Calculators Tool
Back to All Tools

DPI / PPI Calculator

Calculate screen pixel density (PPI/DPI), total pixels, diagonal resolution, and display dot pitch from screen width, height, and diagonal size.

Presets:

Display Parameters

Calculated Density
91.79
Pixels Per Inch (PPI / DPI)
Diagonal Pixels

2202.9 px

Dot Pitch (Pixel Size)

0.2767 mm

Aspect Ratio

16:9

Total Megapixels

2.07 MP

Formula: PPI = √(1920² + 1080²) ÷ 24.00 in = 91.79

How to Use the DPI / PPI Calculator

  1. 1Enter screen horizontal resolution (e.g. 1920, 2560, 3840) and vertical resolution (e.g. 1080, 1440, 2160).
  2. 2Input the physical diagonal screen size in inches (e.g. 24, 27, 32, 15.6, 6.7).
  3. 3View the instant calculated PPI (Pixels Per Inch), diagonal pixel count, aspect ratio, dot pitch, and total megapixels.

Key Features & Capabilities

  • Calculates exact PPI using Pythagorean diagonal theorem
  • Supports standard display presets (FHD, 2K, 4K, 8K, iPhone, iPad, MacBook)
  • Computes Dot Pitch (pixel size in millimeters) and total display area
  • Instant real-time update with zero lag and unit switching (inches / cm)

Frequently Asked Questions

What is the difference between DPI and PPI?

PPI (Pixels Per Inch) measures the pixel density of digital screens, whereas DPI (Dots Per Inch) originally refers to the density of physical ink dots laid down by a printer. In digital web design and software, the two terms are often used interchangeably to describe display resolution density.

What is the formula for calculating PPI?

The formula is PPI = sqrt(width_px^2 + height_px^2) / diagonal_inches. For example, a 1920x1080 screen on a 24-inch monitor has a diagonal pixel count of 2202.9 and a PPI of 91.79.

More Popular Tools

Image Resize & Dimension CalculatorUniversal Color Converter (HEX, RGB, HSL, HSV, CMYK)HEX to RGB & RGBA Color ConverterRGB to HSL & HSV Color Converter