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 size US size
2.0mm  14  n/a
2.25mm 13 B/1
2.5mm 12 n/a
2.75mm n/a C/2
3.0mm 11  n/a
3.25mm 10 D/3
3.5mm 9 E/4
3.75mm n/a F/5
4.0mm 8  G/6
4.5mm 7 7
5.0mm 6 H/8
5.5mm 5 I/9
6.0mm 4 J/10
6.5mm  3  K/10.5
7.0mm 2 n/a
8.0mm 0 L/11
9.0mm 00 M/13
10.0mm 000 N/15