep in mind; there are no such major differences between both terms since the pixel is considered as the dot of the screen. But, when we compare both at a deeper level, it might get complicated. You might be thinking that how to calculate the ppi & dpi of the screen, you can get the ease of resolution calculation with the help of this online screen resolution calculator.

Why There Is a Need to Know About PPI?

It is quite essential to calculate Pixels Per Inch (PPI) as it helps to choose the right computer monitor, phone, television, laptop, or camera. Once PPI calculated, you will get a better idea as to what the optimal screen resolution for these devices is. Apart from it, it is also useful to graphic designers that need to figure out the scale of an image or pixels to inches’ conversion.

Calculate pixel density is not an easy calculation as it involves diagonal display screen size, horizontal pixels, and vertical pixels. You can’t calculate ppi manually; you’ll need the help of our screen ppi calculator to get the idea of the best image quality product between many products.

About DPI and PPI Calculator:

An online free ppi calculator helps to find the resolution of a your device based on its dimension and the pixel count. This single tool helps you to perform calculations for both pixel per inch or dot per inch. You can try this dpi calculator that helps to find the resolution of an image both on screen and in print. This dpi resolution calculator is tells you how many dots fit into a linear inch. Remember that pixel density is not the same as resolution, where the manufacturer indicates the amount of a full detail on a physical surface or any digital device, while the latter resolution indicates the amount of total pixel information regardless of its scale.

How to use the pixel per inch calculator:

Don’t to worry; our pixel density calculator is fully loaded with a user-friendly interface. You just have to follow these steps to get ppi and dpi resolutions.

Read on!


  • First of all, you have to enter the screen width in (Pixels) in the field of ‘Horizontal regulation.’
  • Right after, you ought to enter the screen height in (Pixels) in the field of ‘Vertical Resolution.’
  • Very next, you have to enter diagonals screen size in (inches) in the field of ‘Diagonal Screen Size.’
  • After this, select your device from the dropdown of this pixel calculator either it is a computer, phone or a tablet.
  • Finally, hit the calculate button of this screen dpi calculator and get the Pixels Per Inches (PPI), Total Pixels, and Dot Pitch.


Once you fill all the fields of the PPI calculator, it will give you:

  • Pixel Per Inch (PPI).
  • Dot pitch.
  • Display size.
  • Total pixels of screen.
  • Pixel per square inch (PPI2)
  • Diagonal length.
  • Aspect ratio.

Does the (PPI) size matter?

A picture having a higher PPI or DPI has a better quality but there are some scenarios where higher PPI is harmful. If you have small screen as in the mobile phones or if you are looking on image from a distance, then there is a point on which you can’t see clearly and not clearly see the individual pixel and by increasing PPI, this effect becomes smaller and smaller. This totally depends on the distance of object at which you look and the size of object.

What is a normal PPI value?

Here we have a list of pixel per inch value standards, if you want to know about the PPI value standard.

  • Low density(LDPI) = 120 PPI
  • Medium density(MDPI) = 120-160 PPI
  • Medium High density(TVDPI) = 160-213 PPI
  • High density (HDPI or HiDPI) = 213-240 PPI
  • Extra High density(XHDPI) = 240-320 PPI
  • Extra Extra High density(XXHDPI) = 320-480 PPI
  • Extra Extra Extra High density(XXXHDPI) = 480-640 PPI

This online free ppi tester helps you to determine the pixel per inch (PPI) of the screen for which you can easily know in which standard your device has fallen.

What is The Aspect ratio of the Screen?

It is necessary to prepare an image shape for paper, because paper and image are in different shapes.

Aspect ratio is “the ratio of image to the long side to its short side”. It is a relationship between an image’s width and height and aspect ratio is written as the formula width to height like 4:7. The aspect ratio describes the image’s shape. The aspect ratio of square image is 1:1.

How to calculate ppi manually (Step-By-Step)?

At first, for the calculation of ppi you ought to calculate the number of pixels that appear on the diagonal using the given formula:

dp =√(width)2 + (Height)2


‘width’ represents the number of pixels that appears along the horizontal edge.

‘height’ represents the number of pixels that appear along the vertical edge.

The output of this calculation can be applied to the formula that we mentioned earlier.

That is:

PPI = d_p / d_i


‘di’ represents the diagonal screen size in inches.

Let’s try an example for manual calculation.

For example:

You have the screen resolution of 1800pixel horizontally and 900pixel vertically, and have 20inches diagonal screen size.

Calculate the PPI of your screen?


Step 1:

First of all, you have to determine the number of pixel on diagonal by the formula:

dp =√ (1800)2 + (900)2

dp =√3240000 + 810000

dp =√4050000

dp =2012.46

Step 2:

Now, use the PPI formula,

PPI = d_p / d_i

PPI = 2012.46 / 20

PPI = 100.62

You can try our PPI calculator to verify this problem.

Frequently Ask Questions (FAQ’s):

What is a good PPI?

The standard screen resolution of webpages is 72PPI.An images which spread 400 to 500 pixels have a good and look pretty big on a monitor.

Is 100 ppi good?

The print will be better and shape if the pixel per inch is more. The reasonable quality is 180ppi and 240ppi is the moderate quality. For the best quality image PPI should be of 300PPI.

What is the PPI of my image?

Once you have the print size and pixel count of your image,you can easily find the PPI of your page by dividing the diadonal in inches and diagonal in pixel.

What is a good PPI for a laptop?

According to wikipedia,a laptop having 220PPI is best for the reading on a screen.

How do I increase the PPI of an image?

To increase the PPI of an image,follow the given steps:

  • Click on image.
  • Click image size.
  • Check the “Resample” box.
  • Set resolution to 300PPI.
  • Then,click “OK”.

What is a good PPI for a smartphone?

The most important selling attribute of cellphones is the resolution.The highest resolution of smartphone is 440PPI and the average is 300pixel per inch.

How to Measure Monitor Size?

No doubt, it is critical to measure the monitor screen accurately to make sure the proper fit of your computer filter. So, to figure out the filter size, you have to measure diagonally from one corner to the opposite diagonal corner. Make sure that you only measure the viewable screen area; there is no need to include the dimensions of the screen’s frame or casing.Then enter the values in this monitor dpi calculator that calculates the monitor dpi which helps you to purchase the best dpi monitor.

Let’s Sum-Up:

Typically, PPI is considered to represent the pixel density measurment of digital screen of different devices. So, use this simple online pixel per inch calculator to determine the PPI,Dot pitch(DPI),total pixels of your desired display device.


From the source of Wikipedia: Pixel density, Basic Principles, Outputting to a Different Device, Printing on Paper, and much more about PPI.

From the authorized site of sony: What is the difference between Dots Per Inch (DPI) and Pixels Per Inch (PPI)?

From the source of digital-photography-school: Understand Pixels, Resolution, and Resize Your Images