Origami Paper Size Calculator
Calculate the paper square size required for origami models based on your desired finished size.
| Model | Ratio | Paper weight | Notes |
|---|---|---|---|
| Crane | 2.5× | 60–80 gsm | Standard kami paper works perfectly |
| Masu box | 4× (depth) | 80–120 gsm | Paper size = depth × 4 for a snug lid; use sturdy paper |
| Lotus flower | 2.8× | 60–80 gsm | Foil-backed paper holds petals better |
| Boat / Sailboat | 2.0× | 60–90 gsm | Simple fold; works with almost any paper |
| Jumping frog | 2.2× | 70–90 gsm | Stiffer paper makes better jumpers |
| Butterfly | 2.4× | 60–80 gsm | Thin paper gives more delicate wing shape |
| Modular (Sonobe) | 1.5× (unit) | 60–80 gsm | Each unit from a square; 12 units = small ball |
| 6-point star | 3.0× | 80–120 gsm | Stiffer paper holds star points crisply |
Choosing Paper for Origami
Standard origami paper (kami) is 60–80 gsm, thin enough to fold cleanly without bulk buildup, but strong enough for complex models. For complex models with many layers (like modular or advanced geometric origami), use paper at the lower end (50–65 gsm) to prevent the layers from becoming too thick to crease. For display models that need to hold their shape, slightly heavier paper (80–100 gsm) or foil-backed paper is ideal.
The Masu Box Special Case
The traditional masu box ratio is calculated from the desired interior depth, not the overall box width. A paper square of 4× the depth produces a box where the width equals the depth — a perfect cube. To make a lid that fits over the box, use a paper square that is 4× depth + 1–2 cm larger than the base paper. For example, if the base uses a 20 cm square, make the lid from a 21–22 cm square.
Modular Origami
Modular origami builds three-dimensional structures from identical units (modules) slotted together without glue. The Sonobe unit is the most popular — 12 units make a cube, 30 units make a large ball or icosahedron, 90 units make an even larger sphere. Each unit is folded from a square cut to approximately 1/4 of the original sheet size, so plan accordingly for large assemblies.