Knitting Needle + Crochet Hook Size Conversions

Metric (mm) + U.S. Knitting Needle Conversions

Metric Sizes (mm)	U.S. Sizes
2 mm	0
2.5 mm	1
2.75 mm	2
3 mm	2 1/2
3.25 mm	3
3.5 mm	4
3.75 mm	5
4 mm	6
4.5 mm	7
5 mm	8
5.5 mm	9
6 mm	10
6.5 mm	10 1/2
7 mm	-
7.5 mm	-
8 mm	11
9 mm	13
10 mm	15
12 mm	17
16 mm	19
19 mm	35
20 mm	36
25 mm	50

 

Mertic (mm) + U.S. Crochet Hook Conversions

Metric Sizes (mm)	U.S. Sizes
0.60 mm	14
0.75 mm	12
1 mm	10
1.25 mm	-
1.5 mm	6
1.75 mm	4
2 - 2.25 mm	B
2.75 mm	C
3.25 mm	D
3.5 mm	E
3.75 mm	F
4 mm	G
4.5 mm	G
5 mm	H
5.5 mm	I
6 mm	J
6.5 mm	10 1/2
7 mm	-
7.5 mm	-
8 mm	L
9 mm	M/N
10 mm	N/P
11 mm	P
12 mm	17
15 mm	P/Q
16 mm	Q
17.5 mm	R
19 mm	S
20 mm	36
25 mm	50
30 mm	T/X