Monitor calibration reference
Dell U2723QE 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.
Resolution
3840 × 2160
Screen diagonal
27"
Estimated PPI
163
How the PPI reference is calculated
PPI is the diagonal pixel count divided by the physical diagonal in inches: sqrt(width² + height²) / diagonal inches. The result is rounded to the nearest whole pixel per inch.
This value is a screen specification reference, not a promise that your browser will render one CSS inch at the same physical size.
Calibrate on this device
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.