International Yarn Weight Conversion

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USA UK Australia Suggested needle (mm)
Laceweight 2ply 2ply 1.5–2.25 mm
Light Fingering 3ply 3ply 2.25— 3 mm
Fingering 4ply 4ply 2.25— 3.25 mm
Sport Light DK 5ply 3.25— 3.75 mm
DK/Light Worsted DK 8ply 3.75— 4.5 mm
Worsted No equivalent, suggest Aran   4.5— 5.5 mm
Aran Aran   4.5— 5.5 mm
Bulky Chunky 12 ply 5.5— 8 mm
Super Bulky Super Chunky   8 mm and up

source: wikipedia

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