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Decision fieldOpen accessKnitting Needle to Crochet Hook Size ChartGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessYarn Database EU Dyers and MakersEuropean UnionRemove
Decision fit
Primary jobLearn techniquesFind patterns & fitChoose materials
Also useful forNo additional job recordedNo additional job recordedNo additional job recorded
AreaYarnPatterns & fitYarn
Best forFinding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gaugeDigital pattern draftingFinding independent EU yarn or fibre dyers with off-Ravelry purchase routes
Know before usingA shared nominal diameter does not make a knitting needle and crochet hook interchangeable or predict equal gauge or fabric. The reference is not a physical measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, or project approval.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.It is one curator's intentionally selective, off-Ravelry-oriented database, inventories change, and paid supporters can receive rotating priority placement; verify availability, fibre claims, shipping, and terms directly.
Practical access
ForMakersBothMakers
Location or jurisdictionGlobalGlobalEuropean Union
AccessOpen accessFree downloadOpen access
FormatStitch AuthoritySoftwareDirectory
Source typeStitch AuthorityOpen-source projectCommunity database
Source and review
What the source establishesRechecked July 28, 2026. The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows, aligns hooks and needles only when their nominal millimetre value matches, and leaves missing rows or aliases unfilled.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 individually researched database offers free listings and sortable yarn, fibre, designer, editor, accessory, and location views; the EU page spans multiple countries and direct seller profiles.
Linked page reviewedJul 28, 2026Jul 21, 2026Jul 15, 2026
Next review dueJul 28, 2027Jan 17, 2027Jan 11, 2027
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