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Screen DPI Calculator

Find a screen's pixel density (PPI) from its resolution and diagonal size.

Inputs

Width (px)
Height (px)
Diagonal Size (inches)

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Saved Scenarios

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Inputs updated · Results recalculated · Just now

PPI (Pixels per Inch)

91.8

Spark says

How it's calculated
A professional video editing workspace featuring monitors, keyboard, and microphones in a studio setting.
Photo by Amar Preciado on Pexels
Close-up of a video editing timeline on a computer screen, showcasing modern technology.
Photo by Vito Goričan on Pexels

Formula

PPI=Widthpx2+Heightpx2DiagonalinchesPPI = \dfrac{\sqrt{Width_{px}^2 + Height_{px}^2}}{Diagonal_{inches}}
Width_{px}, Height_{px}
— Screen resolution
Diagonal_{inches}
— Physical screen diagonal

What is the Screen DPI Calculator?

Pixel density (PPI/DPI) measures how many pixels are packed into each inch of physical screen — higher values mean sharper, more detailed images.

How to use it

  1. 1 Enter the screen's resolution (width and height in pixels).
  2. 2 Enter the physical diagonal size in inches.

Worked examples

1920×1080 on a 24-inch screen

About 91.8 PPI.

Try it

Frequently asked questions

What PPI counts as 'Retina' or high-density?

Apple's Retina displays are typically around 220+ PPI for laptops and 300+ for phones — though the perceived sharpness threshold depends on viewing distance too.

calixo.cloud/developer/dpi-calculator/ — free calculator, no signup required.