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Decision fieldFree downloadSeamly2DGlobalRemoveOpen accessPattern Test Brief TemplateGlobalRemoveOpen accessFabric Mass Unit ConverterGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitChoose materials
AreaPatterns & fitPatterns & fitMaterials
Best forDigital pattern draftingPlanning a sewing, knitting, or crochet pattern testTranslating the same fabric mass-per-area result between metric and U.S. customary listings
Know before usingPatternmaking 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.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
ForBothBothBoth
Location or jurisdictionGlobalGlobalGlobal
AccessFree downloadOpen accessOpen access
FormatSoftwareStitch AuthorityStitch Authority
Source typeOpen-source projectStitch AuthorityStitch Authority
Source and review
What the source establishesThe 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.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 21, 2026Jul 15, 2026Jul 16, 2026
Next review dueJan 17, 2027Jul 15, 2027Jul 16, 2027
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