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Input display resolution and diagonal size to instantly calculate PPI, total pixels, and dot pitch.
Enter screen resolution and diagonal size to view pixel density.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Pixels per inch (PPI) expresses how many display pixels fit along one physical inch. Enter horizontal resolution W, vertical resolution H, and the screen’s diagonal D in inches. The calculator derives the diagonal pixel count using the Pythagorean theorem, then divides by the physical diagonal:
Diagonal pixels = √(W² + H²)
PPI = √(W² + H²) ÷ D
Pixel pitch (mm) = 25.4 ÷ PPI
For a 1920 × 1080 display measuring 24 inches diagonally, the pixel diagonal is about 2202.91, so density is about 91.79 PPI. The results also include aspect ratio, total megapixels, estimated physical width and height, pixel pitch, and an approximate viewing-distance figure. Physical dimensions are inferred from the entered pixel ratio and diagonal.
This calculation describes a display’s physical pixel density. Printer DPI usually describes printer dots per inch, a different output quantity. Android dp is a density-adjusted interface layout unit, not the physical pixel density of a particular panel. Use the display’s native pixel resolution and measured or specified screen diagonal for a screen comparison.
The viewing-distance result uses a simplified one-arcminute geometry estimate. It is not a universal threshold for eyesight, a guarantee that pixels will be invisible, or a score for overall display quality.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter the horizontal and vertical pixel counts, such as 1920 and 1080. Use the panel resolution, not a scaled desktop workspace size.
Enter the screen diagonal in inches. A 24-inch diagonal is entered as 24; do not enter the width of the monitor body.
Optionally choose a preset, then verify that its resolution and diagonal match the display you are comparing.
Read PPI and the supporting metrics. Reset clears the three inputs if you want to start another comparison.
To reproduce the example, enter 1920, 1080, and 24. The result is approximately 91.79 PPI, 0.277 mm pixel pitch, and 2.07 megapixels. Displayed values are rounded, so tiny differences in the last digit can result from rounding.
Use cases
See how the tool fits into real work and everyday tasks.
Compare two monitor sizes at the same resolution to see how a larger panel changes pixels per inch while leaving total pixel count unchanged.
Compare devices using their stated pixel resolution and diagonal. Treat PPI as one measurable specification, not a substitute for viewing the screens in person.
Use the aspect ratio and estimated physical dimensions as a quick check when discussing display specifications. Interface scaling and rendered layout units require separate consideration.
Q&A
Find concise answers to common questions and confusing cases.
No. PPI describes pixel density from resolution and diagonal size. Viewing distance, panel characteristics, operating-system scaling, and content also affect what a person sees.
It is derived from the entered diagonal and pixel aspect ratio, assuming square pixels and that the stated diagonal describes the active image area. It does not measure the bezel or outer monitor dimensions.
No. It is a simplified geometric reference based on a one-arcminute model. Individual vision and viewing conditions vary, so it should not be treated as a universal cutoff.
Notes
Review scope, result limitations, and important precautions before use.
Incorrect input resolution or diagonal changes every derived result. Manufacturer-listed diagonals may be rounded, and the physical-size outputs are calculations rather than measurements. PPI alone does not establish display quality or how sharp a screen will look at a particular distance.
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