PPI (Pixels Per Inch) measures screen pixel density. Higher PPI means sharper, more detailed displays. For example, iPhone Retina screens have PPI above 326, where individual pixels become indistinguishable at normal viewing distance.

What's the difference between PPI and DPI?

PPI (Pixels Per Inch) is for digital displays, while DPI (Dots Per Inch) is for printing. While often used interchangeably on digital devices, PPI technically refers to pixel density and DPI to print resolution. This calculator measures PPI.

How do you calculate screen PPI?

PPI formula: First calculate diagonal pixels = √(width² + height²), then PPI = diagonal pixels ÷ screen size in inches. For example, 1920×1080 on a 24" screen: PPI = √(1920²+1080²) ÷ 24 ≈ 91.8.

What is a Retina display?

Retina is Apple's marketing term for displays with pixel density high enough that individual pixels are invisible at normal viewing distance. Generally PPI ≥ 300 qualifies as Retina-level. iPhone Retina PPI ranges from 326 to 460.

Phones: 300+ PPI is excellent (Retina), 400+ is flagship. Tablets: 250+ is excellent. Laptops: 200+ is excellent. Desktop monitors: 90-110 is standard, 140+ is high-res. For the same size, higher PPI means better display quality.

Does this tool upload my data?

No. All calculations run locally in your browser with no network requests. Your data never leaves your device.

🔍 PPI/DPI Pixel Density Calculator

Enter screen resolution and diagonal size to calculate pixel density (PPI) instantly. Works for phones, tablets, monitors, and TVs.

📐 Calculate Pixel Density

Horizontal Pixels (Width)

Vertical Pixels (Height)

Screen Size

Unit

📱 Common Device PPI Reference

💡 PPI Rating Scale

🟢 Flagship (400+ PPI)Flagship phone/tablet

🟢 Excellent (300-400 PPI)Retina phone

🔵 Good (200-300 PPI)Laptop/tablet

⚪ Average (100-200 PPI)Standard monitor

🔴 Low (<100 PPI)Old monitor/TV

What is PPI/DPI Pixel Density Calculator - Screen PPI ToolBase?

PPI/DPI Pixel Density Calculator - Screen PPI ToolBase is a free online tool that runs entirely in your browser. No download or signup needed — enter Horizontal Pixels and Vertical Pixels to get results instantly. All data is processed locally.

Use Cases

Verify mathematical calculations during study or teaching
Solve geometry problems quickly in engineering work
Calculate ratios and percentages in daily life
Mobile math calculations without a calculator app

Key Features

Completely Free: No registration, no limits
Privacy Safe: Data never leaves your browser
Cross-Platform: Any modern browser
Zero Dependencies: Open and use