Postcard sizes
Postcard Sizes: compare 2 formats and switch chart units. Dimensions in mm and inches. Sheet proportions, common uses and square-paper sizes.
- Millimetres
- 107.95 × 152.4 mm
- Centimetres
- 10.795 × 15.24 cm
- Inches · rounded to 4 decimals
- 4.25 × 6 in
- Aspect ratio · width:height
- 17:24 (1:1.412)
Common uses
Use a postcard for a short message, a small art print or an invitation. A 4 × 6 inch photo is slightly narrower than the 4.25 × 6 inch format shown here.
How it compares
Index card 4x6 is smaller in area. A6 greeting card is larger in area. These formats have their own proportions; halving a sheet does not necessarily produce the next size.
Sizes in this family
| Size | Dimensions |
|---|---|
| Postcard (4.25 × 6 in) | 107.95 × 152.4 mm4.25 × 6 in |
| Postcard (3.5 × 5 in) | 88.9 × 127 mm3.5 × 5 in |
Cut a square for origami
The largest square from a flat rectangle this size is 107.95 × 107.95 mm (4.25 × 4.25 in). Fold one short edge against a long edge so their corners meet. Crease the diagonal, cut off the extra 44.45 mm strip, then open the triangle.
For origami, use thin uncoated paper with these dimensions instead of thick or coated stock. Try the beginner origami dog with your square, or see how to prepare square paper.