PPI Calculator

PPI, or Pixels Per Inch, is a measurement of the pixel density of an electronic display. It tells you how many individual pixels are packed into a one-inch line on the screen. A higher PPI means the pixels are smaller and closer together, resulting in a sharper, crisper, and more detailed image. When comparing two monitors, the resolution alone doesn't tell the whole story—you need the PPI.

Why PPI Matters for Monitors

A 4K resolution (3840x2160) looks incredibly sharp on a 27-inch monitor (163 PPI), but stretch that same 4K resolution across a massive 65-inch TV, and the density drops to just 68 PPI. If you sit too close to the TV, the image will look pixelated. Knowing the PPI helps you determine the optimal viewing distance and whether a display will look 'Retina' sharp to your eyes.

The 'Retina' Standard

Apple popularized the term 'Retina display' to describe a screen where the pixels are so dense that the human eye cannot distinguish individual pixels from a normal viewing distance. For a smartphone held at 10-12 inches away, this is typically around 300 PPI. For a desktop monitor viewed from 2 feet away, 'Retina' sharpness is achieved at around 110-160 PPI depending on your visual acuity.