Crochet hook size conversion chart

Watching YouTube, you’ll find different terminology for crochet hook sizes. Here’s a handy conversion chart for such times.

Metric size (mm)UK/Canadian sizeUS size
2.0mm 14 n/a
2.25mm13B/1
2.5mm12n/a
2.75mmn/aC/2
3.0mm11 n/a
3.25mm10D/3
3.5mm9E/4
3.75mmn/aF/5
4.0mm8 G/6
4.5mm77
5.0mm6H/8
5.5mm5I/9
6.0mm4J/10
6.5mm 3 K/10.5
7.0mm2n/a
8.0mm0L/11
9.0mm00M/13
10.0mm000N/15