Calculate the Pixels Per Inch (PPI) of any display. Essential for designers and developers to check screen sharpness.
PPI stands for Pixels Per Inch. It measures the pixel density of a digital screen (like a monitor, smartphone, or tablet).
A higher PPI means more pixels are packed into the same physical space, resulting in sharper images and clearer text. "Retina" displays typically have a PPI high enough that the human eye cannot distinguish individual pixels at a normal viewing distance.
The calculation involves the Pythagorean theorem to find the diagonal resolution in pixels, which is then divided by the diagonal screen size in inches.
For standard desktop monitors, 90-110 PPI is typical (e.g., 24" 1080p). For closer viewing or "Retina" quality on desktops, look for 150-220 PPI (e.g., 27" 5K).
Technically, no. PPI refers to screens (pixels), while DPI (Dots Per Inch) refers to printers (ink dots). However, the terms are often used interchangeably in casual conversion.
