PPI Calculator
Pixel density from resolution and screen size.
Pixel density
109 PPI
pixels visible up close
PPI is a property of a display or an image at a stated size; DPI is a property of a printer. A 27-inch monitor at this resolution shows roughly 109 pixels per inch, which is why the same design looks different on a phone.
How the PPI Calculator works
PPI is a property of a display or of an image at a stated size. The same design looks different on a phone and a monitor because the pixel density differs by a factor of two or more, not because anything about the file changed.
Also known as: pixels per inch calculator · screen pixel density · PPI vs DPI calculator
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Frequently asked questions
How is PPI calculated?
The diagonal in pixels, found from width and height by Pythagoras, divided by the diagonal in inches.
What PPI counts as high density?
Above roughly 200 PPI, individual pixels become hard to distinguish at normal viewing distance. Phones commonly exceed 400; desktop monitors often sit near 110.
Does PPI matter for web design?
Indirectly. Browsers work in CSS pixels rather than device pixels, and high-density displays render multiple device pixels per CSS pixel, which is why images need to be supplied at 2× for them to look sharp.
Is PPI the same as resolution?
No. Resolution is the total pixel count; PPI is how densely those pixels are packed. A 4K phone and a 4K television have the same resolution and vastly different PPI.