Ruler for iPhone 12 Pro Max

0cm

Line the object up with 0 at the top edge, then drag on the scale.

17.3 mm

US7

UKN

EU54

Lay a ring that fits on the circle. Change the size until the circle just fills the inside of the band.

Ruler on iPhone 12 Pro Max, actual size

This page is set for the iPhone 12 Pro Max screen, which is 71.2 mm wide in portrait. The scale runs about 15.4 cm down the screen. Open it in Safari at the normal page zoom and it reads true straight away.

If you use Display Zoom, or the reading looks off, tap Check with a card and match any bank card (85.6 mm).

Ruler for your iPhone

Each page is set for that model's screen, so it is the right size the moment it opens.

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