Screen PPI & DPI Calculator
Calculate pixel density (PPI), dot pitch, and optimal retina viewing distance for monitors, laptops, and smartphones.
Technical Metrics & Telemetry
Pixel Density
-- PPI
Dot Pitch
-- mm
Aspect Ratio
--
Optimal Retina Distance
--
How to Use This Tool
STEP 1
Enter Display Specifications
Input your screen's diagonal size
in inches along with width and height in pixels.
STEP 2
Or Choose a Preset
Select common monitor sizes like
24" 1080p, 27" 1440p, or 4K UHD from the preset dropdown.
STEP 3
Review Retina Distance
View the minimum distance where
individual pixels become completely imperceptible to human vision.
Frequently Asked Questions
What is PPI and why does it matter?
PPI stands for Pixels Per Inch. A higher PPI means sharper text, smoother curved edges, and greater detail
without seeing pixelation.
What is considered 'Retina' resolution?
A display is considered 'Retina' when the human eye with 20/20 vision cannot distinguish individual pixels
at a typical viewing distance (~300 PPI for phones, ~110-160 PPI for desktop monitors).
How is optimal viewing distance calculated?
It uses the visual acuity formula: Distance = 3438 / PPI. At this distance, each pixel subtends an arc of
1 arcminute, the limit of human 20/20 visual resolution.
What is dot pitch?
Dot pitch is the physical distance between the centers of two adjacent pixels, measured in millimeters.
Smaller dot pitch indicates a crisper image.