What is PPI and why does it matter?

PPI (Pixels Per Inch) measures pixel density. Higher PPI means sharper images and text because pixels are packed more tightly. For smartphones, 400+ PPI is considered retina quality, while for monitors, 100-150 PPI is typical.

Is higher resolution always better?

Not necessarily. Higher resolution requires more GPU power, and the benefits diminish beyond what the human eye can perceive at typical viewing distances. For a 27-inch monitor viewed from 2 feet, 4K (3840x2160) provides noticeable improvement over 1440p, but 8K would be overkill.

What's the difference between PPI and DPI?

PPI (Pixels Per Inch) refers to screen pixel density, while DPI (Dots Per Inch) refers to printer resolution. They're often used interchangeably but technically measure different things. PPI is what matters for display quality.

Screen Resolution & PPI Calculator

Calculate PPI, pixel density, aspect ratios, and optimal viewing distances. Compare different displays, understand screen technologies, and make informed decisions about your devices.

Width (pixels)

Height (pixels)

Screen Size (inches)

Width: 1,920 pixels

Height: 1,080 pixels

Screen Size: 24 inches

Popular Device Presets

Comprehensive Screen Analysis for All Your Devices

Monitor Selection

Choose the perfect monitor based on PPI and viewing distance for your needs

Smartphone Comparison

Compare pixel density across different smartphones and tablets

TV Setup Guide

Find the optimal viewing distance and resolution for your home theater

Device Comparison

Compare multiple devices to make informed purchasing decisions

Screen Resolution Formulas & Real-World Examples

Essential Formulas

PPI (Pixels Per Inch):
√(width² + height²) ÷ diagonal

Aspect Ratio:
GCD(width, height) simplified

Total Pixels:
width × height

Optimal Viewing Distance:
(diagonal × 1.5) ÷ (PPI ÷ 100)

Common Examples

24" 1080p Monitor:
91.8 PPI - Good for general use

27" 4K Monitor:
163.2 PPI - Excellent for design work

iPhone 15 Pro:
460 PPI - Ultra sharp display

65" 4K TV:
67.8 PPI - Best viewed from 6+ feet

Display Selection Tips:

PPI Matters Most: Higher PPI means sharper text and images. Viewing Distance: Choose resolution based on how far you sit from the screen. Use Case: Gaming benefits from high refresh rates, design work needs accurate colors and high PPI.

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'This PPI calculator helped me choose the perfect monitor for my design work. The comparison tool made it easy to see the real-world difference between 4K and QHD displays.'

- Alex R., Graphic Designer

Screen Resolution FAQs

Answers to common questions about display technology