PPI (Pixels Per Inch) measures how many pixels fit in one inch of screen. Higher PPI means sharper images. Screens above ~200 PPI are often called 'Retina' quality.

How do I calculate PPI?

Enter your screen's diagonal size in inches and its pixel resolution (width × height). The calculator uses the Pythagorean theorem on the pixel count and divides by the diagonal size.

What DPI should I use for printing?

300 DPI is the standard for high-quality print. 150 DPI is acceptable for large-format prints viewed from a distance. Use the print calculator to find the pixel dimensions needed.

Can I compare two screens?

Yes. Enter specs for two devices and click 'Compare' to see their PPI, resolution, and megapixels side by side.

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Pixel Density & Resolution Calculator

Calculate PPI, total megapixels, and pixel dimensions for any screen or print.

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このツールについて

Enter screen diagonal size and resolution to instantly calculate pixel density (PPI/DPI), total megapixels, and aspect ratio. Compare two devices side by side, calculate the pixel dimensions needed for a print at a given DPI and size, or convert between pixel dimensions and physical measurements. Includes a reference table of common screens and their PPI.

使い方

1 Enter the screen diagonal in inches and the horizontal and vertical pixel resolution.
2 Click 'Calculate PPI' to see pixel density, megapixels, and aspect ratio.
3 Use the Device Comparison section to compare two screens.
4 Use the Print Calculator to find pixel dimensions needed for a specific print size and DPI.
5 Check the reference table for PPI values of popular devices.

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