Crochet Hook Sizes: An international size conversion chart

By Tracey Van Loggerenberg

We live in a global world where that stunning pattern you’ve just picked up calls for a ‘G’ hook, and you’ve never heard of that before. Working out what size crochet hook you need for your pattern can be confusing, but we’ve put together this chart to help you get started on crocheting instead of googling. If you’re curious how these different sizing systems came about, we have an interesting tale to tell.

Metric	USA	UK
Crochet Hook Conversion Chart
2.00 mm	-	14
2.25 mm	1 / B	13
2.50 mm	-	12
2.75 mm	C	11
3.00 mm	-	11
3.25 mm	D	10
3.50 mm	4 / E	9
3.75 mm	F	-
4.00 mm	6	8
4.25 mm	G	-
4.50 mm	7	7
5.00 mm	8 / H	6
5.50 mm	9 / I	5
6.00 mm	10 / J	4
6.50 mm	10 1/2 / K	3
7.00 mm	-	2
8.00 mm	-	0
9.00 mm	15 / N	00
10.00 mm	P	000
15.75 mm or 16mm	Q	-

Metric	USA	UK
Steel Hook Chart (thread hooks)
.6 mm	14	6
.75 mm	13	-
.70 mm	12	5
.8 mm	11	-
1 mm	10	4
1.15 mm	9	-
1.25 mm	8	3
1.50 mm	7	2.5
1.6 mm	6	-
1.7 mm	5	-
1.75 mm	4	2
1.85 mm	3	-
1.95 mm	2	-
2 mm	1	1
2.25 mm	0	00
3 mm	00	-

These conversions are approximate.

About the author

Tracey Van Loggerenberg

Tracey is an accredited Knitting For All teacher based in Kintore, Aberdeenshire. When she’s not running classes or workshops locally, she’s out running trails or spinning yarn.

She’s been crafting for over 40 years. Crafting runs in the family, having learnt from her mum and grandma. Learning new crafts and passing on that knowledge is her mission. If it’s fibre related, she’ll most likely have tried her hand at it. She’s passionate about preserving crafts for future generations. She enjoys teaching the following: knitting, crocheting, weaving, nålbinding, and macramé, but this list is not exhaustive.

She believes crafting is beneficial for both our mental health and physical well-being, so it brings her great joy to share her love of the fibre arts with a wider audience.