PPI Calculator

PPI is the pixel density of a display. From Pythagoras, diagonal pixels = √(width² + height²), then PPI = diagonal pixels ÷ diagonal inches. Higher PPI looks sharper at the same viewing distance.

Width (px)Height (px)Diagonal (inches)

PPI91.79

Pixel diagonal2,202.9 px

Formula

PPI = √(w² + h²) ÷ diagonal inches.

How to use this calculator

Enter native resolution.
Enter advertised diagonal inches.
Read PPI.

Examples

1920×1080 on 24 in

About 91.8 PPI.

FAQ

Is this the same as DPI?+

Same math, different context: PPI for screens, DPI for printers.

Related tools

CalculatorDPI CalculatorFind print size from pixel dimensions and DPI, or pixels needed for a print.CalculatorAspect Ratio CalculatorSimplify a width×height ratio and compute the missing side.CalculatorPixel to Inch CalculatorConvert a pixel length to inches (and mm) at a chosen PPI or DPI.