What size crochet hook or knitting needle for what ply yarn?

Published on September 9, 2026

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.

Image version of table (all information can be found in text for below)

Laceweight (1 ply)

Designed for use in advanced patterns only, this can be used to make lace garments and accessories.
1.5 – 2.25mm knitting needles
0.75 – 3mm crochet hook

Fingering (2 ply)

Also for use in advanced patterns only, this can be used to make lace garments and accessories.
1.25 – 3.5mm knitting needles
2 – 3.5mm crochet hook

Sport (5 ply)

Tricky to use, this is commonly reserved for use in complex, decorative accessories.
3.5 – 4.5mm knitting needles
2 – 3.5mm crochet hook

DK (8 ply)

Used to create warm garments, including hats, jumpers and cardigans.
4.5 – 5.5mm knitting needles
3.5 – 4.5mm crochet hook

Worsted (10 ply)

Creates snug winter clothing and accessories, such as hats, scarves and jumpers.
5.5 – 6.5mm knitting needles
5 – 6.5mm crochet hook

Bulky (12 ply)

Great for chunky mid-winter jumpers and cardigans designed to keep out the cold.
6.5 – 9mm knitting needles
6.5 – 9mm crochet hook

Super bulky (14 ply)

Ideal for creating heavyweight rugs or blankets.
9mm + knitting needles
9 - 14mm crochet hook

Your Guide to Yarn Weight

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