Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
Compute screen pixel density from resolution and diagonal size — compare phone sharpness honestly. A 1080p 6-inch display gives ~367 PPI — free, runs locally.
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.
Get any image or screen's aspect ratio in reduced form with common-ratio matching — 16:9, 4:3, 1:1 and custom. Check a 1920×1080 screen reads 16:9 — free, runs locally.
Convert between kW, hp, bhp, W, MW, and BTU/hr — engine specs, solar sizing, and HVAC math in one place. Size solar arrays and compare engine outputs correctly — free, local, no signup.
Convert paper sizes — A4, Letter, Legal — with millimeter and inch dimensions. Fit US Letter content onto A4 correctly — free, local, no signup.
About 163 PPI — crisp for desktop viewing distances. Compare against 24-inch 1440p (~122 PPI) when choosing monitors.
Inches measure diagonal physically; pixels measure detail. A 32-inch 1080p looks coarser than 24-inch 1440p despite bigger size.
Roughly 1.5–2.5× diagonal for 4K immersion. A 55-inch TV suits 7–11 feet; closer wastes pixels, farther wastes money.
No — math runs locally in your browser. Numbers never leave your device.
Aspect Ratio Calculator
Get any image or screen's aspect ratio in reduced form with common-ratio matching — 16:9, 4:3, 1:1 and custom. Check a 1920×1080 screen reads 16:9 — free, runs locally.
PPI Calculator
Compute screen pixel density from resolution and diagonal size — compare phone sharpness honestly. A 1080p 6-inch display gives ~367 PPI — free, runs locally.
Last updated October 2026