Screen PPI (Pixels Per Inch) Calculator
Find the pixel density of any computer monitor, smartphone, or laptop display.
Calculated PPI
141.21 PPI
5.56 px/mm
Understanding Pixels Per Inch (PPI)
Pixels Per Inch (PPI) measures the pixel density of an electronic image display, such as a monitor, laptop screen, tablet, or smartphone. Higher PPI results in sharper images and clearer text.
The formula calculates the diagonal resolution using the Pythagorean theorem: Diagonal Pixels = √(Width² + Height²), then divides by the diagonal screen size in inches.
Calculating your exact display PPI allows our virtual ruler tool to render true 1:1 scale physical dimensions on your screen.
Common Display PPI Benchmarks
- 24-inch Full HD Monitor (1920×1080): ~91.79 PPI
- 27-inch 4K Monitor (3840×2160): ~163.18 PPI
- 15.6-inch Laptop (1920×1080): ~141.21 PPI
- Apple MacBook Air 13.6-inch (2560×1664): ~224.57 PPI
- iPhone 15 (2556×1179, 6.1-inch): ~460 PPI