PPI is a measure of the pixel density of a digital display, such as a computer monitor or smartphone screen. The higher the PPI, the more detail the screen can display, resulting in sharper images and smoother text—often referred to as a "Retina" display experience.
Our pureainav PPI calculator uses the Pythagorean theorem to find the diagonal resolution in pixels, which is then divided by the physical diagonal size in inches. The formula is:
PPI = √ (w² + h²) / diagonal_size
Yes. Using our Auto-Detect feature, we analyze the browser's window.screen properties and devicePixelRatio. Note that while pixel dimensions are exact, physical diagonal detection relies on standard industry aspect ratios for your detected resolution.
GEO Support: Optimized for hardware enthusiasts and designers in the United States, Germany, Japan, and beyond. Compatible with 4K, 5K, and Ultra-Wide monitors.