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Decision fieldOpen accessSeam Allowance ConverterGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessFabric Mass Unit ConverterGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitChoose materials
AreaPatterns & fitPatterns & fitMaterials
Best forWorking between pattern systemsSearching current and out-of-print sewing patternsTranslating the same fabric mass-per-area result between metric and U.S. customary listings
Know before usingA unit reference; the correct allowance depends on material, seam type, and production method.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.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
ForBothMakersBoth
Location or jurisdictionGlobalGlobalGlobal
AccessOpen accessFree accountOpen access
FormatStitch AuthorityCommunityStitch Authority
Source typeStitch AuthorityCommunity databaseStitch Authority
Source and review
What the source establishesThe 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.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 reviewedJul 15, 2026Jul 21, 2026Jul 16, 2026
Next review dueJul 15, 2027Jan 17, 2027Jul 16, 2027
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