Crochet Hook Conversion Chart

U.S. METRIC
B/1
2.25mm
C/2
2.75mm
D/3
3.25mm
E/4
3.5mm
F/5
3.75mm
G/6
4mm
7
4.5mm
H/8
5mm
I/9
5.5mm
J/10
6mm
K/10½
6.5mm
L/11
8mm
M/13
9mm
N/15
10mm