Phone calibration reference

iPhone SE (3rd generation) screen PPI

This phone reference combines its 1334 × 750 display, 4.7-inch diagonal, and estimated 326 PPI to give you a faster starting point for online-ruler calibration.

Open the ruler with a 4.7-inch estimate

Resolution

1334 × 750

Screen diagonal

4.7"

Estimated PPI

326

How this iPhone SE (3rd generation) reference works

The reference combines this display’s 1334 × 750 resolution with its 4.7-inch diagonal. PPI is the diagonal pixel count divided by the physical diagonal: sqrt(width² + height²) / diagonal inches. The 326 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 phone

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.

Start with the 4.7-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 phone PPI references

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