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Origami Paper Size Calculator
Calculate the starting square paper size needed for a finished origami model, using per-design fold ratios plus standard Kami pack size and GSM weight recommendations.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Required Square Paper Size
Nearest Standard Kami Pack
Standard Japanese commercial sizes
Recommended Paper Weight (GSM)
Standard Japanese Origami Paper (Kami) Size Standards
| Standard Kami Size | Metric (cm) | Imperial (inches) | Best Suited Models |
|---|
How it works
- Select a traditional or complex origami model preset (Crane, Frog, Masu Box, Kawasaki Rose, or Dragon).
- Enter your desired finished model dimension (wingspan, length, base width) in cm, inches, or mm.
- The calculator applies geometric fold ratios to determine the exact square sheet size required.
- Review the nearest standard commercial Japanese Kami pack size and recommended paper weight (GSM).
The formula
Starting Square Side = Desired Finished Dimension / Model Scaling Ratio
FAQ
How do origami paper-to-model scaling ratios work?
Every origami design compacts paper differently. For example, a traditional crane has a finished wingspan approximately 50% the side length of the starting square (a 20 cm square yields a 10 cm wingspan crane). High-complexity models (like dragons) can shrink paper down to 20%–25% of the original square.
What is GSM in origami paper selection?
GSM (Grams per Square Meter) measures paper thickness. Standard Kami paper is 60–70 GSM (ideal for 15–30 step models). Complex models with dozens of overlapping layers require ultra-thin 30–45 GSM tissue foil or double unryu to prevent tearing and bulk.
What are standard Japanese Kami paper pack dimensions?
Standard commercial origami squares are 7.5 × 7.5 cm (3" mini), 15 × 15 cm (5.9" standard), 20 × 20 cm (7.9" large), 24 × 24 cm (9.4"), and 35 × 35 cm (13.8" complex master size).
Why should heavier paper (Tant) be used for boxes and containers?
Models that require rigid structural strength (like Masu boxes or geometric modular polyhedra) benefit from 80–120 GSM Tant or cardstock rather than thin Kami.
How we compare
| Feature | Online Tool Store | Origami diagram books | Trial and error cutting |
|---|---|---|---|
| Automatic square sheet sizing from finished target | ✓ | Fixed sizes only | ✗ (Wasted paper) |
| Standard Japanese Kami commercial pack matching | ✓ | Partial | ✗ |
| Paper weight (GSM) & tissue foil recommendations | ✓ | ✓ | ✗ |