Tools

PPI Calculator and Screen Comparison

Calculate pixels per inch, pixel pitch and physical screen dimensions, then compare two displays using their resolution and diagonal size.

Calculators
PPI Calculator and Screen Comparison

Calculate pixels per inch, pixel pitch and physical screen dimensions, then compare two displays using their resolution and diagonal size.

Pixel density
Display A
Pixels per inch108.79PPI
Pixel pitch0.2335 mm
Width59.77 cm
Height33.62 cm
Display B
Pixels per inch163.18PPI
Pixel pitch0.1557 mm
Width59.77 cm
Height33.62 cm
Density difference

Display B has 50.0% higher pixel density than display A.

PPI = √(width² + height²) ÷ diagonal in inches. Pixel pitch = 25.4 ÷ PPI.

Use the panel’s native resolution and viewable diagonal, not the browser viewport. PPI is physical pixel density and differs from operating-system scaling or print DPI.

Compare pixel density using real panel specifications

Enter the native resolution

Use the panel’s native pixel width and height from the manufacturer specifications. Do not enter the browser viewport or scaled desktop size.

Set the viewable diagonal

Enter the display diagonal in inches or centimeters. The calculator derives PPI, pixel pitch and physical width and height.

Compare another display

Enable display B to compare pixel density. The difference is relative to display A and does not measure color, response time or overall image quality.

PPI Calculator and Screen Comparison

Higher PPI means smaller physical pixels at the same screen size. How sharp a display looks also depends on viewing distance, vision, content and scaling.

Calculators

Use the visible display diagonal rather than the outer case size.

Portrait and landscape orientations have the same PPI when width and height are swapped.

Computed dimensions assume square pixels and a rectangular display area.

Related tests

Screen Size Calculator

Calculators

Calculate physical width, height, area, aspect ratio, and pixel density from diagonal size and resolution.

Aspect Ratio Calculator

Calculators

Reduce any resolution to its display ratio and calculate a missing dimension from a target proportion.

Resolution Checker

Device information

Read viewport size, screen pixels, device pixel ratio, color depth, orientation, and measured browser refresh rate.

Monitor Screen Test

Device guides

Run a guided monitor inspection for pixel defects, backlight bleed, gray uniformity and tonal detail. Record your own observations and download a checklist.

Frequently asked questions

Is PPI the same as DPI or device pixel ratio?

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PPI describes physical display pixel density. Print DPI describes printing dots, and device pixel ratio describes browser scaling. They are not interchangeable.

Can the website detect my physical screen size?

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Not reliably. Enter the viewable diagonal from the device specifications. The calculation runs locally and does not require hardware permissions.