A4 paper size
A4 Paper Size: 210 × 297 mm, with inch and cm dimensions. Check proportions and common uses. Find the largest square for a paper craft.
- Millimetres
- 210 × 297 mm
- Centimetres
- 21 × 29.7 cm
- Inches · rounded to 4 decimals
- 8.2677 × 11.6929 in
- Aspect ratio · width:height
- 70:99 (1:1.414)
Common uses
A4 is used for letters, schoolwork, office printing and instruction sheets. Ordinary uncoated printer paper also makes a useful first folding sheet.
How it compares
Two A4 sheets placed side by side make approximately one A3 sheet. Cut A4 across the middle of its long edge to get two A5 sheets. Whole-millimetre rounding can leave a 1 mm difference at a cut edge.
Cut a square for origami
The largest square from a flat rectangle this size is 210 × 210 mm (8.2677 × 8.2677 in). Fold one short edge against a long edge so their corners meet. Crease the diagonal, cut off the extra 87 mm strip, then open the triangle.
Try the beginner origami dog with your square, or see how to prepare square paper.