🖥️Pixel Density Calculator (PPI)

Calculate pixels per inch (PPI) from screen resolution and size.

Width (px)

Height (px)

Screen Size (inches)

Pixel Density

81.6 PPI

Total Pixels

2,073,600

Aspect Ratio

16:9

Retina?

About Pixel Density Calculator (PPI)

Calculate the pixel density (PPI — pixels per inch) of any display from its resolution and physical screen size. Enter the horizontal and vertical pixel counts along with the diagonal screen size in inches to get the exact PPI. Compare displays for image sharpness and determine optimal viewing distances.

How to Use Pixel Density Calculator (PPI)

1
Enter resolution
Type the horizontal and vertical pixel count of your display (e.g. 1920 × 1080).
2
Enter screen size
Type the diagonal screen size in inches (e.g. 27).
3
View results
See the calculated PPI, total pixels, and aspect ratio.

Common Use Cases

Comparing display sharpness when shopping for monitors
Determining if a display qualifies as retina/HiDPI
Calculating optimal viewing distance for a given PPI
UI/UX design decisions for different device pixel densities

Frequently Asked Questions

What is a good PPI for a monitor?

Standard desktop monitors are 90-110 PPI. Retina/HiDPI displays are 200+ PPI. For phones, 300+ PPI is considered 'retina' quality where individual pixels are invisible at normal viewing distance.

What is the difference between PPI and DPI?

PPI (pixels per inch) measures screen pixel density. DPI (dots per inch) measures print density. They're often used interchangeably but technically refer to different things.

How is PPI calculated?

PPI = √(width² + height²) / diagonal size in inches. It uses the Pythagorean theorem to find the diagonal pixel count, then divides by the physical diagonal.