Pixels Per Inch, a measure of screen or image sharpness/density.

How is PPI calculated?

PPI = diagonal resolution in pixels ÷ diagonal screen size in inches.

Why does higher PPI look sharper?

More pixels packed into the same physical space means individual pixels become less perceptible to the human eye.

PPI (Pixels Per Inch) Calculator

Pixels per inch (PPI) measures how densely packed a screen's pixels are — a higher PPI means a sharper, more detailed image at normal viewing distance.

Horizontal Resolution (px)

Vertical Resolution (px)

Screen Diagonal Size (inches)

Instant Result

Pixels Per Inch (PPI) -

Diagonal Resolution (px) -

What Is a Screen PPI (Pixels Per Inch) Calculator?

Pixels per inch (PPI) measures how densely packed a screen's pixels are — a higher PPI means a sharper, more detailed image at normal viewing distance. This calculator finds a display's PPI from its resolution and physical diagonal screen size, handy for comparing monitors, phones, or TVs.

How to Use This Screen PPI (Pixels Per Inch) Calculator

Enter the screen's horizontal resolution in pixels.
Enter its vertical resolution in pixels.
Enter the screen's diagonal size in inches (the number usually used to describe screen size, like '27 inch monitor').
Click Calculate to get the pixel density in PPI.

Formula

Diagonal Resolution (px) = √(Width² + Height²)
PPI = Diagonal Resolution (px) / Diagonal Size (inches)

Worked Example

A 27-inch monitor with a 2560×1440 resolution. Diagonal Resolution = √(2560² + 1440²) ≈ 2937.5 px. PPI = 2937.5 / 27 ≈ 108.8 PPI — a sharp, commonly used density for desktop monitors.