Compute screen pixel density from resolution and diagonal size — compare phone sharpness honestly. A 1080p 6-inch display gives ~367 PPI — free, runs locally.
Content reviewed October 2026 · About Toolzum
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
Compute display DPI from pixel width, pixel height, and diagonal inches — diagonal pixels over diagonal size. Compare phone and laptop sharpness honestly — free, runs locally.
Compute test percentages and grades from correct/total with curve options. Turn 42/50 into 84% (B) instantly — free, local, no signup.
Compute cost per mille for ad campaigns — compare display, video, and social CPMs. Judge a $12 CPM against returns — free, local, no signup.
Generates a browser extension that captures browser tabs, full screens, or specific application windows with configurable resolution, frame rate. No signup or account required.
About 367 PPI — diagonal pixels (2203) divided by 6 inches. Above ~300 PPI individual pixels vanish at normal viewing distance.
Up to a point: beyond 400 PPI returns diminish while battery cost grows. Compare candidate phones here instead of trusting marketing numbers.
Resolution lives in display settings; diagonal size is the marketed inches (measure corner to corner). Enter both for the true density.
No — math runs locally in your browser. Nothing leaves your device.
DPI Calculator
Compute display DPI from pixel width, pixel height, and diagonal inches — diagonal pixels over diagonal size. Compare phone and laptop sharpness honestly — free, runs locally.
Screen Size Calculator
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.