Getting Started
Welcome to our comprehensive guide library. Whether you're a designer, developer, or just curious about display technology, these guides will help you understand screen DPI, PPI, resolution, and everything in between.
Start by calculating your screen's DPI to see these concepts in action on your own display.
Essential Guides
72 DPI vs 96 DPI
The historical origins of 72 and 96 DPI standards, why Mac and Windows chose different numbers, and what they mean for modern displays.
96 DPI vs 300 DPI
Understanding the critical difference between screen resolution (96 DPI) and print resolution (300 DPI), and how to convert between them.
What is a Retina Display?
Apple's high-density screen technology explained. Learn about the 220+ PPI standard and how Retina displays achieve invisible pixels.
How PPI Calculators Work
The mathematics behind pixel density calculations. Learn the formulas used to determine screen PPI and physical dimensions.
Does DPI Matter for Web Design?
When pixel density matters for web development and when it doesn't. Understanding CSS pixels, device pixel ratio, and responsive images.
How to Measure Monitor Size
Step-by-step instructions for measuring your screen's diagonal size, calculating dimensions, and determining physical screen area.
Reference Guides
Standard Monitor Resolutions
Comprehensive list of common display resolutions from HD to 8K, including pixel dimensions, aspect ratios, and typical uses.
Common Laptop Screen Sizes
Complete reference of laptop screen sizes, resolutions, and typical PPI values across different manufacturers and price points.
Phone Pixel Density List
Database of smartphone screen specifications including resolution, size, and PPI for popular iPhone and Android models.
CSS Pixels to Inches
Understanding the relationship between CSS pixels, physical pixels, and real-world measurements. Conversion formulas and practical examples.
Common Questions
What's the difference between DPI and PPI?
DPI (Dots Per Inch) technically refers to printer resolution, while PPI (Pixels Per Inch) is the correct term for screens. However, they're often used interchangeably.
Why does my computer report 96 DPI when my screen is higher?
96 DPI is a logical reference value used by operating systems, not your actual physical pixel density. See our 72 vs 96 DPI guide for the full story.
Is higher DPI always better?
Not necessarily. Beyond certain thresholds (like Retina displays), additional pixel density provides diminishing returns while increasing GPU requirements and cost.
How do I calculate my screen's actual DPI?
Use our DPI Calculator with credit card calibration for the most accurate measurement, or manually calculate using screen size and resolution.
Tools & Resources
- Screen DPI Calculator — Measure your screen's pixel density
- About This Project — Learn how this tool works
- Contact Us — Questions or feedback