![]() ![]() The most common one is to calculate it from the diagonal screen size (in inches or cm) and the number of pixels along the vertical and horizontal edges of the display.įirst, you need to calculate the number of pixels that fit on the diagonal: Now that we've established what is PPI and reviewed the PPI definition, let's see how you can calculate PPI. ![]() For purely virtual images, we have a calculator/converter that allows you to convert between different virtual sizes: the px to em calculator. However, when we're talking about a digital image in a computer, PPI cannot be computed since the digital image varies in size depending on the level of zoom, the size of the screen, etc. For example, a screen or a printed picture has a fixed physical size, so it makes sense to calculate how many pixels per inch there are in such an object. It is important to note that for calculating PPI we need something that has a physical size, not a virtual file. Also worth mentioning is the fact that our pixel density calculator assumes square pixels. There are other measurements of pixels density, such as pixel per square inch, that involve calculating the area of a rectangle that is the screen. This measurement is based on the fact that screens and images, despite being 2D, have generally the same density along any of the two main axes. The density is measured as the number of pixels that fit on a 1-inch line, hence the name. The technical PPI definition is pixels per inch, and it represents a measurement of the pixel density of a screen or a digital image. PPI is a widely used acronym in tech forums on the Internet, especially those focused on display technology and smartphones. ![]()
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