Needle and Hook Conversion Chart

Metric sizes (mm) US sizes UK/Canadian US Crochet 
2.0 0 14  
2.25 1 13 B/1
2.75 2 12 C/2
3.0 - 11  -
3.25 3 10 D/3
3.5 4 - E/4
3.75 5 9 F/5
4.0 6 8 G/6
4.5 7 7  7
5.0 8 6 H/8
5.5 9 5 I/9
6.0 10 4 J/10
6.5 10.5 3 K/10.5
7.0 - 2  -
7.5 - 1  -
8.0 11 0 L/11
9.0 13 00  M/13
10.0 15 000  N/15
12.0 17 -  -
16.0 19 -  -
19.0 35 -  -
25.0 50 -  -