About Screen PPI, DPI & Retina Viewing Distance Calculator
Precision display engineering and visual acuity calculator for designers, front-end developers, gamers, and hardware enthusiasts. Computes exact Pixels Per Inch (PPI), dot pitch in millimeters, total megapixels, physical panel dimensions (inches & cm), Apple 'Retina' distance threshold (3438 / PPI), and angular resolution in Pixels Per Degree (PPD) with presets for iPhone, iPad, MacBook, monitors, and 4K TVs.
Key Capabilities & Features
- Exact pixel density (PPI) and dot pitch (mm) calculation across any custom resolution and diagonal
- Apple Retina distance threshold formula (3438 / PPI) based on 1 arcminute human visual acuity
- Angular resolution (Pixels Per Degree - PPD) audit at your current custom viewing distance
- Physical screen width and height dimensions in both inches and centimeters
- Instant presets: iPhone 15 Pro, Galaxy S24, MacBook Pro, 27" 4K/1440p, Ultrawide, and OLED TVs
How to Use Screen PPI, DPI & Retina Viewing Distance Calculator
Select Device or Enter Resolution
Choose a popular smartphone, laptop, or monitor preset, or type custom horizontal and vertical pixels.
Adjust Screen Size & Distance
Drag the diagonal slider to your screen size (inches) and set your actual viewing distance.
Inspect PPI & Retina Limit
View exact PPI, dot pitch, and verify whether individual pixels are imperceptible to 20/20 vision.
Privacy & In-Browser Execution Guarantee
100% client-side optical math. Zero display dimensions or hardware specs leave your browser.
Frequently Asked Questions
What is the difference between PPI and DPI?
PPI (Pixels Per Inch) measures the digital pixel density of physical electronic displays (screens, monitors, phones). DPI (Dots Per Inch) refers strictly to physical ink droplets produced by printers on physical paper.
How does the Apple Retina distance formula work?
A screen qualifies as 'Retina' when the human eye can no longer discern individual pixels. For a person with standard 20/20 vision (who can resolve 1 arcminute = 1/60th of a degree), this threshold occurs mathematically at a viewing distance equal to 3438 divided by the display's PPI.