Resolution & Pixel Density Converter
Common values: 72 (print), 96 (web), 326 (iPhone)
Formula:
Pixels ÷ PPI = Inches
Common Display Resolutions
| Name | Resolution | Aspect Ratio | Common Use |
|---|---|---|---|
| HD (720p) | 1280 × 720 | 16:9 | Entry-level HDTVs, older smartphones |
| Full HD (1080p) | 1920 × 1080 | 16:9 | Standard TVs, monitors, smartphones |
| 2K (QHD) | 2560 × 1440 | 16:9 | High-end monitors, smartphones |
| 4K (UHD) | 3840 × 2160 | 16:9 | Modern TVs, premium monitors |
| 8K (FUHD) | 7680 × 4320 | 16:9 | High-end TVs, professional displays |
| SXGA | 1280 × 1024 | 5:4 | Older desktop monitors |
| WUXGA | 1920 × 1200 | 16:10 | Professional monitors, laptops |
Common Pixel Density (PPI) Values
Print Standards
- 72 PPI: Standard web/screen resolution
- 150 PPI: Minimum for quality printing
- 300 PPI: Magazine/photo quality print
- 600 PPI: Professional photo printing
Desktop Displays
- 96 PPI: Standard Windows display
- 109 PPI: 24" Full HD monitor
- 163 PPI: 27" 4K monitor
- 218 PPI: Apple Retina 5K display
Mobile Devices
- 326 PPI: iPhone Retina display
- 458 PPI: iPhone Pro displays
- 550+ PPI: High-end Android phones
- 264 PPI: iPad Retina display
Understanding Resolution & Pixel Density
Key Concepts
Resolution
Resolution refers to the total number of pixels in a display, typically expressed as width × height (e.g., 1920 × 1080). Higher resolution means more detail can be displayed.
Pixel Density (PPI)
Pixels Per Inch (PPI) measures how many pixels are displayed in one inch of screen space. Higher PPI results in sharper, more detailed images. PPI depends on both resolution and physical screen size.
DPI vs PPI
Dots Per Inch (DPI) traditionally refers to printer resolution, while PPI refers to screen resolution. For digital displays, these terms are often used interchangeably, though PPI is more technically correct.
Calculating PPI
PPI can be calculated using the formula: PPI = √(width² + height²) ÷ diagonal screen size in inches. This gives the pixel density across the diagonal of the display.