Current screen geometry
Calculate to see a diagram synchronized with the current result.
Screen Size Calculator
Enter a screen diagonal and aspect ratio to calculate the corresponding display width and height.
Settings
Enter a valid value.
Enter a valid value.
Enter a valid value.
Enter a valid value.
Enter a valid value.
Current conditions
Enter screen inputs to calculate.
PPI—Enter screen inputs to calculate.
- Physical width
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- Physical height
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- Pixel pitch
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The result uses the nominal diagonal and input resolution; the physical panel frame, rounded corners, and system scaling are not included in the physical size.
Screen size and pixel density
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Use and interpret
Enter the nominal diagonal, unit, horizontal resolution, and vertical resolution, or choose a preset. The result gives physical width, physical height, PPI, and pixel pitch.
Method and validation
Convert the diagonal to inches. Pixel diagonal is √(Wpx² + Hpx²); PPI = pixel diagonal ÷ diagonal in inches. Physical width and height follow the resolution proportions, and pixel pitch = 25.4 ÷ PPI millimetres.
Diagonal must be 0.1–500 and each resolution must be 1–20,000. The preset only fills the inputs; it does not identify the actual panel specification.
Scope and limitations
This is a nominal geometry calculation. It assumes square pixels and uses the stated diagonal and resolution; bezels, rounded corners, cut-outs, panel overscan, and measurement error are not included.
What does PPI mean?
PPI is pixels per inch: the diagonal pixel count divided by the physical diagonal in inches.
How is pixel pitch calculated?
Under the square-pixel assumption, pixel pitch is 25.4 ÷ PPI in millimetres.
Does this measure the physical panel?
No. It calculates from the diagonal and resolution you enter; it does not read the panel, EDID, or a ruler measurement.
Privacy and implementation
This tool runs in the browser. It does not upload input, call a remote API, or write to local storage.
The page uses standalone HTML, CSS, and JavaScript without a third-party runtime library.