Developer Tools
Pixel Density Calculator
Pixel Density Calculator is a browser-based calculator tool on CalcToolsBase. Free, browser-based Pixel Density Calculator. Enter your input for an instant, clearly-labelled result - no signup, no uploads. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
Pixel Density Calculator turns your horizontal resolution, vertical resolution and diagonal size into the pixel density in PPI using resolution and diagonal. The maths runs locally, so nothing you enter leaves the page.
Browser-side developer and utility helpers for everyday and learning use. Everything runs locally in your browser and nothing you enter is uploaded. Validate production or security-critical output with trusted, official tools before relying on it.
About this tool
Pixel Density Calculator exists to work out a screen’s pixel density with the least fuss. From your horizontal resolution, vertical resolution and diagonal size it derives the pixel density in PPI using resolution and diagonal, all on your device. There are no accounts, no adverts in the result, and nothing leaves your browser.
How to use
- Enter the horizontal resolution in pixels.
- Enter the vertical resolution in pixels.
- Enter the display diagonal in inches.
- Run the calculator to read the PPI.
Why use the Pixel Density Calculator
Instant
Each result is computed on your device the moment you run the tool.
Private
The text and numbers you enter stay in your browser and are never uploaded.
Free
No signup and no paywall to use any tool in this set.
Works offline
Once the page has loaded it keeps working on a weak or dropped connection.
Built for developers
Plain inputs and outputs you can copy straight into code, configs, or notes.
Honest by design
Conversions and heuristics are for everyday and learning use; verify security-critical output with trusted, official tools.
Common uses
Pixel Density when working out a screen's pixel density
Pixel Density when picking a phone or laptop by sharpness
Pixel Density for image and video resolution work
Pixel Density for everyday pixel-density reference
Pixel Density when comparing two displays' sharpness
Pixel Density when comparing pixel density across sizes
Technical notes
Pixel Density Calculator computes pixel density as PPI = √(width² + height²) in pixels ÷ the diagonal in inches.
Results are reference values; validate against your own environment before relying on them in production.
Nothing you type is uploaded — the calculation happens entirely on your device.
Worked example
A 6.1-inch phone at 2532 × 1170 has diagonal 2,789.25 px, so PPI = 457.25 ÷ ... ≈ 457.25 PPI.
FAQ
How is PPI calculated?
It takes the square root of the squared horizontal and vertical pixel counts to get the diagonal in pixels, then divides by the diagonal in inches.
What is dot pitch?
Dot pitch is the distance between pixels, here reported in millimetres, and a smaller value means a finer display.
Should resolution be whole pixels?
Yes. Pixel counts must be whole numbers, so the tool rejects fractional resolutions.
Does a bigger screen always mean lower PPI?
At the same resolution, yes; spreading the same pixels over a larger diagonal lowers the pixels per inch.