A4 paper size measures 210 mm by 297 mm (21 cm x 29.7 cm), which is equivalent to 8.3 inches by 11.7 inches
. It belongs to the ISO 216 A series of paper sizes and has an aspect ratio of 1:√2 (approximately 1:1.414)
. This size is widely used internationally for printing documents, school projects, legal papers, and business correspondence
. To summarize key dimensions:
- Width: 210 mm (8.3 inches)
- Height: 297 mm (11.7 inches)
- Aspect ratio: 1:1.414
- Area: approximately 62,370 mm² or 96.7 square inches
A4 is half the size of A3 and twice the size of A5 in the A series hierarchy
. It is the most common paper size used globally except in the US and Canada, where Letter size is more common
. Thus, A4 paper is a standard sheet measuring 210 x 297 mm, widely used for everyday printing and official documents
