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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessFabric Mass Unit ConverterGlobalRemove |
|---|---|---|
| Decision fit | ||
| Primary job | Find patterns & fit | Choose materials |
| Area | Patterns & fit | Materials |
| Best for | Digital pattern drafting | Translating the same fabric mass-per-area result between metric and U.S. customary listings |
| Know before using | Patternmaking knowledge, controlled measurement files, production conventions, and sewn fit testing are still required. The software does not validate body measurements, ease, balance, grading rules, fabric behavior, construction, or product fit. The project currently labels its user wiki manual as needing updates, so confirm current commands and file behavior against the installed release and active support channels. | The result is a numerical unit conversion, not a new measurement or conformance decision; it does not establish sample or lot representativeness, significant digits, drape, warmth, opacity, thickness, stretch, strength, shrinkage, durability, sewability, end use, target, or tolerance. |
| Practical access | ||
| For | Both | Both |
| Location or jurisdiction | Global | Global |
| Access | Free download | Open access |
| Format | Software | Stitch Authority |
| Source type | Open-source project | Stitch Authority |
| Source and review | ||
| What the source establishes | The maintained Seamly2D repository identifies the application as GPLv3+ open-source patternmaking software for Windows, macOS, and Linux. It reads multi-size measurement files for standardized sizes and individual measurement files for custom-fit work, publishes downloadable builds and releases, and links an active website and user forum. | The calculator uses the NIST SP 811 Appendix B.8 conversion from avoirdupois ounces per square yard to kilograms per square metre and links to a source-reviewed fabric mass record for method, sampling, conditioning, and product controls. |
| Linked page reviewed | Jul 21, 2026 | Jul 16, 2026 |
| Next review due | Jan 17, 2027 | Jul 16, 2027 |
| Inspect | ||
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