iPad Pro 13インチ(M4) Ruler
Actual size, on screen

What fits on the iPad Pro 13インチ(M4) screen – and what doesn't

• Letter paper (short side)215.9 mm / 8.50 infits in one go (48.9 mm to spare)
• A4 paper (short side)210 mm / 8.27 infits in one go (54.8 mm to spare)
• a new pencil190 mm / 7.48 infits in one go (74.8 mm to spare)
• Letter paper (long side)279.4 mm / 11.00 in14.6 mm too long – measure in 2 passes
• A4 paper (long side)297 mm / 11.69 in32.2 mm too long – measure in 2 passes
• Legal paper (long side)355.6 mm / 14.00 in90.8 mm too long – measure in 2 passes

The iPad Pro 13インチ(M4) screen in numbers

• The screen is 264.8 mm (10.42 in) tall – 10.9 quarters laid end to end
• 3.09 times the long side of a credit card (85.6 mm)
• There are 104 physical pixels in every centimetre, 264 in every inch
• The finest 1 mm tick is 10.4 pixels apart

Compared with nearby models

Screen height compared with the iPad Pro 13インチ(M4) (198.6 × 264.8 mm).

• iPad Air 11インチ(M2)2024 · 160.5 × 229.8 mm35.0 mm shorter
• iPad Pro 11インチ(M4)2024 · 160.5 × 232.8 mm31.9 mm shorter
• iPad mini(第7世代)2024 · 115.9 × 176.6 mm88.2 mm shorter
• iPad(第11世代)2025 · 157.8 × 227.1 mm37.7 mm shorter

Models with the exact same scale

• iPad Air 13インチ(M2)

How this ruler stays true to size

The iPad Pro 13インチ(M4) packs 264 pixels into every inch and draws 2 physical pixels per CSS pixel, so one millimetre is 5.20 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.