PPI / DPI Calculator

Calculate pixels per inch (PPI) and dots per inch (DPI) for screens and prints. This tool processes all data locally in your browser. No information is ever sent to any server. Completely free, no registration required.

How to Use the PPI / DPI Calculator

1. Enter your input values above
2. Results update automatically
3. Copy or download the output

What is a PPI / DPI Calculator?

A PPI (Pixels Per Inch) Calculator computes the pixel density of any digital display — smartphone, monitor, laptop, tablet, TV, or VR headset — from its resolution and diagonal screen size. PPI determines display sharpness: a higher PPI means more pixels packed into each inch of screen, producing sharper text and images. Apple's 'Retina' branding kicked off the PPI race; today's smartphones range from 300 PPI (acceptable) to 600+ PPI (flagship). This calculator also determines if a display qualifies as 'Retina' at its typical viewing distance.

How Does It Work?

Enter resolution (width × height) and diagonal screen size. The calculator computes: PPI (horizontal, vertical, and diagonal), total pixels, aspect ratio, and 'Retina' status at typical viewing distances for phone (12\

Formula

PPI = √(Width² + Height²) ÷ Diagonal (inches)\n\nExample: 27\

Who Uses This Tool?

• Monitor shoppers comparing pixel density between 27\
• 1440p (109 PPI)
• Smartphone buyers comparing screen sharpness specs
• Designers ensuring dual monitor setups have matching PPI
• VR developers calculating pixels per degree for headset displays
• Anyone understanding the relationship between resolution, size, and sharpness

Pro Tips

• For desktop monitors: ~110 PPI (1440p at 27\
• (163 PPI) requires 150% scaling for comfortable text — you lose the extra workspace
• For laptops: 150-250 PPI with appropriate OS scaling is ideal. MacBooks default to ~220 PPI at 2× scaling. Windows laptops work best at 140-200 PPI
• PPI alone doesn't tell the full sharpness story — viewing distance matters. A 50\
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Frequently Asked Questions about PPI / DPI Calculator

Is higher PPI always better?

Up to a point. Beyond ~400 PPI at phone distance, the human eye can't distinguish individual pixels. Further increases drain battery without visible benefit. For monitors, PPI that forces scaling >125% wastes the extra resolution.

Free online PPI / DPI Calculator — no signup, 100% client-side processing. All data stays in your browser.