A6 from a 6" Square

Some origami models, especially modular origami, use A5 or A6 paper instead of a 6" square sheet of paper. For those in USA and Canada, A-series papers are hard to come by. Fear not: you can easily change a 6" square to an A6 proportioned paper. Or, you can make two A5 from a US Letter.

A6 from a 6" Square Instructions

1. Start with a 6" square sheet of paper. Fold and unfold the paper in half to get a diagonal crease.

2. Bisect the left side of the paper. Fold so the left-edge of the paper aligns with the crease made is step 1.

3. Note where the bottom-left corner is now located. Make a pinch fold here and then cut off a strip of paper off the long edge of the paper (the strip will be approx 1¾" wide).

4. The resulting rectangle is A proportioned (4.24" x 6"). It is a little bigger than an A6 (4.13" × 5.83") but it is the closest you can get when starting with a 6" square. If you cut this piece of paper in half crosswise, the two smaller pieces of paper will be equivalent to A7 paper. The A-series papers are special "silver rectangles" and have the unique feature of being cut in half and still retain the 1 to √2 ratio. Read about gold, silver, and bronze rectangles here.