how big is a4 paper in cm

A4 paper is 21.0 cm wide and 29.7 cm tall when used in the usual portrait orientation.

Quick Scoop

• A4 size in cm: 21.0 cm × 29.7 cm.

• In millimetres, that is 210 mm × 297 mm.

• In inches, it is about 8.27 in × 11.69 in.

Extra Handy Notes

• Turning the sheet sideways (landscape) just swaps how you describe it: 29.7 cm × 21.0 cm.

• A4 is the standard everyday document size in most of the world and is exactly half of an A3 sheet.

Information gathered from public forums or data available on the internet and portrayed here.