PPI calculator
Pixel density from resolution and screen size. The width and height are prefilled from your own display — add its diagonal size (check the model number or spec sheet) to get PPI and dot pitch.
Pixel density FAQ
- What is PPI?
- Pixels per inch — how densely a display packs its pixels, calculated from the resolution and the physical diagonal size. Two monitors with identical resolutions can look very different: 1920×1080 is crisp on a 13-inch laptop (~170 PPI) and coarse on a 27-inch monitor (~82 PPI).
- What's a good PPI?
- It depends on viewing distance. For desktop monitors at arm's length, ~90–110 PPI is standard and ~140–220 PPI looks noticeably sharper. Laptops viewed closer benefit from 150–250 PPI. Phones held nearer still commonly exceed 400 PPI. Past the point where your eye can resolve individual pixels at your distance, more PPI adds little.
- Is PPI the same as DPI?
- They're often used interchangeably, but strictly PPI describes display pixel density while DPI (dots per inch) describes printer dots. For screens, PPI is the correct term; a printed photo at 300 DPI is a different measurement entirely.