PPI Calculator
Calculate screen pixel density from resolution, diagonal size, and viewing distance
Calculation Steps
How Screen PPI Is Calculated
Pixel density combines digital resolution with the physical diagonal size of the display.
Pixel density
PPI is the diagonal pixel count divided by the diagonal size in inches. More pixels in the same physical size means higher density.
Pixel pitch
Pixel pitch is the physical width of one pixel. Lower pitch values mean smaller pixels and usually a sharper image.
Viewing distance
Pixels per degree estimates angular sharpness. A display can look sharper when viewed farther away, even if its PPI is unchanged.
PPI Examples
Compare common monitor and laptop display densities.
27-inch QHD monitor
2560 x 1440 at 27 inches is about 109 PPI.
27-inch 4K monitor
3840 x 2160 at 27 inches is about 163 PPI.
27-inch 5K display
5120 x 2880 at 27 inches is about 218 PPI.
PPI Calculator FAQ
Common questions about pixel density, pixel pitch, display size, and viewing distance.
What is PPI?
PPI means pixels per inch. It measures how tightly display pixels are packed across the physical screen size.
How do I calculate screen PPI?
Find the diagonal pixel count from width and height, then divide that by the physical diagonal size in inches.
Is higher PPI always better?
Higher PPI makes pixels smaller, but the benefit depends on viewing distance, scaling, eyesight, and how the display is used.
What is pixel pitch?
Pixel pitch is the physical size of one pixel, usually in millimeters. Smaller pitch means higher pixel density.
What does pixels per degree mean?
Pixels per degree estimates angular sharpness from the display's PPI and your viewing distance. Around 60 PPD is often treated as retina-like.