Monitor calibration reference

LG 27UK850-W 27-inch 4K screen PPI

This monitor reference combines its 3840 × 2160 display, 27-inch diagonal, and estimated 163 PPI to give you a faster starting point for online-ruler calibration.

Open the ruler with a 27-inch estimate

Resolution

3840 × 2160

Screen diagonal

27"

Estimated PPI

163

How this LG 27UK850-W 27-inch 4K reference works

The reference combines this display’s 3840 × 2160 resolution with its 27-inch diagonal. PPI is the diagonal pixel count divided by the physical diagonal: sqrt(width² + height²) / diagonal inches. The 163 PPI figure is a rounded hardware-display specification, useful as a starting estimate rather than a browser measurement.

Browser CSS pixels, operating-system scaling, and browser zoom can all differ from the panel’s hardware pixels. That is why a screen specification cannot by itself guarantee a physical on-screen inch.

Calibrate on this monitor

Make sure this is the active display and that browser zoom is 100%. Resolution modes and operating-system display scaling make a physical-reference check essential.

Start with the 27-inch estimate, then compare the on-screen card guide with a physical standard card before relying on the ruler for a measurement. Recalibrate after changing zoom, display scaling, or the active screen.

Read the calibration guide or calculate PPI manually.

Related monitor PPI references

Compare similar displays when checking whether a saved calibration estimate is still appropriate for the screen in use.