📄 Origami Paper Size Calculator

An origami model's finished size scales roughly proportionally with the starting paper size. This calculator uses finished size ÷ ratio = required paper side length. For example, if you want a crane with an 11cm wingspan and the crane's ratio is 0.55, the required square paper side is 11 ÷ 0.55 = 20cm.


These ratios are not an exact geometric law — they are approximate figures commonly cited within origami-hobbyist references for typical traditional diagrams. Actual results vary by paper thickness, fold precision/tightness, and the specific diagram/variant used, so treat them as a starting estimate and adjust based on a test fold.

Most origami models are measured against a square paper side, but the 5-point lucky star is typically folded and knotted from a long, narrow paper strip instead of a square. Its "size" usually refers to the point-to-point diameter of the finished star, which is roughly 1/8 of the strip length used. So when you select the lucky star preset, the calculated "required paper size" should be read as the required strip length, not a square side. For example, to get a 3cm-diameter star, you'd need a strip roughly 3 ÷ 0.12 = 25cm long.