Phone calibration reference
iPhone 16 screen PPI
This phone reference combines its 2556 × 1179 display, 6.1-inch diagonal, and estimated 460 PPI to give you a faster starting point for online-ruler calibration.
Resolution
2556 × 1179
Screen diagonal
6.1"
Estimated PPI
460
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
Use the ruler in the device’s browser at its default zoom. A card calibration is the most reliable final check because mobile browser chrome and display settings can affect the rendered scale.