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Crochet hooks, like knitting needles, come in lots of different sizes and are often made of different materials. Larger hooks are usually plastic but it is possible to buy ones made from bamboo—many people find this type particularly easy and comfortable to work with. Smaller hooks are usually metal, although some may consist of a metal hook and shank encased in a plastic handle.

The size of the hook used determines the size of the stitches being made, and it is also usually governed by the thickness of the yarn. Thick yarns are usually worked using a chunky hook, while fine yarns generally require a small hook.

Nowadays crochet hook sizes are generally given in a metric size—but if you have old hooks, carrying an older imperial measurement, you need to know what the metric equivalent is.

CROCHET HOOK CONVERSION CHART
Metric	Old UK	USA
2.00 mm	14	B/1
2.25 mm	13	B/1
2.50 mm	12	C/2
3.00 mm	11	D/3
3.25 mm	10	D/3
3.50 mm	9	E/4
3.75 mm	–	F/5
4.00 mm	8	G/6
4.50 mm	7	7
5.00 mm	6	H/8
5.50 mm	5	I/9
6.00 mm	4	J/10
6.50 mm	3	K/10½
7.00 mm	2	–
8.00 mm	0	L/11
9.00 mm	00	M/13
10.00 mm	000	N/15

º If more than one hook size is used for the item, it is important to adjust the size of these other hooks accordingly, too.

º When making the slip knot, ensure that the end of the yarn that tightens the loop is the cut end of yarn, not the end leading to the ball—this will mean that the slip knot can be pulled up tighter later to neaten the work.

º When working any crochet stitch, the yarn should always be wrapped around the hook in the same way—over, around, and under.