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| Decision field | Open accessFabric Mass Unit ConverterGlobalRemove | Free downloadSeamly2DGlobalRemove | Open accessPattern Test Brief TemplateGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Choose materials | Find patterns & fit | Find patterns & fit | Find patterns & fit |
| Area | Materials | Patterns & fit | Patterns & fit | Patterns & fit |
| Best for | Translating the same fabric mass-per-area result between metric and U.S. customary listings | Digital pattern drafting | Planning a sewing, knitting, or crochet pattern test | Searching current and out-of-print sewing patterns |
| Know before using | 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. | 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 workflow is not a contract or quality certification; local legal duties and technical review may still apply. | Community members add and quality-control the records, so confirm sizing, measurements, fabric suggestions, format, availability, errata, license, and purchase terms with the designer or publisher. Adding an entry to a stash does not provide the pattern files. Saved searches and private PDF storage are paid Plus features, and a listing or review does not establish pattern accuracy or fit. |
| Practical access | ||||
| For | Both | Both | Both | Makers |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Open access | Free download | Open access | Free account |
| Format | Stitch Authority | Software | Stitch Authority | Community |
| Source type | Stitch Authority | Open-source project | Stitch Authority | Community database |
| Source and review | ||||
| What the source establishes | 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. | 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 linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface. | Threadloop's official guide describes an independent, fully crowdsourced database covering available and out-of-print sewing patterns. Its search supports pattern type, fabric type, age group, body type, cup size, level, format, file features, language, measurements, availability, and other filters; members can also track a stash, wishlist, projects, reviews, and discussions. |
| Linked page reviewed | Jul 16, 2026 | Jul 21, 2026 | Jul 15, 2026 | Jul 21, 2026 |
| Next review due | Jul 16, 2027 | Jan 17, 2027 | Jul 15, 2027 | Jan 17, 2027 |
| Inspect | ||||
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