Origami With A4 Sized Paper. This simple calculator will work out the size you should trim your paper to if a4 size paper is required for the origami model. When choosing origami paper there are some key considerations to keep in mind that will help you get started and keep up your practice.

For example, if the tutorial used a4 paper (21cm x 29.7cm), enter 21 and 29.7 into the fields. A letter size rectangle 85 x 11 inches or an a4 piece of paper. Compared to an 8.5″ x 11″ (letter size) paper, the a4 is a little more skinny and a little longer.