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The pixel density calculator calculates the dots per inch instantly for your screen. It also provides dot pitch, size, aspect ratio, pixel count, and megapixels of your screen. It means you can convert dpi to pixels, calculate dpi resolution, and check resolution dpi for printing with one click.
How to use the DPI calculator?
To calculate DPI using this calculator, you need horizontal and vertical pixels in the item (screen, image, or poster) for which you want to calculate the DPI. You will also need the diagonal size of the screen. Measure all of these before you start calculating DPI.
 Enter the horizontal and vertical pixels in the respective input boxes.
 Enter the diagonal size in inches, millimeters, or centimeters.
 Click the "Calculate" button
It will instantly give you the dot pitch, DPI, size, aspect ratio, pixel count, and megapixels of your image or screen. You can choose advanced options to check if your device is listed by selecting your operating system. The DPI calculator will automatically pick the resolution and diagonal size of your screen.
The DPI calculator also referred to as the mouse DPI calculator, is used to calculate the dots in one inch of the display. The diagonal size can be entered in millimeters, centimeters, and inches. Using the overwatch DPI calculator, you can use the advanced options to choose an operating system as well as several make and models from various companies.
The advanced options for the operating system include Windows, iOS, Android, BlackBerry, OS X, Chrome, and SDI. There are multiple devices available to choose from when you select a specific operating system. Choosing from this advanced option will automatically update the resulting pan with the resolution and size of the screen.
What is DPI?
DPI stands for dots per inch. It is like PPI, each calculating the grainy dimension of an image. DPI would quantify the total points with an average length of 1 inch as the name implies.
In modern digital displays, the value is directly related to PPI, as each pixel represents one dot in the image, but not always a 1:1 correlation. When you are speaking of an ink printer, the defaults are usually DPI instead of PPI.
Since DPI means the amount of ink dots per inch in a printer, and that is regardless of the image resolution, which is to be printed. The dot per inch can be lower or higher than the pixel per inch of the image depending upon the characteristics of the printer.
How is DPI calculated?
Select an image on your computer for which you need to calculate the DPI. Or you can also calculate the dots per inch for a computer or laptop screen. If you have selected an image, go to its properties and check its resolution, or if you are about to calculate DPI for your computer screen, find out the resolution of your screen in the display options or graphic properties. Note down the resolution which you would have found in pixels because this resolution will be used to complete our calculation.
Next, you will need the height and width of your image or screen. Measure the height and width by using a ruler and note down.
Example:
Suppose we have an image with $1200 \times 1080$ resolution, 8 inches wide and 5 inches long.
Horizontal: $1200 \text{pixels}$
Vertical: $1080 \text{pixels}$
Width = $8 \text{inch}$
Height = $5 \text{inch}$
We will calculate horizontal and vertical DPI separately. Divide the horizontal pixels in your image by the width of the image and vertical pixels by the height of the image.
Horizontal Dots per Inch = $\dfrac{1200}{8} = 150$
Vertical Dots per Inch = $\dfrac{1080}{5} = 240$
DPI explained with an example
Suppose you have a printer that can print up to 300 dpi. You have an image of 1800 x 2800 with 5 MP. Suppose the page on which you want to print the image is seven inches in size. Remember that this size is measured diagonally.
The pixel density is 554.8 PPI, much greater than the pixel density of your printer. That printed ink dot can display more than one pixel of the image so that the printing process loses its resolution.
When you conceive of the same case and have a great 1000 dpi printer, the situation goes backward. There are now multiple ink dots in each pixel. A general recommendation is to limit the dot per inch on the printer to the multiple of the image's initial pixel density or to an integer fraction to prevent errors that occur when pixels are interpolated, and color values are estimated.
DPI Viewing Distance chart
This is the chart for the perfect viewing distance from a screen of an image with a minimum resolution to see it clearly.
Distance  Minimum Resolution 

0.6 m / 2ft  300 dpi 
1 m / 3.3ft  180 dpi 
1.5 m / 5 ft  120 dpi 
2 m / 6.5 ft  90 dpi 
3 m / 10 ft  60 dpi 
5 m / 16 ft  35 dpi 
10 m / 33 ft  18 dpi 
15 m / 50 ft  12 dpi 
50 m / 160 ft  4 dpi 
60 m / 200 ft  3 dpi 
200 m / 650 ft  1 dpi 
References:
Margaret Rouse. (2011) dots per inch (dpi). WhatIs.Com.
Pomerleau, PPI vs. DPI: what’s the difference? Source 99designs
Wikipedia  Dots per inch  Resolution explained

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