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Decision fieldFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessFabric Mass Unit ConverterGlobalRemoveOpen accessControlled Tech Pack OrientationGlobalRemoveOpen accessHook & Needle Diameter ReferenceGlobalRemove
Decision fit
Primary jobFind patterns & fitChoose materialsSource productionLearn techniques
AreaPatterns & fitMaterialsProductionYarn
Best forSearching current and out-of-print sewing patternsTranslating the same fabric mass-per-area result between metric and U.S. customary listingsUnderstanding what a tech pack must control before using a template or releasing workChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gauge
Know before usingCommunity 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.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.An orientation rather than a completed product record; it does not supply a universal format, licensed standard content, measurements, tolerances, construction settings, labels, approvals, compliance conclusion, or product-release authority.The reference is not a dimensional measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, gauge result, or proof that a proposed tool will produce the required fabric.
Practical access
ForMakersBothApparel brandsMakers
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessFree accountOpen accessOpen accessOpen access
FormatCommunityStitch AuthorityStitch AuthorityStitch Authority
Source typeCommunity databaseStitch AuthorityStitch AuthorityStitch Authority
Source and review
What the source establishesThreadloop'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.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 guide cites current ISO sources for documented-information, garment-measurement, stitch, and seam boundaries plus current U.S. FTC textile and care-labeling guidance; it explicitly separates those authorities from product-specific technical and market decisions.The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows and follows the Council's warning that company letter and number labels vary; blank aliases remain blank instead of being inferred.
Linked page reviewedJul 21, 2026Jul 16, 2026Jul 16, 2026Jul 16, 2026
Next review dueJan 17, 2027Jul 16, 2027Jul 16, 2027Jul 16, 2027
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