What is the difference between PPI and DPI?

PPI (pixels per inch) refers to digital display screen density, while DPI (dots per inch) refers to physical ink droplet density in printing.

What is Apple's Retina display threshold?

Apple defines Retina as the density at which individual pixels cannot be discerned at normal viewing distances (approx 220+ PPI for laptops, 300+ PPI for phones).

What does dot pitch measure?

Dot pitch measures the physical distance between adjacent subpixel centers in millimeters; smaller numbers indicate sharper images.

Calculators• Display Specs

Screen PPI & Display Pixel Density Calculator

Evaluate display sharpness for monitors, smartphones, laptops, and tablets. Calculate pixels per inch (PPI), total megapixel resolution, and physical dot pitch.

Calculations run client-side in browser.

Display Dimensions

Width (Pixels)

Height (Pixels)

Diagonal Size (Inches)

Pixel Density

109 PPI

Standard Density

Dot Pitch:0.233 mm

Aspect Ratio:16:9

Total Resolution:3.69 Megapixels

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How to Use Screen PPI & DPI Calculator

Enter Screen Resolution

Enter horizontal and vertical pixels (e.g. 1920x1080, 2560x1440, 3840x2160).

Enter Diagonal Size

Provide diagonal screen size in inches (e.g. 27" or 6.1").

Review Display Metrics

See calculated PPI, dot pitch, aspect ratio, and total pixel count.

About Screen PPI & DPI Calculator

Calculates diagonal pixel count d_p = sqrt(w^2 + h^2), then computes PPI = d_p / d_i. Dot pitch (subpixel spacing) is the reciprocal converted to millimeters (25.4 / PPI).

Supported Formats

InchesCentimetersPixels

Operational Limits

•Calculations assume square physical subpixels.

Key Features

Pythagorean diagonal pixel calculation: sqrt(w^2 + h^2) / inches
Calculates exact dot pitch in millimeters
Displays standard aspect ratio (16:9, 16:10, 21:9, 4:3)
Sharpness classification (Retina, High Density, Standard)
Presets for iPhone, MacBook, 4K monitors, and ultrawide displays

Frequently Asked Questions

100-110 PPI is standard for 24" 1080p or 27" 1440p monitors, while 140-165+ PPI represents crisp 4K Retina-grade sharpness.

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