A4 size in cm
A4 paper is 21 × 29.7 cm — that is 210 × 297 mm, or 8.27 × 11.69 inches.
21 cmwidth
29.7 cmheight
623.7 cm²area
A sizes in centimetres
| Size | Centimetres |
|---|---|
| A3 | 29.7 × 42 cm |
| A4 | 21 × 29.7 cm |
| A5 | 14.8 × 21 cm |
| A6 | 10.5 × 14.8 cm |
A4 next to US Letter
| Format | Centimetres | Difference |
|---|---|---|
| A4 | 21 × 29.7 cm | — |
| US Letter | 21.6 × 27.9 cm | 0.6 cm wider, 1.8 cm shorter |
A4 and US Letter are close enough to look identical but different enough to cause trouble: printing an A4 document on Letter paper crops about 1.8 cm from the bottom unless you scale it. If a document is going overseas, set the page size deliberately rather than relying on the printer default.
Frequently asked questions
What is A4 size in cm?
21 × 29.7 cm.
Is A4 21 by 30 cm?
Almost — the exact height is 29.7 cm, not 30 cm.
What is the difference between A4 and US Letter in cm?
US Letter (21.6 × 27.9 cm) is 0.6 cm wider and 1.8 cm shorter than A4.