Hook Size Information

[AmyS]

Yarn Hook Sizes

US Size Range*........Millimeter Range
B-1........................2.25 mm
C-2........................2.75 mm
D-3........................3.25 mm
E-4........................3.5 mm
F-5........................3.75 mm
G-6........................4 mm
7...........................4.5 mm
H-8........................5 mm
I-9.........................5.5 mm
J-10.......................6 mm
K-10.5....................6.5 mm
L-11.......................8 mm
M/N-13...................9 mm
N/P-15...................10 mm
P/Q........................15 mm
Q...........................16 mm
S...........................19 mm

*Letter or number may vary by manufacturer. Please rely on mm sizing for best accuracy.

Steel Hook Sizes

Steel crochet hooks are used most often with crochet threads and lace/fingering weight yarns. Steel hooks use a different sizing system: the higher the hook number, the smaller the hook (reverse of system for yarn hook sizing).

00 (3.5 mm)
0 (3.25 mm)
1 (2.75 mm)
2 (2.25 mm)
3 (2.1 mm)
4 (2.0 mm)
5 (1.9 mm)
6 (1.8 mm)
7 (1.65 mm)
8 (1.5 mm)
9 (1.4 mm)
10 (1.3 mm)
11 (1.1 mm)
12 (1.0 mm)
13 (0.85 mm)
14 (0.75 mm)