Device Pixel Density Calculator
Calculate your screen's pixel density (PPI) instantly. Perfect for optimizing images, designing responsive layouts, and comparing display quality across devices.
What is Pixel Density (PPI)?
Pixel density, measured in pixels per inch, tells you how many pixels are packed into each inch of your screen. The higher your PPI, the sharper and clearer the images and text look. This matters for designers, developers, photographers, and anyone wanting optimized content that looks perfect on their device.
How Our Calculator Works
Our tool automatically detects your screen resolution and uses advanced algorithms to estimate your display's physical size. It then calculates the pixel density using the Pythagorean theorem:
PPI = √(width² + height²) ÷ diagonal size in inches
The result shows how many pixels fit into one inch of your display, giving you a clear measure of screen sharpness.
Understanding Pixel Density
Pixel density, measured in PPI (pixels per inch), indicates how many pixels are packed into one inch of screen space. Higher PPI means:
- Sharper images - More detail and clarity in photos and graphics
- Crisper text - Smoother, more readable fonts at all sizes
- Better user experience - More professional-looking interfaces
PPI Quality Categories
- <100 PPI (Ultra Low): Very pixelated, typical of old CRTs, early laptops
- 100-149 PPI (Low Resolution): Noticeable pixels, standard old desktop monitors (720p–1080p at large sizes)
- 150-199 PPI (Standard Resolution): Decent sharpness, typical of many non-Retina laptops and tablets
- 200-249 PPI (High Resolution): Sharp, good for productivity, often marketed as "Retina-like" on laptops
- 250-329 PPI (Retina / Very High): Pixels barely visible at normal viewing distances; MacBooks, iPads, Surface Pro
- 330-499 PPI (Ultra Retina): Extremely sharp; flagship smartphones, 4K UHD on small laptops
- 500+ PPI (Superfine / Print Quality): Beyond human eye perception at normal distances, closer to print quality
Want to learn more about screen specifications and display technology? Check out our comprehensive guide on screen resolution, size, and pixel density.