What is the Screen Size Calculator?
Estimate the physical dimensions of a rectangular display from its pixel resolution and diagonal measurement.
The pixel aspect ratio determines how the stated diagonal divides into physical width and height.
Formula and calculation method
physical width = diagonal × pixels wide ÷ √(width² + height²); height uses the same scale.
The calculation runs locally in your browser and uses only the values entered on this page.
Important limitations
Technology estimates simplify real systems. Hardware, software, network conditions, measurement conventions and manufacturer behavior can change actual results.
Planning scope: Use the result as an estimate and confirm critical sizing or configuration with current product documentation.
Screen Size Calculator FAQs
No. The result estimates the active rectangular display area.
Nominal diagonal size, rounded corners and measurement practices can cause small differences.
Not alone; diagonal size is also required.
No. Results are educational estimates based only on the values and simplifying assumptions entered.
Yes. A displayed result is hidden as soon as an input changes so an old answer is not mistaken for a current calculation.
Yes. The form, colorful result panel and calculation steps are responsive for phones, tablets and desktops.
Sources and methodology
Official source links support terminology and measurement context. The arithmetic runs locally in your browser.