About

calculateppi.com is a free, fast tool to compute pixels per inch (PPI) from any screen's resolution and size. No account, no tracking scripts, no clutter — just the number you came for, plus a Retina check and device comparison.

It was built to settle the everyday question: "how sharp is this display, really?" Whether you're buying a phone, spec'ing a monitor, or just curious, the calculator gives an instant, accurate answer.

The site is a static web app — it runs entirely in your browser, so your inputs never leave your device.