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What Size Crochet Hook or Knitting Needle for what Ply Yarn?

The Complete Guide to using the right sized Crochet Hook or Knitting Needle with the right Weight Yarn

 If you like to be a little creative with projects it helps to know what weight yarns equal to what plys and what knitting needles and crochet hooks can be used with what, so we have created this handy chart to help you chose the right fit every time.

So, whether you're comparing UK yarn terms to US yarn terms or looking for a guide on what crochet hook size is suitable for a 4-ply yarn, simply refer to the table below. 

Please note, this table has been created as a guide, always refer to the pattern or yarn in question. We would also recommend testing gauge and tension with a tension swatch. 

Yarn Weight UK Yarn Weight US Yarn Weight AU  Pattern Recommendations Needle Size  Crochet Hook Size
1 ply  Laceweight  2 ply  Designed for use in advanced patterns only, this can be used to make lace garments and accessories 1.5 – 2.25mm 0.75 – 3mm
2 ply  Fingering 3 ply  Also for use in advanced patterns only, this can be used to make lace garments and accessories 1.25 – 3.5mm 2 – 3.5mm
4 ply  Sport  5 ply 
Tricky to use, this is commonly reserved for use in complex, decorative accessories
3.5 – 4.5mm 2 – 3.5mm
DK DK 8 ply Used to create warm garments, including hats, jumpers and cardigans 4.5 – 5.5mm 3.5 – 4.5mm
Aran  Worsted  10 ply  Creates snug winter clothing and accessories, such as hats, scarves and jumpers 5.5 – 6.5mm 5 – 6.5mm
Chunky  Bulky 12 ply  Great for chunky mid-winter jumpers and cardigans designed to keep out the cold 6.5 – 9mm 6.5 – 9mm
Super Chunky  Super Bulky 14 ply  Ideal for creating heavyweight rugs or blankets 9mm + 9 - 14mm