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Decision fieldOpen accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemoveOpen accessControlled Tech Pack OrientationGlobalRemoveOpen accessFabric Mass Unit ConverterGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemove
Decision fit
Primary jobFind patterns & fitSource productionChoose materialsFind patterns & fit
AreaPatterns & fitProductionMaterialsPatterns & fit
Best forAuditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidenceUnderstanding what a tech pack must control before using a template or releasing workTranslating the same fabric mass-per-area result between metric and U.S. customary listingsSearching current and out-of-print sewing patterns
Know before usingThe record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review.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 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.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
ForApparel brandsApparel brandsBothMakers
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessOpen accessOpen accessOpen accessFree account
FormatStitch AuthorityStitch AuthorityStitch AuthorityCommunity
Source typeStitch AuthorityStitch AuthorityStitch AuthorityCommunity database
Source and review
What the source establishesThe guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments.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 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.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 reviewedJul 16, 2026Jul 16, 2026Jul 16, 2026Jul 21, 2026
Next review dueJul 16, 2027Jul 16, 2027Jul 16, 2027Jan 17, 2027
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