Screen Resolution & PPI Calculator
View browser-reported screen values and estimate PPI from physical size.
Browser values and physical-size estimate
Automatic values are browser-reported and may not match the panel hardware.
What this page helps you test
This focused browser tool also answers searches such as: screen resolution ppi calculator · screen resolution dpi calculator · screen size ppi calculator.
Guides for this tool
See how this check fits into real troubleshooting workflows.
If the result is not what you expected
Keep the tab visible
Browser timing tests discard or pause samples while this page is hidden.
Use native mode
Check display resolution, refresh setting, HDR, and scaling in system settings.
Reduce background load
Close animation-heavy tabs and overlays before repeating timing tests.
How it works
- Review screen CSS size, viewport, devicePixelRatio, and orientation reported by the browser.
- Enter a known pixel resolution and physical diagonal size.
- Calculate estimated PPI and pixel pitch with the visible formula.
What this result cannot prove
- Browsers may hide or scale the physical resolution; automatic values are browser-reported.
- PPI is only meaningful when the entered pixel dimensions and physical diagonal are accurate.
Related tools
Frequently asked questions
Is the Screen Resolution & PPI Calculator private?
Yes. Test input is processed in this tab and is not uploaded by this tool.
Why can browser results differ from another app?
Browsers, operating systems, permissions, device routing, and background load can all change what is exposed and measured.