iPhone SE(第3世代) Ruler
Actual size, on screen

What fits on the iPhone SE(第3世代) screen – and what doesn't

• a 4×6 photo (short side)101.6 mm / 4.00 infits in one go (2.3 mm to spare)
• a playing card (long side)88.9 mm / 3.50 infits in one go (15.0 mm to spare)
• a credit card (long side)85.6 mm / 3.37 infits in one go (18.3 mm to spare)
• an index card (long side, 3×5)127 mm / 5.00 in23.1 mm too long – measure in 2 passes
• a CD case (long side)142 mm / 5.59 in38.1 mm too long – measure in 2 passes
• a 4×6 photo (long side)152.4 mm / 6.00 in48.5 mm too long – measure in 2 passes

The iPhone SE(第3世代) screen in numbers

• The screen is 103.9 mm (4.09 in) tall – 4.3 quarters laid end to end
• 1.21 times the long side of a credit card (85.6 mm)
• There are 128 physical pixels in every centimetre, 326 in every inch
• The finest 1 mm tick is 12.8 pixels apart

Compared with nearby models

Screen height compared with the iPhone SE(第3世代) (58.4 × 103.9 mm).

• iPhone 13 Pro2021 · 64.6 × 139.8 mm35.9 mm taller
• iPhone 13 Pro Max2021 · 71.2 × 154.1 mm50.1 mm taller
• iPhone 142022 · 64.6 × 139.8 mm35.9 mm taller
• iPhone 14 Plus2022 · 71.2 × 154.1 mm50.1 mm taller

Models with the exact same scale

• iPhone 6
• iPhone 6s
• iPhone 7
• iPhone 8
• iPhone SE(第2世代)

How this ruler stays true to size

The iPhone SE(第3世代) packs 326 pixels into every inch and draws 2 physical pixels per CSS pixel, so one millimetre is 6.42 CSS px. The ticks are rebuilt from that number and the live pixel ratio each time the page opens, which is why no calibration is needed on this model. The right side of the strip is metric (mm/cm) and the left side is inches in 1/16 steps; 1 inch = 25.4 mm.

If the ticks look off (display zoom or font-size settings change the ratio), hold a credit card against the screen – its long side is 85.6 mm – and use the card calibration. The calibration tool and the full device list are in Japanese, but the controls are simple: pick card or coin, drag to match. 日本語版はこちら.