Laptop calibration reference
MacBook Air 15-inch (M3) screen PPI
This laptop reference combines its 2880 × 1864 display, 15.3-inch diagonal, and estimated 224 PPI to give you a faster starting point for online-ruler calibration.
Resolution
2880 × 1864
Screen diagonal
15.3"
Estimated PPI
224
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
External displays, browser zoom, and operating-system scaling can change the effective scale. Treat this as a starting estimate, then confirm with a physical card on the active display.