Screen sharpness checker
Device Pixel Density Calculator (PPI Checker)
Calculate screen pixel density (pixels per inch) instantly to compare display sharpness, optimize image assets, and choose the right resolution for each device.
Quick reference
150-199 PPI
Standard clarity for most displays
250-329 PPI
Retina-like sharpness zone
330+ PPI
Premium smartphone-level density
What is pixel density (PPI)?
Pixel density tells you how many pixels are packed into one inch of display. Higher PPI generally means cleaner text, sharper UI edges, and better image detail across phones, laptops, tablets, and desktop monitors.
Sharper text
Smoother typography at small sizes.
Cleaner graphics
More detail in icons and imagery.
Better fidelity
More polished look across apps and sites.
How this calculator works
1. Read resolution
Uses detected screen width and height in pixels.
2. Estimate diagonal
Approximates physical panel size in inches.
3. Compute PPI
Applies the pixel-density formula below.
PPI Formula
PPI = sqrt(width^2 + height^2) / diagonal inches
PPI quality bands
<100 PPI
Ultra Low
Very pixelated output.
100-149 PPI
Low
Visible pixels in many cases.
150-199 PPI
Standard
Solid everyday sharpness.
200-249 PPI
High
Crisp for productivity use.
250-329 PPI
Retina / Very High
Pixels are difficult to notice.
330-499 PPI
Ultra Retina
Flagship-level clarity.
500+ PPI
Superfine
Near print-like sharpness.
Want to go deeper? Read our guide on screen resolution, size, and pixel density.