Toolvist

DPI Checker

Work out your screen's pixel density in DPI and PPI from its diagonal size, and see what that means for print sizing. Free online DPI and PPI checker.

Measure corner to corner, bezel excluded.

Common sizes

Pixel density

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Dot pitch

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Physical width

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Physical height

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1 CSS pixel

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Screen resolution

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Device pixel ratio

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Total pixels

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Density class

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Print equivalents (image pixels needed for a full-screen print)

Print DPI Pixels needed Print size from your screen resolution Quality

DPI Checker

Work out the pixel density of your screen. Enter your monitor's diagonal size and the calculator uses the reported resolution to give you pixels per inch, dot pitch, the physical dimensions of the display and what that means for printing.

How to Use

The screen resolution and pixel ratio are read from your browser automatically. You just need to supply the diagonal measurement, which is the figure on the box or in the spec sheet — 24 inches, 27 inches, and so on. Every other figure is then derived.

  • Pixels per inch (PPI) and DPI
  • Dot pitch in millimetres
  • Physical screen width and height
  • What one CSS pixel measures on screen
  • Print size at 150, 300 and 600 DPI

PPI, DPI and why the number matters

Strictly speaking PPI counts pixels per inch on a display and DPI counts ink dots per inch on a printer, but the terms are used interchangeably for screen density. A higher density means sharper text and images, because each pixel is physically smaller. This is why a 27-inch 4K monitor looks crisper than a 27-inch 1080p one even though the physical size is identical.

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