DPI / PPI Calculator

Compute pixel density from resolution & diagonal — and reverse it.

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See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use DPI / PPI Calculator

Follow these steps — everything happens instantly in your browser.

  1. 1

    Step 1. Forward: enter the screen's width, height (in pixels) and diagonal (in inches).

  2. 2

    Step 2. Read the PPI plus physical dimensions and aspect ratio.

  3. 3

    Step 3. Reverse: enter PPI, diagonal and an aspect ratio to compute a matching resolution.

Why use this tool

Frequently asked questions

Everything you might want to know about dpi / ppi calculator.

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