Yarn Weight Conversions

Yarn weights in the United Kingdom are different to the United States which can be a little confusing now patterns are freely available online!  I thought it would be incredibly useful to write a little conversion table for yarn weights which can be referred to again and again.

If you are substituting yarns, it’s always best to do a tension swatch before knitting up that hand-dyed cashmere just to be sure you have substituted correctly!

US Yarn Weight UK Yarn Weight
thread, cobweb, lace weight, 1-2 ply
fingering weight, sock yarn, baby yarn 3-4 ply
sport weight, baby yarn 4 ply
light worsted weight, dk, 8 ply
worsted weight, afghan aran, 10 ply
bulky, rug, chunky, 12 ply
roving, super bulky super chunky
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