B4 paper size (ISO)
B4 Paper Size (ISO): 250 × 353 mm, with inch and cm dimensions. Check proportions and common uses. Find the largest square for a paper craft.
- Millimetres
- 250 × 353 mm
- Centimetres
- 25 × 35.3 cm
- Inches · rounded to 4 decimals
- 9.8425 × 13.8976 in
- Aspect ratio · width:height
- 250:353 (1:1.412)
Common uses
ISO B4 gives drawings and documents a little more room than A4. Do not confuse it with the larger JIS B4 format.
How it compares
Two B4 sheets placed side by side make approximately one B3 sheet. Cut B4 across the middle of its long edge to get two B5 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 250 × 250 mm (9.8425 × 9.8425 in). Fold one short edge against a long edge so their corners meet. Crease the diagonal, cut off the extra 103 mm strip, then open the triangle.
Try the beginner origami dog with your square, or see how to prepare square paper.