PPI (Pixel Density) Calculator

About this calculator

This calculator determines a screen's pixel density (PPI, pixels per inch) from its horizontal and vertical resolution and its diagonal size, along with related figures like dot pitch (the physical distance between pixels) and total megapixels. Higher PPI means individual pixels are packed more tightly together, which is what makes text and images look sharp rather than grainy at normal viewing distance.

This figure matters to anyone comparing monitors, phones or TVs on paper specs before buying, since a larger screen with the same resolution as a smaller one actually has a lower PPI and will look noticeably less crisp. Designers and developers also use PPI to decide how large to make interface elements and images so they render sharply across devices with different pixel densities, and photographers reference it when deciding print sizes that will still look sharp to the naked eye.