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Crochet Hook Conversion Chart

Compare US, UK, and Canadian Crochet Hook Sizes at a Glance

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