What is the formula to calculate PPI?

To calculate PPI, find the diagonal resolution in pixels using the Pythagorean theorem, then divide by the physical diagonal screen size in inches: dp = sqrt(w^2 + h^2) and PPI = dp / di.

What is the difference between PPI and DPI?

PPI (Pixels Per Inch) refers to the density of pixels on a digital display. DPI (Dots Per Inch) refers to the density of ink dots printed on a page. While often used interchangeably, they apply to different mediums.

What is a good PPI for a computer monitor?

For desktop computer monitors, a PPI of 90 to 110 is standard and provides comfortable viewing at typical desk distances. High-resolution displays often have a PPI of 140 to 160 or higher.

PPI Calculator

Calculate the Pixels Per Inch (PPI) and Pixel Pitch of any screen based on resolution and size.

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Parameters

R Reset

Width (pixels)Horizontal width in pixels or geometry unit.

1,920

150,000

Height (pixels)

1,080

150,000

Screen Diagonal (inches)Screen diagonal measurement in inches.

15.6

1100

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Pixels Per Inch (PPI)

141.21 PPI

Pixel Pitch (Dot Pitch)0.1799 mm

Diagonal resolution2,203 Pixels

Physical Area density19,941 pixels/sq in

Mathematical Explanation

\text{PPI} = \frac{\sqrt{W^2 + H^2}}{D}

Calculates pixels per inch density. Computes diagonal pixel count using the Pythagorean theorem, divided by physical diagonal inches.

How to Use the PPI Calculator

Calculate your screen's pixel density with our free PPI calculator. Input the horizontal and vertical resolution (in pixels) and the diagonal physical screen size (in inches) to determine the Pixels Per Inch (PPI) and pixel pitch of any monitor, phone, or television.

Input variables:

Width (pixels): Bounded parameter in the mathematical model.
Height (pixels): Bounded parameter in the mathematical model.
Screen Diagonal (inches): Bounded parameter in the mathematical model.

PPI Calculator Explained: Formula, Math, and Applications

Learn the mathematics, formulas, and real-world applications behind the PPI Calculator.

Read Full Guide →