PPI Calculator (Pixels Per Inch)
Calculate pixel density and display quality metrics for screens and digital images
Calculate Pixels Per Inch (PPI)
Number of pixels horizontally
Number of pixels vertically
Physical diagonal measurement of the screen
PPI Calculation Results
Formula: PPI = √(width² + height²) ÷ diagonal size
Calculation: √(0² + 0²) ÷ 0.00 inches = 0.0 PPI
Example: iPhone 14 Pro
Resolution: 1179 × 2556 pixels
Screen Size: 6.1 inches diagonal
Diagonal Pixels: √(1179² + 2556²) = 2,817 pixels
PPI: 2,817 ÷ 6.1 = 461.8 PPI
Quality: Ultra High (XXXHDPI) - Premium display quality
PPI Quality Guide
Popular Device PPIs
PPI Tips
Higher PPI means sharper, more detailed images
Smartphones typically have 300-500+ PPI
Desktop monitors range from 72-300 PPI
Apple's "Retina" displays start at ~300 PPI
Viewing distance affects perceived sharpness
Understanding Pixels Per Inch (PPI)
What is PPI?
PPI (Pixels Per Inch) is a measurement of pixel density that indicates how many pixels fit into a 1-inch line on a display or digital image. It's a key metric for determining display sharpness and image quality.
Why Does PPI Matter?
- •Determines display sharpness and clarity
- •Affects text readability and image detail
- •Important for graphic design and photography
- •Influences user experience on digital devices
PPI vs DPI
PPI: Pixels Per Inch - for digital displays and images
DPI: Dots Per Inch - for printed materials and printers
Calculation Formula
PPI = √(width² + height²) ÷ diagonal
Where width and height are in pixels, and diagonal is in inches
Tip: Higher PPI doesn't always mean better - consider viewing distance and use case
Dot Pitch and Pixel Density
Dot Pitch
The distance between the centers of two adjacent pixels, measured in millimeters. Smaller dot pitch means higher pixel density and sharper images.
Formula: Dot Pitch = 25.4 ÷ PPI (in mm)
Pixels Per Square Inch
The total number of pixels within a 1-inch × 1-inch area. This gives a measure of pixel density across the entire display surface.
Formula: PPI² = Pixels per Square Inch